Space Station Acronyms - Full List
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2FT	two-failure tolerance
3D	three dimensional
A&C	activation and checkout
A&COTA	assembly and checkout technical analysis
A&EM	assembly and external maintenance
A&I	assembly and installation
A&MI	assembly and maintenance integration
A&MV	assembly and maintenance verification
A&R	automation and robotics
A&S	avionics and software
A/G	air-to-ground
A/V	audio/video
AACS	Attitude & Articulation Control Subsystem
AADC	Avionics Architecture Design Change
AAMP	Advanced Automation Methodology Project
AAP	airlock adapter plate (shuttle)
AB	array bending
AC	alternating current
AC	assembly complete
AC	AWP control
AC&S	attitude control and stabilization

AC/SIA	AWP control/Space Station initialization assembly
AC/SIP	AWP control/Space Station initialization panel
ACA	Associate Contractor Agreement
ACA	attitude control assembly
ACBS	assembly contingency baseboard signal
ACBSP	assembly contingency baseband signal processor
ACC	aft cargo carrier
ACCS	active contamination control system
ACD	advanced control devices
ACD	architectural control document
ACD	attitude control determination/development
ACDS	Attitude Control & Determination System
ACE	acceptance checkout equipment
ACE	attitude control electronics
ACI	allocated configuration identification
ACI	Associate Contractor Integration/Interface
ACIS	avionics/crew interface simulator
ACISS	Advisory Committee on the International Space Station
ACLS	automated control and landing system
ACM	Association of Computing Machinery
ACM	attitude calibration module

ACON	antenna controller
ACR	active cavity radiometer
ACR	actual cost report
ACRC	assured crew return capability
ACRFG	Assembly Contingency Radio Frequency group
ACRV	Assured Crew Return Vehicle
ACS	altitude control and stabilization
ACS	assembly contingency subsystem
ACS	atmospheric control and supply
ACS	attitude control system
ACSE	attitude control system electronics
ACTORS	Ada cognitive task organization scheme
ACTRA	assembly contingency transmitter receiver/amplifier
ACTS	Advanced Communications Technology Satellites
ACVC	Ada compiler validation capability
ACWP	actual cost of work performance
AD	Analog to Digital
AD	advanced development
AD	aperture door
AD&D	Avionics Design & Development
AD&I	Avionics Design and Integration

ADA	automatic data acquisition
Ada	a computer programming language
ADCS	attitude determination and control subsystem
ADCU	AC to DC converter unit
ADD	Architecture Description Document
ADD	architectural definition/design document
ADDS	advanced development docking system
ADF	Avionics Development Facility
ADH	advanced development hardware
ADL	Ada design language
ADM	advance development models
ADP	acceptance data package
ADP	advanced development plan/program
ADP	automated data processing
ADPA	airlock depressurization pump assembly
ADPE	automated data processing equipment
ADPE/S	automated data processing equipment and systems
ADPG	Atmospheric Dynamic Payload group
ADR	achievable data rate
ADS	aerospace data systems
ADS	ancillary data system

ADS	attitude determination system
ADS	audio subsystem
ADSMB	attitude determination system mounting base
ADSS	Aerospace Data Systems Standards
ADVLAM	Advanced Laminate Analysis Code
ADVT	ADA development environment
AE	assembly element
AE	Avionics Integrated Environment
AEM	Animal Enclosure Module
AEPI	atmospheric emissions photometric imaging
AFA	American Fine Arm
AERCam	Auonomous EVA Robotic Camera
AFD	aft flight deck
AFDB	Award Fee Determination Board
AFDE	aft flight deck equipment
AFDWS	aft flight deck workstation
AFSIG	ascent flight systems integration group
AFT	aft flight test
AG	application generator
AGCS	artificial gravity centrifuge system
AGE	aerospace ground equipment

AGIT	antenna group interface tube
AGSD	advanced ground segment design
AHRS	attitude heading reference system
AI	action item
AI	Articulation Index
AIA	analysis/architecture
AIAA	American Institute of Aeronautics and Astronautics
AIBS	American Institute of Biological Sciences
AID	altered item drawing
AID	automated identification device
AID	Avionics Integrated Development
AIDS	airborne integration data system
AIDS	automated identification development system
AIDS	Avionics Integrated Development Schedule
AIM	Automated Information Management
AIMS	Automated Information Management System
AIO	analog input/output
AIP	Assembly Integration Panel
AIPD	Avionics Installation Packaging Design
AIPO	Artificial Intelligence Project Office
AIPR	automated information processing resources

AIR	Action Item Report
AIRD	Assembly Implementation Requirements Document
AIS	Automated Information System
AIS	APCE interface set
AIS&S	Avionics Integrated Systems and Software
AIT	Analysis and Integration Team
AIV	Avionics Integrated Verification
AIVRB	Avionics Integrated Verification Review Board
AIWG	ADF Interface working group
AIX	Advanced Interactive Executive
AJPO	ADA Joint Program Office
AJTIC	alpha joint transfer interface converter
Al	artificial intelligence
ALERT	acute launch emergency restraint tip
ALMS	automated logistics management system
ALO	airlock outfitting
ALOD	Airlock Outfitting Design
ALS	advanced life support
ALS	alternate landing site
alt	altitude
AM	amplitude modulation

AMD	advanced micro devices
AMDB	Automated Maintenance Data Base
AMDD	Assembly and Maintenance Definition Document
AME	antenna mounted equipment
AMIDD	Assembly Maintenance Implementation Definition Document
AMO	Advance Material Order
AMP	amplifier
amp	ampere
AMR	advanced microwave radiometer
AMVP	Assembly and Maintenance Verification Plan
ANSI	American National Standards Institute
AO	airlock outfitting
AO	atomic oxygen
AO	Assembly Order
AOA	Assembly Operations Assessment
AODC	age of data, clock
AODE	age of data ephemerals
AOE	area of emphasis
AOEA	Assembly Operations and Engineering Assessment
AOS	acquisition of signal
AP	application processor

AP	attached payload
Ap	Geomagnetic Activity Index
AP&AE	attached payloads and associated equipment
APA	Allowance for Program Adjustment
APAE	attached payload accommodations equipment
APAS	Androgynous Peripheral Attachment System
APC	all-purpose carrier
APC	autonomous payload controller
APCE	automated product/program control environment
APCU	assembly power converter unit
APD	astronaut positioning device
APDS	Androgynous Peripheral Docking System
APID	application process identification
APID	Application Program Interface Division/Definition
APL	approved parts list
APM	astronaut positioning mechanism
APM	attached pressurized module
APP	attached payload pallet
APPR	Avionics Project Planning Review
APR	assembly planning review
APS	astronaut positioning system

APS	Automated Payload Switch
APSE	ADA programming support environment
APT	advanced propulsion test
APT	automatic picture test/transmission
APU	audio/auxiliary power unit
APU	auxiliary propulsion/processing unit
AR	Acceptance Review
AR	atmospheric revitalization
Ar	argon
AR&D	Automated Rendezvous and Docking
ARA	attitude reference assembly
ARC	Ames Research Center
ARCA	attached resupply carrier
ARCU	American to Russian Converter Unit
ARIS	Active Rack Isolation System
ARMS	Automated Requirements Management System
ARO	after receipt of order
ARQ	automatic repeat queueing
ARS	air revitalization system
ART	advanced reasoning tool
ARTA	advanced radiator test article

ARTE	ADA runtime environment
ARTEID	ARTE interface definition
ARTEMIS	Automated Reporting, Tracking, and Evaluation Management Information
S
ARTS	automated requirements traceability system
ARTS	Advanced RID Tracking System
AS	aft shroud
ASA	Auxilliary Solar Array
ASAD	alpha solar array drive
ASAP	Aerospace Safety Advisory Panel
ASC	altitude stabilization and control
ASCAN	Astronaut Candidate
ASCG	automatic solution crystal growth
ASCII	American Standard Code for Information Interchange
ASCR	assured safe crew return
ASD	Avionics Systems Design
ASE	airborne support environment
ASE&I	Avionics Systems Engineering and Integration
ASEB	Aeronautics & Space Engineering Board
ASEM	assembly of station by EVA methods
ASF	assembly support framework

ASI	Agencia Spatiale Italiano
ASIC	application-specific integrated circuit
ASME	American Society of Mechanical Engineers
ASNT	American Society for Nondestructive Testing
ASO	Advanced Solar Observatory
ASRA	assembly sequence/resource allocation
ASRS	automated support requirements system
ASRS	automated software reporting system
assy	assembly
AST	American Segment Trainer
ASTP	Advanced Systems Technology Program
ASTP	Apollo Soyuz Test Program
AT	acceptance test
AT	autonomous transporter
ATA	ammonia tank assembly
ATA	atmospheres, absolute
ATAC	Advanced Technology Advisory Committee
ATB	Acceptance/Assembly Test Building
ATB	antenna test bed
ATCS	Active Thermal Control System/Subsystem
ATD	astronaut translation device

ATDAC	acoustical theory for design of aircraft cabins
ATE	airborne/automated test equipment
ATF	Autonomous Thruster Facilities
ATHENA	advanced thermal hydraulic energy network analyzer
ATM	Apollo telescope mount
ATMM	active thermal math models
ATMOS	atmospheric trace modules observed by spectroscopy
ATMOS	automatic testing multiple operating system
ATO	abort-to-orbit
ATP	acceptance test procedure
ATP	authority to proceed
ATS	active thermal system
ATS	attitude transfer system
ATS	assembly truss structure
ATSL	ADA Technology Support Laboratory
ATT	ADA transition test
ATT	assembly task team
ATU	audio terminal unit
ATV	Automated Transfer Vehicle
AU	astronomical unit
AV	Avionics Verification

AVHRR	advanced very high resolution radiometer
AVI	avionics integration
AVMl	automated visual maintenance information
AVR	Assembly and Verification Review
AVU	artificial vision unit
AWCS	agency-wide coding structure
AWG	American Wire Gauge
AWG	Avionics Working Group
AWP	assembly work platform
AWS	airlock workstation
ax	x-axis acceleration
ay	y-axis acceleration
az	azimuth
az	z-axis acceleration
b	bit
B&G	bridges and gateways
B&P	Bid and Proposal
B&PV	Boiler and Pressure Vessel
B/L	baseline
BAC	Boeing Aerospace Company
BAC	budget at completion

BAE	Boeing Aerospace Engineering
BAFO	best and final offer
BAG	Baseline Advisory Group
BB	breadboard
BBC	Bolt Bus Controller
BC	bus controller
BCD	baseline control/configuration document
BCD	Budget Change Document
BCDU	Battery Charge/Discharge Unit
BCE	beamsplitter control electronics
BCOP	Bilateral Crew Operations Panel
BCR	battery charge regulator
BCR	Budget Change Report
BCU	bus controller unit
BCWP	budgeted cost for work performed
BCWS	budgeted cost for work scheduled
BD	bypass diode
BDCF	baseline data collection facility
BDEA	bilateral data exchange agreements
BDR	battery discharge regulator
BER	bit error rate

BGA	beta gimbal assembly
BIA	bus interface adapter
BID	block interconnect diagrams
BIF	bus interface function
BlT	built-in-test
BITE	built-in test equipment
BIU	buffer/bus interface unit
BIU	built-in unit
BIVP	Bilateral Integration and Verification Plan
BLDG	building
BLIM	berthing latch interface mechanism
BM	business management
BMA	bolt motor actuator
BMAC	biomedical monitoring and countermeasures
BMAD	Berthing Mechanisms Advanced Development
BME	biomedical engineer
BMMD	body mass measurement device
BMO	Business Management Office
BMR	body mounted radiator
BMR	Business Management Representative
BN	ballistic number (W/CDA)

BNIU	bus network interface unit
BOC	basic operational capability
BOE	basis of estimate
BOL	beginning of life
BOS	bright object sensor
BP	biological processing
BPFM	Bright Field/Phase Contrast/Fluorescence Microscope
BPM	biological production module
BPR	Bilateral Program Review
BPRV	back pressure regulating valve
bps	bits per second
BPSK	Binary phase shift keying
BR	bit rate
BSAD	beta solar array drive
BSCCM	Battery Signal Conditioning and Control Module
BSP	baseband signal processor
BSP-T	baseband signal processor-TDRSS
BSP-V	baseband signal processor-video
BSR	biweekly schedules reviews
BTPS	body temperature and pressure saturated
BTF	Biotechnology Facility

BTS	Biotechnology System
Btu	British thermal unit
BTU	bus terminal unit
BW	bandwidth
byte	A sequence of adjacent binary digits operated as a unit
byte/s	bytes per second
C	centigrade, Celsius
C&C	command and control
C&DH	Command & Data Handling
C&M	control and monitor
C&PCC	core and payload control centers
C&T	Communications and Tracking
C&TS	Communications and Tracking System
C&W	caution and warning
C-MPAC	cupola MPAC
c.d.t.	central daylight time
c.s.t.	central standard time
C/C	command/control
C/D	countdown
C/O	checkout
C/S/T	cost/schedule/technical

C/V	cooperative vehicle
c2	command and control
C3	command, control, and communications
C3I	command, control, communications, and intelligence
CA	control architecture
CA	cost account
CA	customer accommodations
CAA	computer-aided analysis
CACTIS	Change and Commitment Tracking Information System
CAD	computer-aided design
CADD	computer-aided design and drafting
CADU	channel access data unit
CAE	computer-aided engineering
CAG	Commercial Advocacy Group
CAGE	Commercial and Government Entity
CAI	computer-aided instruction
CAIS	Computer-Aided Instructional System
CAIT	computer-aided instructional trainers
CAL	Common Airlock
CAL	computer-aided Logistics
CALS	computer-aided acquisition and logistics support

CAM	centrifuge accommodation module
CAM	computer-aided manufacturing
CAM	Cost Account Manager
CAP	Computer-Aided Planning
CAP	Cost Account Plan
CAP	Crew Activity Plan
CAPP	computer-aided project planning
CAPS	Computer Assisted Publication Service
CAPS	Crew Activity Planning System
CAR	Certification Approval Report/Request
CAS	calibrated ancillary system
CAS	Common Attach System
CAS	cost accounting standard
CASA	computer-aided systems analysis
CASB	Cost Accounting Standards Board
CASE	checkout and servicing equipment
CASE	crew accommodations and support equipment
CASE	Computer-Aided Software/Systems Engineering
CAT	computer-aided test
CAT	computerized axial tomography
CATCS	Central Active Thermal Control System

CB	center of buoyancy
CB	Control Board
CB	Control Bus
CBD	common data base
CBDS	circuit board design system
CBM	common berthing mechanism
CBR	Configuration Budget Review
CBR	contract baseline rephasing
CCA	cause-consequence analysis
CCA	clinical chemistry analyzer
CCA	Contract Change Agreement/Authorization
CCAA	Common Cabin Air Assembly
CCAFS	Cape Canaveral Air Force Station
CCAS	Cryogenic Carrier Attach System
CCB	Change/Configuration Control Board
CCBD	Configuration Control Board Directive
CCC	Consolidated Control Center
CCC	Control Center Complex
CCCN	customer coordination center node
CCD	charged coupled device
CCDS	Centers for the Commercial Development of Space

CCF	Consolidated Communications Facilities
CCFCD	Command and Control Functional Control Document
CCL	Cyber Control Language
CCM	Composite Change Memo
CCM	crew/cargo module
CCMS	Command Control and Monitoring System
CCN	contract change notice
CCN	customer coordination node
CCO	contract change order
CCP	Configuration Control Panel
CCP	Contamination Control Plan
CCP	Contract Change Proposal
CCR	Configuration Control Review
CCR	contract change request
CCS	communication and control system
CCS	contamination control system
CCSDS	Consultive/Consultative Committee for Space Data Systems
CCTV	closed circuit television
CCW	channel command word
CCW	command/control workstation
CCWS	command/control workstation

CCZ	command and control zone
CD	contract direction
CDD	Common Data Dictionary
CDDT	Common Display Development Team
CDG	Concept Development Group
CDM	Contract Data Management
CDM	Corona Diagnostic Mission
CDMA	code division multiple access
CDMO	Configuration and Data Management Office
CDMO	Contract Data Management Office
CDO	Commercial Development Office
CDOS	customer data and operations system
CDR	commander
CDR	Contract Data Requirements
CDR	Critical Design Review
CDRA	carbon dioxide removal assembly
CDRL	Contract Data Requirements List
CDS	core data services
CDT	customer documentation tree
CDU	component development unit
CE	camera electronics

CE	cargo element
CE	concurrent engineering
CE	conducted emission
CE	current estimate
CE&IS	combined elements and integrated system
CEA	control electronic assembly
CEA	Customer Expectation Agreement
CEB	Change Evaluation Board
CEDRID	Cargo Element Design Requirement Input Document
CEI	contract end item
CEIS	combined elements and integrated systems
CELSS	closed environmental life support system
CEMS	crew and equipment mobility system
CEO	Configuration Engineering Office
CER	cost estimating relationship
CERS	crew emergency rescue system
CERS	crew equipment retrieval system
CERT	certification
CERV	crew emergency return vehicle
CETA	crew and equipment translation assembly
CETF	Critical Evaluation Task Force

CETTR	crew and equipment translation techniques and routing
CEV	combined elements verification
CEV	common element verification
CEVT	combined element verification and testing/training
CEWG	Crew Exchange and Training Working Group
CF	Centrifuge Facility
CF	completion form
CFC	chlorinated fluorocarbon
CFDB	crew functions data base
CFE	contractor-furnished equipment
CFM	candle flames in microgravity
cfm	cubic feet per minute
CFP	conceptual flight profile
CFR	Code of Federal Regulations
CFS	cryogenic fluid storage
CFT	crew factors
CFU	colony forming unit
CG	center of gravity
CGBA	Commercial Generic Bioprocessing Apparatus
CGM	Computer Graphics Metafile
CGS	Columbus Ground System

CGSP	crystal growth and solidification processes
CGTG	Crystal Growth Technology Group
CHAMPS	characteristics of hardware assemblies & mission-build planning system
CHeCS	Crew Health Care Systems
CHIA	Cargo Handling Interface Adapter
CHL	Certified Hardware List
CHRS	centralized heat removal systems
CHSF	Cargo Hazardous Servicing Facility
CHSL	certified hardware/software list
CHX	cabin heat exchanger
CHX	condensing heat exchanger
CI	change integrator
CI	configuration/contract item
CI	customer integration
CICD	Contractor Interface Control Document
CID	critical item development
CIDSC	Contractor In-House Data Support Capability
CIE	Commission Eclieree
CIE	computer-integrated engineering
CIFO	Catalog of Interface Features and Options
CIL	Critical Items List

CILS	crew-in-the-loop simulator
CIN	Center Information Network
CIN	Computer Information Network
CIO	Customer Integration Office
CIO	Center Information Officer
CIP	Customer Integration Panel
CIR	Cargo Integration Review
CIS	communication interface system
CIS	customer information system
CIS	change impact summary
CITE	cargo integration test equipment
CIVL	Concept Integration and Verification Laboratory
CL	crewlock
CL	capture latch
CLA	coupled loads analysis
CLAN	Core Local Area Network
CLASS	communications link analysis and simulation system
CLASS	II Comprehensive LSAR automated Support System II
CLDF	Clear Lake Development Facility (now Sonny Carter Training Facility)
CLI	command line interpreter
CLIP	Crew Loads Instrumented Panel

CLS	Columbus Language System
CLS	contingency landing site
CLUG	Class II Users Group
CM	center of mass
CM	common module
CM	configuration management
CM	contract management
CM	countermeasures
cm	centimeter
CMA	common MPAC adapter
CMA	control and monitor application
CMAIT	Configuration Management Analysis and Integration Team
CMAM	Commercial Middeck Augmentation Module
CMC	Contract Management Command
CMCD	CIDSC Master Configuration Document
CMCS	Configuration Management and Control System
CMD	command
CMD/CTL	command/control
CMDB	control and monitor display builder
CMDE	CMDM executor
CMDM	Control and Monitor Display manager

CMDS	Configuration Management Data System
CMG	control moment gyro
CMILP	consolidated maintenance, inventory, and logistics planning
CMIP	Common Management Information Protocols
CMIS	Common/Configuration Management Information System
CMO	Configuration/Contract Management Office
CMOS	complementary metal oxide semiconductor
CMP	Configuration Management Plan
CMP	Command Monitor Panel
CMPL	Commercial Materials Processing Lab
CMRS	CHeCS Medical Restraint System
CMRS	Crew Medical Restraint System
CMS	control and monitor subsystem
CMSP	Configuration Management Screening Panel
CMT	configuration management tool
CMT	crew maintenance time
CNES	The French Space Agency
CNS	computer network system
CNTRL	central. control
CO	carbon monoxide
CO	Contracting Officer

CO2	carbon dioxide
COAS	coarse/crew optical alignment sight
COB	cargo onboard
COCOMO	cost constructive model
COD	Center Operations Directorate
CoF	construction of facility
COF	Columbus Operating Facility
CoFR	certification of flight readiness
COL	Contracting Officer Letter
COM	communications
COMBO	computation of miss between orbits
COMET	Commercial Experiment Transporter
COMM	commercial mission
COMM	communications
COMPASS	computer-aided scheduling system
COMSAT	Communications Satellite
COMSEC	Communications Security
CONLAS	controls analysis simulation
CONT	container
CONT	contingency
CONTAM	contamination

COP	co-orbiting platform
COR	Communications Outage Recorder
COS	Corporation of Open Systems
COSM	checkout, services, and maintenance (airlock equipment)
COSMIC	Computer Software Management and Information Center
COSMIC	coherent optical system of modular imaging collectors
COSS	co-orbit support systems
COTR	Contracting Officer's Technical Representative
COTS	commercial off-the-shelf
COU	Concept of Operations and Utilization
COUP	Consolidated Operations and Utilization Plan
CP	center of pressure
CP	commercially pure
CP	communications processor
CP	containerless processing
CPAF	cost plus award fee (type of contract)
CPC	Central Post Computer
CPCG	Commercial Protein Crystal Growth
CPDS	charged particle directional spectrometer
CPDS	Computer Program Development Specification
CPFF	cost plus fixed fee

CPI	Cost Performance Index
CPM	computer program module
CPM	critical path method
CPMO	Central Printing Management Office
CPN	critical path network
cps	characters per second
CPS	coarse pointing system
cps	cycles per second
CPSR	Contractor Purchasing System Review
CPU	central processing unit
CR	change request
CR	Configuration Review
CR	Cosmonaut Researcher
CR&D	Contract Research and Development
CR/DR	Change Request/Discrepancy Report
CRAD	Contract Research and Development
CRDB	Crew Requirements Data Base
CRDS	Customer Requirements Data Set
CRI	Certification Requirements Index
CRIDR	Contract Requirement/Data Requirement
CRM	chemical release module

CRP	Cost Reduction Proposal
CRS	change request sheet
CRT	cathode ray tube
CRU	catalytic research unit
CRY	cryogenics
CRYT	cryogen tank
CS	conducted susceptibility
CS	control segment
CS	crew systems
CS-ES	conceptual schema to external schema
CS-IS	conceptual schema to internal schema
CSA	Canadian Space Agency
CSA	computer systems architecture
CSA-CP	Compound Specific Analyzer-Combustion Products
CSA-H	Compound Specific Analyzer-Hydrazines
CSC	computer software component/configuration
CSCI	computer software/system configuration item
CSD	Common Schedule Database
CSD	contract start date
CSD	control system development
CSDI	Contract Status Data Input

CSE	Chief Systems Engineer
CSEV	combined systems and elements verification
CSF	Customer Servicing Facility
CSI	control servo input
CSR	Certification Status Report
CSR	customer support room
CSS	crew support station
CST	Competitively Sensitive Technology
CSU	Computer Software Unit
CSW	Centralized Software
CTB	central thermal bus
CTE	commercial test equipment
CTL	control
CTM	contract technical manager
CTMS	commercial teleoperator maneuvering system
CTR	contract technical representative
CTSD	Crew and Thermal Systems Division
CTSIM	Communications & Tracking simulator
CTT	crew transfer tunnel
CTV	Crew Transfer Vehicle
CTVC	closed loop television camera

CU	customer utilization
Cu-FO	copper and fiber optic
CUA	carrier utilization agreement
CUI	common user interface/item
CUI	customer user interface
CUP	Consolidated Utilization Plan
CV	cost variance
CVCM	collected volatile condensible materials
CVD	chemical vapor deposition
CVDT	Current Value Data Table
CVIU	common video interface units
CVT	Current Value Table
CWBS	Contract Work Breakdown Structure
CWG	Commonality working group
CWR	Collapsible Water Reservoir
CWS	caution and warning system
CWSIT	Caution and Warning System Integration Team
CY	calendar year
CZE	capillary zone electrophoresis
D&B	docking and berthing
D&C	displays and controls

D&D	design and development
D-LOG	discrepancy log
D/A	digital to analog
D/A	desk accessory
DA	data administrator
DA	device attachment
DA	docking adaptor
DAA	Designated Approving Authority
DAC	Design Analysis Cycle
DACT	disposable absorbent containment trunk
DADS	data acquisition and distribution system
DADS	digital audio distribution systems
DAI	detailed architecture inspection
DAP	digital auto pilot (orbiter)
DARA	The German Space Agency
DAS	digital avionics system
DASA	Deutsche Aerospace
DB	data base
DB	diode box
DB	dry bulb temperature
DB	display builder

dB	decibel
DBA	data base administrator
DBM	data base management
DBME	data base management element
DBMS	data base management system
DBN	Data Bus Network
DBS	direct broadcast sounder/satellite
DC	direct current
DC	docking compartment
DCA	document content architecture
DCAA	Defense Contract Audit Agency
DCAM	Dialysis Crystallization Apparatus for Microgravity
DCCAS	Dry Cargo Carrier Attach System
DCE	data communications equipment
DCE	dual cycle ergometer
DCLS	data collection and location system
DCMC	Defense Contract Management Command
DCN	document change notice
DCR	Design Certification Review
DCS	decompression sickness
DCS	Digital Communications Subsystem

DCSU	DC switching unit
DCT	direct cosine transform
DCU	dedicated control unit
DD/D	data dictionary/directory
DDCU	DC-to-DC converter unit
DDF	Display Data File
DDF	Display Definition File
DDP	Design Decision Package
DDP	deliverable data package
DDR	Detailed Design Review
DDRM	Data, Document and Records Management
DDT&E	design, development, test, and evaluation
DDT&V	detail design test and verification
DDTS	digital data transmission system
DDTS	dynamic docking test system
DDU	data display unit
DE	design engineering
DE	dose equivalent
DEC	data entry clerk
DED	Data Element Dictionary
deg	degree

DEL	delivery
DEMUX	demultiplexer
DES	Digital Encryption Standard
DESC	Defense Electronic Supply Center
DEV	development
DF	development flight
DFD	data flow diagram
DFI	development flight instrumentation
DFRF	Dryden Flight Research Facility
DFRR	Detailed Functional Requirements Review
DG	data group
DHC	data handling center
DHF	data handling function
dia	diameter
DID	data item description
DIDB	Drawing Index/Informantion data base
DlET	design-to-cost information, estimating, and tracking
DIF	Data Interface Facility
DIF	data interchange format
DIL	Deliverable Items List
DIO	discrete input/output

DIPEC	Defense Industrial Plan Equipment Center
DISU	dual input switching unit
DIT	Development Integration Test
DIT	Dynamic Integrated Test
DITFAC	Development, Integration & Test Facility
DIU	data interface unit
DKC	Design Knowledge Capture
DKSS	design knowledge support system
DKSSEC	design knowledge support system electronic catalog
DL	data discrepancy list
DLI	Defense Language Institute
DLA	drive lock assembly
DLSC	Defense Logistics Service Center
DM	Dialog manager
DM	docking module
DM&P	Data Management and Processing
DMA	direct memory access
DMA	Digraph Matrix Analysis
DMAP	direct matrix absorption program
DMATE	Delta MDM application test equipment
DMCS	data management and control system

DMS	Data Management System
DMS	data management simulator
DMS-R	Data Management System - Russian
DMSADA	Data Management System automatic data acquisition
DMST	Development and Segment Team
DMT	Decreed Moscow Time
DOC	document
DOC	Discipline Operations Center
DoD	Department of Defense
DoE	Department of Energy
DOF	degree of freedom
DOF	direction of flight
DOMSAT	Domestic Communications Satellite (system)
DOP	Doppler
DOR	Director of Operations in Russia [NASA representative at Star City]
DOR	daily outage report
DoS	Department of State
DOS	detailed operations scenario
DOS	Disk Operating System
DOS	distributed operating system
DP	data package/processing

DPA	degration performance analysis
DPA	delegation of Procurement authority
DPA	destructive physical analysis
DPD	data procurement department/document
DPD	Data Project Description
DPRO	Defense Plant Representative Office
DPS	Data Processing Subsystem
DPS	Data Processing System
DPSD	Data Processing Systems Division
DR	data requirement
DR	design review
DR	discrepancy report
DRA	Design Requirements Agreement
DRA	design review agreement
DRAM	dynamic random access memory
DRCC	document release and change coordination
DRCL	design requirements checklist
DRD	data requirement description/document
DREQ	design requirement
DRIS	Diagnostic Radiologic Imaging System
DRL	data requirements list

DRLI	Data Requirements List Items
DRM	Design Reference Mission
DRO	dielectric resonance oscillator
DRR	Design Requirements Review
DRS	Dexterous Robotics System
DRTS	Data Relay Tracking Satellite
DRWG	Data Reconfiguration Working Group
DS	data sheets
DS&R	data storage and retrieval
DS/FE	distributed system and flight element
DSA	data systems architecture
DSAR	data storage and retrieval
DSCG	directional solidification crystal growth
DSH	development support hardware
DSM	Docking and Stowage Module
DSMC	Defense Systems Management College
DSMT	disturbance simulation management tool
DSN	Deep-Space Network
DSO	Detailed Science/Supplementary Objective
DSR	Design Status Review
DSRS	Data Storage and Retrieval System

DSS	data/decision support system
DSS	Data System Services
DSSD	Data Structure and Systems Development
DSSIP	data systems and software integration panel
DSTP	Detailed System Test Procedure
DT&E	Development Test and Evaluation
DTA	dedicated/development test article
DTC	design-to-cost
DTE	data terminal equipment
DTF	Development Test Facility
DTL	detailed time line
DTLCC	design to life-cycle cost
DTO	detailed/development test objective
DU	development unit
DVCS	data/voice communications system
DVIS	Digital Voice Intercom System
DVR	Detailed Verification Requirement
DVTM	design verification test model
e	electron
E&I	Engineering and Integration
E&PD	Engineering and Product Definition

E(r)	Earth radius
e.d.t.	Eastem Daylight Time
E/E	electrical/electronics
E/I	end item
E/W	East/West
EA	Integrated Electronics/Equipment Assembly
EAC	engineering analysis capability
EAC	estimate at completion
EAF	engineering analysis function
EAMIP	EVA Assembly & Maintenance Integration Plan
EAR	Engineering Analysis Report
EASE	electrical automatic support equipment
EBCD	extended binary coded decimal
EC	electrolysis cell
EC	exercise countermeasure
ECAD	electronic computer-aided design
ECC	Engineering Change Control
ECD	element control/configuration document
ECF	Exercise Countermeasures Facility
ECFWS	Exercise Counter Measures Facility Workstation
ECG	electrocardiogram

ECG	electroepitaxial crystal growth
ECIS	environmental control & life support
ECLSS	Environmental Control and Life Support System
ECN	engineering change notice
ECO	engineering change order
ECP	engineering change proposal
ECS	Environment Control System
ECS	Energy Conversion Subsystem
ECU	electronics/environmental control unit
ECWS	element control workstation
ED	electrodynamics
ED	electronics lock deck
EDAC	error detection and correction
EDC	Engineering Design Council
EDCAS	Equivalent Designers Cost Analysis System
EDCO	extended duration crew operations
EDDS	engineering documentation/drawing data system
EDF	Engineering Data Function
EDF	electronic/engineering design/development fixture
EDFE	EVA Demonstration Flight Experiment
EDIP	Element Design Integration Panel

EDK	Electric Dynamic Karathermometer
EDL	Engineering Data Library
EDL	Engineering Drawing List
EDLS	Engineering Data/Drawing Library System
EDLS	Enhanced Dynamic Load Sensor
EDM	Electrical Discharge Machining
EDMU	Engineering development mockups
EDO	extended duration Orbiter
EDP	Electronic/Embedded Data Processing/Processor
EDRM	Engineering Design/Drafting Reference/Requirements Manual
EDRS	European Data Relay Satellite
EDU	engineering development unit
EEATCS	Early External Active Thermal Control System
EECOM	electrical, environmental, and communications
EECOMS	Electrical, Environmental Consumables, and Mechanical Systems
EEE	electrical, electronic, and electromechanical
EEG	electroencephalograph
EEPROM	Electrically Erasable Programmable Read Only Memory
EESS	End-to-End Software Simulator
EETCS	Early External Thermal Control System
EEU	extravehicular excursion unit

EF	Exposed Facility
EGRET	Energetic Gamma Ray Experiment Telescope
EGSE	electrical ground support equipment
EH	Equivalent Hertz
EHD	engineering hardware description
EHF	extremely high frequency
EHS	Enhanced HOSC system
EHS	Environmental Health System/Subsystem
EI	external integration
EIA	Electronic (Electrical) Industry Association
EIP	element integration panel
EIR	element integration review
EIRP	Effective Isotropically Radiated Power
EIS	End Item Specification
EISC	EVAS Internal Stowage Compartments
EKG	electrocardiogram
EL	east longitude
EL	equipment lock
EL	exposure limits
ELF	extremely low frequencies
ELIN	exhibit line item number

ELM	experiment logistics module
ELM-ES	Experiment Logistics Module-Exposed Section
ELM--PS	Experiment Logistics Module-Pressurized Section
ELS	emergency landing site
ELT	emergency locator transmitter
ELV	expendable launch vehicle
EM	engineering model
EM	energy module
EM	electromagnetic
EM	environmental monitor
EMADS	Emergency Malfunction and Display System
EMC	electromagnetic compatibility
EMCC	eight man crew capability
EMCFA	Electromagnetic Compatibility Frequency Analysis
EME	electromagnetic effects
EMI	electromagnetic interface
EMI	electromagnetic interference
EMP	enhanced multiplexer/demultiplexer pallet
EMR	electromagnetic radiation
EMS	Engineering Master Schedule
EMS	Engineering Master Schedule/Services

EMSF	Extemal Maintenance and Servicing Facility
EMST	External Maintenance Solution Team
EMTC	early man-tended capability
EMTT	Etemal Maintenance Task Team
EMU	extravehicular maneuvering/mobility unit
EO	Earth orbit
EO	electro-optical
EO	electronics lock overhead
EO	engineering order
EO	executive order
EOC	End of Contract
EOIM	Environmental Oxygen Interaction with Materials
EOL	end of life
EOM	end of mission
EOMA	Element OMA
EOS	Earth Observation System
EOS	Electrophoresis Operations in Space
EP	electrical power
EP	equivalent personnel
EP's	equivalent persons
EPA	Environmental Protection Agency

EPCE	electrical power consuming equipment
EPDB	Electrical Power data base
EPDCS	Electrical Power Distribution and Control System
EPDS	Electrical Power Distribution System
EPDS	European Data Relay Satellite
EPIC	engineering planning, integration, and coordination
EPIRB	Emergency Position-Indicating Radio Beacon
EPL	Electronic, Electrical, and Electromechanical Parts List
EPIMS	EEE Parts Information Management System
EPS	Electrical Power System
EPS	Engineering Purchase Specification
EPWG	Electrical Power working group
EQID	Equivalent ID (number)
ER	Environmental Rights (OMS term)
ER	engineering release
ERA	Exobiology and Radiation Assembly
ERA	European Robotic Arm
ERB	Engineering Review Board
ERBE	Earth Radiation Budget Experiment
ERCA	Electrochemically Regenerable CO Absorber
ERD	Entity Relationship Diagram

ERM	Entity Relationship Model
ERNO	European Research National Organization
ERODB	Environmental Run Time Operating data base
ERVS	Emergency Routine Verification Schedule
ES	equipment section
ES	EVA support
ES	expert system
ESA	European Space Agency
ESC	electronic still camera
ESC	Engineering Support Center
ESD	electrostatic discharge
ESE	EVA support equipment
ESE&T	EVA support equipment and tools
ESF	Engineering Support Facility
ESH	equivalent sun hours
ESIT	Electrical System Integrated Test
ESM	Experiment Support Module
ESMC	Eastern Space and Missile Center
ESMR	electrically scanned microwave radiometer
ESPACS	EMIJ Signal Processing and Communications Set
ESR	Earth Science Research

ESS	electronic security system
ESS	emergency separation system
ESS	energy storage subsystem
ESS	environmental stress screening
ESS	experiment support system
ESSMDM	enhanced Space Station multiplexer/demultiplexer
EST	eastern standard time
ESTEC	European Space Technology Center
ESTL	Electronic System Test Laboratory
ET	effective temperature
ET	external tank
ETA	engineering test article
ETC	end-to-end test capability
ETC	estimate to completion
ETE	EVA translation evaluation
ETED	external thermal environment data
ETEDB	External Thermal Environment data base
ETI	elapse time indicator
ETP	Equipment Test Plan
ETR	Eastern Test Range
ETRO	Estimated Time of Return to Operation

ETS	Engineering Technical/Test System
ETU	Engineering test unit
eV	electron volts
EV-CPDS	Extravehicular/External Charged Particle Directional Spectrometer
EVA	extravehicular activity
EVAR	EVA retriever
EVARDS	EVA/Robotics Design Standards
EVAS	extravehicular activity system
EVC	extravehicular communication
EVR	extravehicular robotics
EVS	equipment visibility system
EW	extreme ultraviolet
EWAC	Emergency Warning and Caution
EXP	Explorer Mission
EXPRESS	expediting the process of experiments to the Space Station
F	flight
F	forward
F	Fahrenheit
F-MPAC	fixed multipurpose application console
F/W	firmware
FAB	flight assignment baseline

FABRS	Fabrication Reporting System
FAC	facility
FACI	First Article Configuration Inspection
FACTS	FMEA/CIL tracking system
FAM	functional area manager
FAO	Flight Activity Officer
FAP	Flight Activity Plan
FAR	Federal Acquisition Regulation
FAST	flexible Ada simulation tool
FAST	folding articulated square truss
FAX	facsimile transmission
FBC	full body cleansing
FBM	fleet ballistic missile
FBT	Feedback Technology
FC	flight control
FC	fuel cell
FCA	flow control assembly
FCA	Functional Configuration Audit
FCA	Funding Constraint Assessment
FCD	functional control document
FCF	Fluids and Combustion Facility

FCEF	Flight Crew Equipment Facility (at KSC)
FCI	Flight Crew Integration
FCIR	Flight Crew Integration Requirements
FCM	future capability mission
FCOD	Flight Crew Operations Directorate
FCOM	Facilities Capital Cost of Money
FCP	firm cost proposal
FCP	fluid and chemical processing
FCP	Fracture Control Plan
FCP	fuel consumption projection
FCS	FGB Communications System
FCS	Flight Crew Systems
FCT	file compare tool
FD	flight day/director
FD	flight design
FD	flight dynamics
FD/FI	fault detection/fault isolation
FDA	Food and Drug Administration
FDA	functional development article
FDDI	fiber distributed data interface
FDE	Flight Dynamics Engineer

FDF	flight data file
FDF	Flight Dynamics Facility
FDI/RM	fault detection and isolation/redundancy management
FDIR	fault detection, isolation and recovery/reconfiguration
FDM	Fault detection and management
FDMA	Frequency-Division Multiple Access
FDO	Fee Determination Official
FDP	Fatigue Decreased Proficiency
FDPA	flight dynamics and planning analysis
FDR	Final Design Review
FDS	Fire Detection System
FDS	fire detection and suppression
FDS	Flight Design Systems
Fe	iron
FEA	finite element analysis
FEAT	final engineering acceptance test
FEAT	failure environment analysis tool
FED-STDS	Federal Telecommunications Standards
FEID	Flight Equipment Interface Device
FEL	First Element Launch
FEM	finite element model

FEO	flight elements office
FEP	Front-end Processor
FEP	fluorinated ethylene propylene
FERD	Facility and Equipment Requirements document
FET	field effect transistors
FEU	functionally equivalent unit
FEU	flight evolution unit
FF	first flight
FF	free-flyer
FFFT	Forced Flow Flamespread Test
FFHD	First Flight Hardware Delivery
FFP	firm fed price
FFRR	First-Flight Readiness Review
FGB	Functional Cargo Block [sic] (Functionalui Germaticheskii Block)
FGE	fine guidance electronics
FGS	fine guidance sensor
FGSE	Fine Guidance System Electronics
FHRC	flex hose rotary coupler
FHST	Fixed Head Star Tracker
FIM	Flight/Functional Integration manager
FIMS	Fault Isolation Monitoring System

FIP	Flight Increment Plan
FIPS	Federal Information Processing Standards
FITL	flight increment training load
FLC	Fluids logistics carrier
FLD	fluid dynamics
FLPS	Flight Loads Preparation System
FLT	flight
FM	facility management
FM	flight model
FM	frequency modulation
FMA	failure modes analysis
FMA	fixed MPAC adapter
FMAD	fluid management and distribution
FMC	fluid momentum controller
FMEA	failure modes and effects analysis
FMECA	failure modes, effects, and criticality analysis
FMS	Financial Management Systems
FMS	fluid/food management system/subsystem
FMT	file and memory transfer [software]
FO	Fabrication Order
FO	fiber optics

FOB	free on board
FOC	faint object camera
FOC	fiber-optic cable
FOC	full optional capability
FODB	Fiber-Optic data bus
FOMMS	Flight Operations Maintenance Management System
FOR	Flight Operations Review
FORS	Fiber-Optic Rate Sensor
FOS	Faint Object Spectograph
FOSA	Flight Operations Support Annex
FOV	field of view
FP	fuse plug
FPC	Flexible Printed Circuit
fps	feet per second
FPSI	Focal Plane Science Instrument
FPU	Fluid Pump Unit
FQR	Formal Qualification Review
FR	facilities request
FR	foot restraint
FR	functional requirements
FRD	flight/functional requirements docurnent

FRE	Functional Requirement Envelope
FRED	Facilities Request Data Base
FRHC	Force Reflecting Hand Controller
FRR	Flight Readiness Review
FRS	Functional Requirements Summary
FS	Factor of Safety
FSD	fluid system design/distribution
FSD	full-scale development
FSE	flight support equipment
FSES	flight software execution system
FSIM	functional simulation
FSM	fungal spores monitor
FSR	Final Systems Review
FSSA	Flexible Substrata Solar Array
FSSR	flight system software requirement
FST	Fire Safety Technology
FSU	Functional Support Unit
FSVS	Flight Software Verification System
FSW	flight software
FSW	feet of sea water
ft	foot

FT	fault tolerant
FT/RM	Failure Tolerance/Redundancy Management
FTA	Fault Tree Analysis
FTAM	File Transfer and Access Method
FTE	Factory Test Equipment
FTE	Flight Test Engineer
FTMS	Fluid Transfer Management System
FTO	flight test objective
FTP	factory test program
FTP	Flight Test Procedure
FTP	Full Throttle Position
FTP	Functional Test Program
FTS	flight telerobotic servicer/system
FTS	Fluid Therapy System
FUDS	fluids utility distribution system
FUO	Followup Output
FW	filament winding
FWC	firmware controllers
FWWM	Food Water, and Waste Management
FY	fiscal year (Fiscal Year 1995, FY95)
g	gravity

G	giga (one billion)
g	Acceleration of Gravity
g	gram
G&A	General and Administrative
G&C	Guidance and Control
G&N	Guidance and Navigation
G.IM	Geometric Mathematical Model
G.m.t.	Greenwich Mean Time
G/L	greater than/less than
GaAIAs	gallium aluminum arsenide
GaAs	gallium arsenide
GANE	Global Positioning System (GPS) Attitude & Navigation Experiment
GAO	General Accounting Office
GASMAP	Gas Analysis System for Metabolic Analysis of Physiology
gb	gigabit
GBD	generation breakdown
GBF	Gravitational Biology Facility
GBL	Generation Breakdown List
gbps	gigabits per second
GC/IMS	gas chromatograph/ion mobility spectrometry
GC/MS	Gas Chromatograph/Mass Spectrometer

GCA	gas conditioning assembly
GCC	Ground Control Center
GCE	Ground Control Equipment
GCR	Galactic Cosmic Radiation/Ray
GCS	Ground Control Station
GCSD	Government Communications Systems Department
GCT	Growth Core Team
GCTC	Gagarin Cosmonaut Training Center
GDCS	Ground Distributed Control System
GDMS	Ground Data Management System
GDS	Ground Data Systems
GENPLAN	Generative Progress Planning
GEO	Geosynchronous Earth Orbit
GEODSS	Ground-Based, Electro-Optical Deep-Space Surveillance System
GEOMOD	geometric modeler
GET	Ground Elapsed Time
GeV	gigaelectronvolts
GF	grapple fixture
GFE	Government-furnished equipment
GFI	Govemment-furnished Information
GFM	Government-furnished material

GFP	Government-furnished property
GFY	Government Fiscal Year
GG	gravity gradient
GH2	gaseous hydrogen
GHz	gigahertz
GIDEP	Government-Industry Data Exchange Program
GKS	Graphical Kernal System
GL	Graphics Laboratory
GLS	Government Launch Services
GLSA	Government Large Structures Assembly
GLSC	Government Launch Services-Cryogenic
GLSF	General Laboratory Support Facilities
GM	Geometric Mean
GMOS	Generic Message Orientation System
GMS	Geostationary Meteorological Satellite
GMW	Generic Maintenance Workstation
GN	gaseous nitrogen
GN&C	guidance, navigation, and control
GN&C/MT	Guidance, Navigation, and Control/Mobile Transporter
GN&C/P	guidance, navigation, and control/propulsion
GNCM	guidance, navigation, control management

GO2	gaseous oxygen
GOC	Ground Operations Center (part of Mobile Servicing System)
GODF	Ground Operations Data File
GOE	Ground Outfitting Equipment
GOES	GN&C Orbital Environment Simulation
GOLIP	Ground Operations and Logistics Integration Panel
GPC	General Purpose Computer
GPO	Government Printing Office
GPP	General Purpose Processor
GPRP	Government Production and Research Property
GPS	Global Positioning System
GP/INS	Global Positioning System/Inertial Navigation System
GPTU	General Purpose Transfer Unit
GPWS	General Purpose Workstation
GR&C	Ground Rules and Constraints
Gr/E	Graphite-Epoxy
GRC	Glenn Research Center
GRD	general requirements docurnent
GRO	Gamma Ray Observatory
GRP	Glass Reinforced Plastic
Gs	geodetic

GS	Ground System
GSA	General Services Administration
GSC	Ground Station Control
GSD	General Services Division
GSDE	Ground System Development Environment
GSDR	Ground System Data Repository
GSE	ground support equipment
GSFC	Goddard Space Flight Center
GSFT	Ground Support Facilities and Tools
GSI	Government Source Inspection
GSP	ground support position
GSR	Generic Space Robot
GSRP	Ground Safety Review Panel
GSTDN	Ground Satellite Tracking Data Network
GT	global temperature
GT	Group Technologies
GTA	ground test article/assembly
GTOS	Ground Terminal Operations Support
GTOSS	Generalized Tethered Object System Simulation
GTR	Government transportation request
GTU	ground test unit

GV	gigavolt
GW	gateway
GWDU	ground window display utility
H	hydrogen
H/C	Hand Controller
H/W	hardware
HA	hazard analysis
HA/HP	Height of Apogee/Height of Perigee
HAB	habitation module
HABT	Habitability Technology
HAD	heat acquisition devices
HAL	High-Order Algorithmic Language
HAL	hyperbaric airlock
HARRB	Hazard and Requirements Review Board
HB	hyperbaric
HBC	Hyperbaric Chamber
HC	hydrocarbon
HCHP	High-Capacity Heat Pipe
HCI	Human-Computer Interface
HCIG	Human-Computer Interface Guidelines
HCIL	Human Computer Interface Laboratory

HCS	Hybrid Computation and Simulation
HCSE	Hyperbaric Chamber Support Equipment
HD	Hard Drive
HDBK	handbook
HDR	High Data Rate
HDRR	High Data Rate Recorder
HDTV	high definition television
HDW	hardware
He	helium
HEAO	High Energy Astronomy Observer
HECA	Hyperbaric Environmental Control Assembly
HEDS	Human Exploration and Development of Space
HEO	High Earth Orbit
HEPA	High-Efficiency Particulate Air
HETGS	High-Energy Transmission Grating Spectrometer
HF	High Frequency
HFE	Human Factors Engineering
HFS	high fidelity simulator
HFSM	high fidelity simulation model
Hg	Mercury
HGA	High-Gain Antenna

HGPCA	Hyperbaric Gas Pressurization Control Assembly
HHL	Hand-held Lidar
HI-FI	High Fidelity
HI-REL	High Reliability
HIRL	Hypervelocity Impact Research Facility
HIT	Horizontal Integration Team
HIT-F	Hypervelocity Impact Test Facility
HLA	high level analog
HLA	Hyperbaric Lighting Assemblies
HLCM	High Level Control Module
HLLV	Heavy Lift Launch Vehicle
HLS	hyperbaric lighting set
HMC	Hydrogen Master Clock
HMD	head/helmet mounted device
HMD	helmet-mounted display
HME	heat and moisture exchange
HMF	Health Maintenance Facility
HMFWS	Health Maintenance Facility Workstation
HMIF	Human-Machine Interface
HMMR	High-Resolution Multifrequency Microwave Radiometer
HMO	Habitat Module Outfitting

HMOS	Habitat Module Outfitting System
HO	hydrogen/oxygen
HOL	High-Order Language
HOSC	Huntsville Operations Support Center
HOU	Houston
HOW	hand-over word
HPA	High Power Amplifier
HPBID	Host Processor/Bus Interface Dedicated
HPBIG	Host Processor/Bus Interface Global
HPF	Hazardous Processing Facility
HPORS	High Pressure Oxygen Recharge Subsystems
HPSI	Human-Ported System Interface
HQ	Headquarters
HQUL	Hardware Quantity and Usage List
HR	Human Resources
HR&T	Heat Rejection and Transport
HRC	High Resolution Camera
HRD	high rate demultiplexer
HRDL	high rate data link
HRDM	high rate demultiplexer/multiplexer
HRF	Human Resource Facility

HRF	Human Research Facility
HRFM	high-rate frame multiplexer
HRM	high rate modem
HRMA	High-Resolution Mirror Assembly
HRPT	High-Resolution Picture Transmission
HRR	Human Resource Representative
HRS	heat rejection subsystem
HRS	High-Resolution Spectograph
HRT	High-Resolution Tracker
HRTS	High-Resolution Telescope Spectrograph
HSD	Hamilton Standard Division
HSE	Hyperbaric Support Equipment
HSI	hardware and software integration
HSO	Habitation and Station Operations
HSP	High-Speed Photometer
HST	Hubble Space Telescope
HSTA	Harris System Testability Analyzer
HT	high temperature
HTC	Human-Tended Capability
HTF	Horizontal Test Facility
HTLPS	High Temperature Liquid Phase Sintering

HTS	heat transport subsystem
HTV	H-II Transfer Vehicle
HUD	Heads-Up Display
HUM	humidity
HUT	hard upper torso
HVI	hypervelocity impact
HVPI	High Voltage Plasma Interaction
HW	hardware
HW/SW	hardware/software
HWCI	hardware configuration item
HWQA	Hardware Quality Assurance
HX	heat exchanger
Hz	hertz
I&A	installation and assembly
I&T	integration and test
I/F	interface
I/O	input/output
IA	Independent Assessment
IA	information architecture
IAARD	integrated Avionics Architecture, Requirements and Design
IAC	Integrated Assembly & Checkout

IACO	installation, assembly, and check out
IACO	integration and checkout
IACO	integration and checkout operations
IACP	Integrated Assembly and Configuration Panel
IAF	International Aeronautical Federation
IAH	inertial attitude hold
IAM	Information Asset Management
IAR	Independent Annual Review
IAR	integrated avionics racks
IAS	Internal Audio Subsystem
IATCS	Internal Active Thermal Control System
ICAM	Integrated Computer Aided Manufacturing
ICAP	Integrated Configuration Assessment Panel
ICC	Integrated Command and Control
ICC	Instrument Control Center
ICD	interface control document
ICD	instrument control document
ICE	in-circuit emulator
ICN	Integrated Communications Network
ICOM	intercom
ICT	Integrated Communications Team

ICT	Interface Control Tooling
ICWG	Interface Control Working Group
ICWO	intercomponent work order
ID	identification/identify
ID	integrated diagnostics
IDA	Intentional Design Assessment
IDAC	integrated design analysis cycle
IDB	Instrumentation data base
IDD	interface development/division document
IDD	interface design document
IDDR	Incremental/Integrated Detail Design Review
IDE	Interior Design Engineering
IDEAS	Integrated Design and Engineering Analysis Software
IDEF	Integrated Computer-Aided Manufacturing Definition
IDEFO	ICAM Definition Language Zero
IDL/S	Intersite Delivery List/Schedule
IDM	Information & Data Management
IDMM	Intermediate and Depot Maintenance manual
IDP	Interface Development Panel
IDR	Incremental Design Review
IDRD	increment definition requirements document

IDS	Integrated Data Systerns
IDT	interdepartment transfer
IEA	Integrated Equipment Assembly
IEC	International Electrotechnical Commission
IEEE	Institute of Electrical and Electronic Engineers
IELK	Individual Equipment Liner Kit
IEVA	Integrated Extravehicular Activity
IF	intermediate frequency
IF	Integration Facility
IFB	invitation for bid
IFHX	interface heat exchanger
IFM	inflight maintenance
IFS	integrated fluid servicer
IFSP	ITA Fluid Service Pallet
IFSR	Integrated Flight Software Requirement
IG	Inspector General
IGA	Intergovernmental Agreement
IGA	International Governmental Agreement
IGES	Initial Graphic Exchange Specification
IGSE	Instrument Ground Support Equipment
IH/SR	Integrated Hardware and Software Review

IHCP	Increment Hazard Control Plan
IHTC	Interim Human-Tended Capability
IIA	Instrument interface Agreement
IIAP	ISS Independent Assessment Panel
IIDD	integrated information development plan
IIO	Inertial Instrument/Instrumentation Organization/Operation
IISS	Integrated Information Support System
IL	intermediate language
ILE	Intermediate Language Executor
ILE	Intermediate Language Editor
ILP	Integrated Logistics Panel
ILS	Integrated Logistics Support/System
ILSA	Industry Large-Structures Assembly
ILSC	Industry Launch Services - Cryogenic
ILSP	Integrated Logistics Support Plan
ILSS	Industry Launch Services - Storable
ILSWG	Integrated Logistics Support working group
ILTF	in-line test fixture
IM	Institutional Management
IMAD	Information Management Assimilation & Delivery
IMCA	integrated motor control assembly

IMCB	Information Management Control Board
IMD	Integrated Monitoring and Diagnostics
IMMCL	Integrated Master Measurement and Command List
IMS	Information Management System
IMS	Institutional Management System
IMS	Inventory Management System
IMS	ion mobility spectrometry
IMTF	Inflight Maintenance Team
IMU	Inertial Measurement Unit
IMV	intermodule ventilation
INS	Inertial Navigation System
INS	Integrated Nitrogen System
IO	industrial operations
IOC	Initial Operation Capability
IOC	Integrated Operations Configuration
IOC	Initial Operational Capability
IOCU	Input/Output Control Unit
IOCWG	IOC working group
IODB	Input/Output data base
IODP	Incremental Operations Design Panel
IOHA	Integrated Operational Hazards Analysis

IOP	In-Orbit Plane
IOP	Increment Operations Plan
IOP	Input/Output Processor
IOPT	Integrated Operational Procedures and Timelines
IOR	Increment Operations Review
IOS	Integrated Operations Scenario
IP	intermediate processor
IP	Internal Protocol
IP	International Partner
IP	Internet Protocol
IPB	Illustrated Parts Breakdown
IPC	Information Planning Council
IPC	Interprocess Communications
IPCL	Instrumentation Program and Command List
IPD	Integrated Product Development
IPG	Information Planning Group
IPIR	Increment Payload Integration Requirements
IPL	Initial Program Load
IPM	Interprocessor Multiplexer
IPPDR	Interim Program Preliminary Design Review
IPRD	Integrated Payloads Requirements Document

IPRM	Integrated Performance and Risk Management
IPS	Instrument Pointing System
IPSSD	Integrated Program Scheduling Standard Document
IPT	Integrated Product Team
IPT/AIT	Integrated Product Team/Analysis and Integration Team
IPTA	Integrated Propulsion Test Article
IR	ionizing radiation
IR	infrared
IR	ionizing radiation
IR&D	Independent Research and Developrnent
IRB	Inertial Reference Base
IRB	Instrumentation/Relay Board
IRD	interface requirement document
IRDS	Information Resources Dictionary System
IRE	Ionizing Radiation Effects
IREC	Ionizing Radiation Effects Compatibility
IRGW	Intermediate Rate Gateway
IRI	International Reference Ionosphere
IRM	Information Resource Management
IRM	integrated risk management
IRN	Interface Revision Notice

IRP	Integrated Resource Plan
IRR	Interface Requirements Review
IRS	Integrated Resource and Schedule
IRU	In-flight Refill Unit
IRU	Inertial Reference Unit
IRU	IVA Replacement Unit
IRWG	Interface Requirements Working Group
IS	Imaging Spectrometer
IS	Information Systems
ISA	inertial sensor assembly
ISB	Issues Screening Board
ISC	Information Systems Contract
ISD	Information Systems Directorate
ISD	intersite delivering
ISE	integrated station executive
ISF	Industrial Space(s) Facility
ISM	Interstellar Medium
ISO	International Standards Organization
ISPOC	International Safety and Product Assurance Oversight Committee
ISPR	International Standard Payload Rack
ISQR	Institutional Quality and Safety Division

ISR	Interim Systems Review
ISS	International Space Station
ISS	internal secondary structure
ISSA	International Space Station Alpha
ISU	International System Unit
ISV	Integrated Systems Verification
IT&V	integration, test, and validation/verification
IT&VE	Integrated Test and Verification Environment
ITA	Integrated Truss Assembly
ITA	Intelligent Task Automation
ITAC	Integration Trades and Analysis Cycle
ITAC-O	Integration Trades and Analysis Cycle-O
ITAR	International Traffic in Arms Regulation
lTAV	Integrated Truss Assembly Verification
ITCS	Intemal Thermal Control System
ITF	Integration Training Facilities
itoo	Integrated Tactical Operations Organization
ITP	Increment Training Plan
ITS	Integrated Truss Segments
ITS	information transmittal sheet
ITU	Input Terminal Unit

ITVE	integrated test and verification environment
ITVF	Integration, Test, and Verification Facility
IU	interface unit
IUC	Initial User Capability
IUD	ITA utility distribution
IUDP	ITA Utility Distribution Pallet
IUG	Intelligence/Interactive Users' Guide
IUM	Interim Use Manual
IUS	Inertial Upper Stage
IV	intravehicular
IV&V	Independent Verification and Validation
IV-CPDS	Intravehicular Charged Particle Directional Spectrometer
IVA	intravehicular activity
IVACS	Intravehicular Control Station
IVAWG	IVA working group
IVE	Interface Verification Equipment
IVS	internal video subsystem
IVT	Integration, Verification, and Training
IWFS	Integrated Waste Fluids System
IWG	Interface Working Group
IWG	initialization working group

IWGS	Integrated Waste Gas System
IWS	Integrated Water System
JACD	joint accommodation configuration document
JACD	joint architectural control document
JASWG	Joint Safety Assurance Working Group
JCNSP	Joint CSA/NASA Simulation Panel
JCP	Joint Committee on Printing
JDL	job drawing list
JDTRS	Japanese Data Tracking & Relay Satellite
JEA	Joint Endeavor Agreement
JEM	Japanese Experiment Module
JEM-EF	Japanese Experiment Module-Exposed Facility
JEM-PM	Japanese Experiment Module-Pressurized Module
JEMRMS	JEM Remote Manipulator System
JIN	JSC Interface Network
JIS	Joint Integration Schedule/Simulation
JISP	Joint Integrated Simulation Procedures
JLM	Japanese Logistic Module
JMICB	Joint Mission Integration Control Board
JMP	Joint Management Plan
JMSWG	Joint Manifest and Schedules Working Group

JOIP	Joint Operations Interface Plan
JPA	Job Performance Assistance
JPALS	JSC Program Automated Library System
JPDRD	Joint Preliminary Design Requirements Document
JPDRD	Joint Program Definitions and Requirements Document
JPL	Jet Propulsion Laboratory
JPP	Joint Program Plan
JPR	Joint Program Review
JPRCB	Joint Program Requirements Control Board
JRB	Joint Review Board
JRMS	JEM Remote Manipulator System
JSC	Johnson Space Center
JSCDSS	JSC Data Support System
JSCMD	Johnson Space Center Management Directive
JSCMI	JSC Management Instruction
JWG	joint working group
K	thousand
k	kilo
K-Band	Code Elements per Second in Thousands
K-SIM	K-band Simulation
KB	keel bending

KB	keyboard
kb	kilobit
KBE	knowledge based executive
kbps	kilobits per second
kbps	kilobytes per second
KBS	knowledged based system
kbvte	kilobyte
kcal	kilocalorie
keV	kiloelectronvolt
kg	kilogram
kHz	kilohertz (kilocycles per second)
KhSC	Khrunichev State Research and Production Space Center
KIPS	thousand (kilo) instructions per second
km	kilometers
KNOMES	Knowledge-Based Maintenance Expert System
KOPS	thousands of operations per second
KP	key personnel
kPa	kilopascals
Kr	krypton
Kristall	One of the modules of the Mir Orbiting Station
KSA	Ku-Band Single Access

KSAF	K-band, Single Access Forward
KSAR	K-band, Single Access Return
KSC	Kennedy Space Center
KSCAP	KSC area permit
KT	Keel Torsion
Ku	Frequency Sub-Band
Kvant	One of the modules of the Mir Orbiting Station
kVA	kilovolt ampere
kW	kilowatt
kWe	kilowatt (electrical)
kWh	kilowatt hour
L	launch
L&ES	Laser and Electronic System
L&M	Logistics and Maintenance
L/D	lift/drag ratio
la	level absolute
LAB	laboratory module
LABR	large air bearing floor
LACO	Laser Communications
LADAR	Laser Radar
LAMAR	Large-Area Modular Array

LAMR	Large-Aperture Microwave Radiometer
LAN	local area network
LaRC	Langley Research Center
LASS	Logistics Automated Supply Support
LASS	Logistics Automated Support System
LASS	II Logistics Automated Support System II
LAT	Local Area Transport
LB	local bus
lb	pound
lbm	pounds mass
LBNP	Lower Body Negative Pressure
LC	Laboratory Ceiling
LCA	Lab Cradle Assembly
LCA	Loop Crossover Assembly
LCC	Launch Control Center
LCC	Life Cycle Cost
LCCIW	life cycle cost impact worksheet
LCCM	life cycle cost management
LCD	Liquid Crystal Display
LCD	lowest common denominator
LCN	Logistics Control Number

LCN	Logistics Code Number
LCP	Left Circular Polarization
LCP	Letter Change Proposal
LCVG	Liquid Cooling and Ventilation Garment
LD	Luminescence Detector
LDEF	Long-Duration Exposure Facility
LDI	Local Data-Bus Interface
LDIP	Logistics Development Implementation Plan
LDM	Logical Data Model
LDO	Long Duration Orbiter
LDR	Large Deployable Reflector
LDR	Low Data Rate
LDRF	Long-Distance Range Finder
LDS	laser docking sensor
LDU	line of code
LDU	linear drive unit
LEA	Logistics Engineering Analysis
LED	Light-Emitting Diode
LEEC	Laser-to-Electric Energy Conversion
LEM	Logistics Element Manager
LEO	low earth orbit

LESC	Lockheed Electronic Systems Company
LET	Linear Energy Transfer
LETGS	Low-Energy Transmission Grating Spectrometer
LF	laboratory floor
LF	load factor
LF	low frequency
LFF	Large Formation Flyer
LFMR	Low-Frequency Microwave Radiometer
LG	logistics
LGA	low gain antenna
LGG	light gas gun
LIDAR	Laser-Instrument Distance and Range
LIDAR	Light Intensification Detection and Ranging
LIM	Logistics Inventory Management
LIMS	Logistics Inventory Management System
LIOS	local input/output subsystem/subunit
LIS	lightning imaging sensor
LIS	Logistics Information System
LISP	List Process (language)
LL	lighting laboratory
LLA	low level analog

LLC	Limited Life Component
LLC	Logical Link Control
LLCM	Low Level Control Module
LLTV	Low-Light Television
LLVIR	Long-Line Voice Interface Rack
LM	laboratory module
LM	logistics module
LM	Lunar Module
LMF	Light Manufacturing Facility
LMI	Logistics Management Institute
LMRT	Logistics Management Responsibility Transfer
LMS	Lunar Module Simulator
LMSC	Lockheed Missiles and Space Company
LMTR	Logistics Management Responsibility Transfer
LNA	low noise amplifier
LO	laboratory outfitting
LO/FI	low fidelity
LOC	line of code
LOC	Logistics Operations Center
LOE	level of effort
LOG	logistics

LOMC	Logistics Operations Management Center
LOR	Line outage recorder
LOS	line of sight
LOS	loss of signal
LOX	liquid oxygen
LP	laboratory port
LP	Launch Package
LP	Leased Platform
LP/S	Launch Package/Stage
LP/SI	Launch Package/Stage Integration
LPC	Linear Predictive Coding
LPCVD	Low Pressure Chemical Vapor Deposition
LPI	Launch Package Integration
LPIF	Launch Package Integration Facility
LPM	lines per minute
LPM	liters per minute
LPS	Launch Processing System
LPS	Liquid Phase Sintering
LPT	Laser Propulsion Test
LRAS	Logistics Requirements Allocation Sheets
LRD	Low-Rate Demodulator

LRR	Launch Readiness Review
LRS	Laser Reflectance Spectrometer
LRU	land/line/lowest replaceable unit
LS	Laboratory Starboard
LS	Launch Site
LS	Life Support
LS	light shield
LSA	logistics support analysis
LSA	Large Space Antenna
LSA	Launch Services Agreement
LSAP	Launch Site Assembly Plan
LSAPM	Logistics Support Analysis Procedures Manual
LSAR	Logistics Support Analysis Record
LSB	Least Significant Bit
LSC	Large Solar Concentrator
LSE	Laboratory Support Equipment
LSF	Laboratory Support Facilities
LSF	Life Sciences Facility
LSG	Life Sciences Glovebox
LSI	large-scale integration
LSIS	Loral Space Information Systems

LSL	Life Sciences Laboratory
LSLE	Life Sciences Laboratory Equipment
LSM	Life Support Module
LSM	Logistics Support Manager
LSML	Life Science Mini Laboratory
LSP	Laboratory Support Processor
LSP	Logistics Support Plan
LSRF	Life Sciences Research Facility
LSS	life support system
LSSI	logistics support systems and integration
LSSM	Launch Site Support Manager
LSSP	Launch Site Support Plan
LSTE	Large Structure Technology Experiment
LTL	low temperature loop
LTU	load transfer unit
LTV	Logistics Transfer Vehicle
LZP	level zero processing
M	mega
M	million
m	meter
M&CE	Manifesting and Cargo Engineering

M&D	maintenance and depot
M&I	management and integration
M&O	maintenance and operations
M&P	materials and processes
M&T	manufacturing and test
m.d.t.	Mountain Daylight Time
M/D	meteoroid/debris
M/OD	meteoroid/orbital debris
m/s	meters per second
m/s/s	meters per second per second
MA	multiple access
MAA	metal aerosol analyzer
MAAPP	manufacturing assessment and planning package
MAAR	Monthly Associate Administrator's Report
MAC	Maintenance Allocation Chart
MAC	Materials and Coatings
MAC	Maximum Allowable Concentration
MAC	Message Authentication Code
MAF	Master Audit File
MAF	multiple-access forward
MAGIK	Manipulator Analysis, Graphics, and Integrated Kinematics

MALP	Master Alarm Light Panel
MAMS	Microgravity Acceleration Measurement System
MANM	Mir Audible Noise Measurement
MAPS	Maintainability Analysis and Prediction System
MAPSE	Minimum Ada Program Support Environment
MAR	Middeck Accommodations Rack
MAR	multiple-access return
MAS	Module Attach System
MAT	Military Air Transport
MAT	Multiple Access Transponder
MATE	MDM Application Test Environment
Mb	megabit(s)
MB	manned base
Mb/s	megabits per second
MBA	Multiple-Bering Adaptor
mbar	Millibar
MBB	make before break
MBE	Molecular Beam Epitaxial
MBF	Mission Build Facility
MBM	Manual Berthing Mechanism
MBPS	million bits per second

Mbps	megabits per second
MBS	Mobile Remote Servicer Base System
MBSA	main bus switching assembly
MBSU	main bus switching unit
Mbyte	megabyte
MC	manned core
MC	midcourse correction
MCA	Major Constituent Analyzer
MCA	Mission Complement Analysis
MCAD	mechanical computer-aided design
MCAS	Mobile Servicing System (MSS) Common Attach System
MCB	Multilateral Control Board
MCC	Mission Control Center
MCCF	MSS command/control facility
MCCU	Mission Control Center Units
MCDS	Management, Communications, and Data System
MCDS	Multifunction CRT Display System
MCE	MSS Control Equipment
MCNIU	Multicompatible Network Interface Unit
MCP	Materials Control Plan
MCR	Materials Control Requirement

MCS	Maneuver Control Systems
MCS	microbiology safety cabinet
MCS	Motion Control Systems
MCT	Management Control Team
MCU	Mechanism Control Unit
MDA	McDonnell Douglas Aerospace
MDA	Mission Database Application
MDB	mission data base
MDBMS	Medical Data Base Management System
MDC	maintenance data collection
MDC	Manipulation Detection Code
MDCS	Maintainability Data Collection System
MDD	mission description document
MDE	mechanism drive electronics
MDF	Manipulator Development Facility
MDM	multiplexer/demultiplexer
MDMS	Maintenance Data Management System
MDP	Master Development Plan
MDS	Maintenance Diagnostic System
MDT	mean down time
MDU	Medical Development Unit

MEA	mass/energy analysis
MECH	mechanism
MECO	main engine cutoff
MECSLSI	mission equipment cargo support launch site installation
MED	Momentum Exchange Device
MED-FI	medium fidelity
MEDS	Multifunction Electronic Display Subsystem
MEEP	Mir Environment Exposure Payload
MEG	magneto encephalogram
MEK	Methyl-Ethyl-Keytone
MEO	medium earth orbit
MEP	Mission Execution Plan
MER	Mission Evaluation Room
MET	Mission Elapsed Time
MeV	millions of electron volts
MeV	megaelectronvolt
MFC	Multiple Flight Computer
MFED	multifunctional exercise device
MFR	manipulator/mobile foot restraint
mg	milligram
MGBX	microgravity glovebox

MGM/PFT	metabolic gas monitor/pulmonary function tester
MGSE	Mechanical Ground Support Equipment
MGSS	Manned Geosynchronous Spacecraft Servicer
MHAC	Multifrequency High-Gain Antenna Configuration
MHD	magnetohydrodynamics
MHEX	Material Handling Extension
MHz	megahertz
MI	Management Integration
MI	Manufacturing Instruction
MI	modification instruction
mi	mile
MIA	Multiplex Interface Adapter
MIB	medical information bus
MIB	Multilayer Interconnection Board
MIC	Management Information Center
MIC	microphone
MIC	microwave integrated circuit
MICS	Material Inventory Control System
MIDAS	materials in devices as superconductors
MIE	modal identification experiment
MIF	Module Integration Facility

mil	thousandths of an inch
MIL-HDBK	military handbook
MIL-STD	military standard
MILSPEC	military specification
MlLSTAR	Military Strategic/Tactical and Relay Satellite
MIM	microgravity isolation measurement
MIMO	multiple input, multiple output
min	minimum
min	minute
MIO	Management Integration Office
MIP	Maintainability Implementation Plan
MIP	Mission Integration Plan
MIPS	million instructions per second
MIPS	Mir Interface to Payload Systems
MIR	Mission Integration Review
MIRR	Material Inspection and Receiving Report
MIS	Management Information System
MIS	Master Integrated Schedule
MIS	Medical Information System
MiSDE	Mir Structural Dynamics Experiment
MISN	Master Integrated Schedule/Network

MITA	manufacturing integration test assembly
MIUL	Material Identification Usage List
MLA	multilinear array
MLA	multispectral linear array
MLE	maximum likelihood estimation
MLI	multilayer insulation
MLP	Monitored Line Program
MLR	mass loss rate
MLS	Microwave Limb Sounder
mm	millimeters
MM	Momentum Management
MM/OD	micrometeoroid/orbital debris
MMA	module manager application
MMA	multiplexer mating adapter
MMC	Mission Management Computer
MMCH/Y	Mean Maintenance Crew Hours per Year
MMCL	Master Measurements and Command List
MMD	mass-measurement device
MMD	mean mission duration
MMD	Mobile Maintenance Depot
MMDB	Master Measurement Data Base

MMDB	Mission Manifesting Data Base
MMDM	multi multiplexer-demultiplexer
MMDS	Mission Management Data System
MME	man month equivalents
MMH	monomethylhydrazine
mmHg	millimeters of Mercury
MMl	man-machine interface
MML	Master Measurement List
MMMD	micro mass-measurement device
MMMH	mean maintenance man hours
MMP	magnetospheric multiprobes
MMS	Maintenance Management System
MMS	Manufacturing Message Specification
MMS	Momentum Management System
MMS	multimission spacecraft
MMSE	multimission support equipment
MMT	Mission Management Team
MMU	mass memory unit
MO	Management Operations
MO	Module Outfitting
MOA	Memorandum of Agreement

MOD	Miscellaneous Obligating Document
MOD	Mission Operations Directorate
MOD	module outfitting design
MOD/UM	modulated/unmodulated
MODB	Master Object data base
MODIS	Moderate Resolution Imaging Spectrometer
MOI	moment of inertia
MOIWG	Mission Operations and Integration Working Group
MOL	Manned Orbiting Laboratory
MOODS	multiple orbiting objects dynamics simulation
MOP	maximum operating pressure
MOP	Mission Optimization Program
MORES	metal oxide regenerable subsystem
MOT	musculoskeletal overload trainer
MOU	Memorandum of Understanding
MP	maintenance platform
MPA	Maintenance Prompter Application
MPA	multiple payload adapter
MPAC	Multipurpose Application Console
MPAD	Mission Planning and Analysis Division
MPC	multiple-payload carrier

MPDB	Main Power Distribution Board
MPEV	Manual Pressure Equalization Valve
MPLM	Mini-Pressurized Logistics Module
MPP	Material Processing Platform
MPPF	Materials Processing Products Facility
MPRD	maintainability process requirements document
MPS	Main Propulsion System
MPS	Materials Processing in Space
MPS	Materials Processing System
MPS	mechanically pumped system
MPS	Mission Planning System
MPS	Modular Power Subsystem
mps	meters per second
MPSR	mission profile storage and retrieval
MPT	Mission Planning Terminal
MPWG	Mass Properties Working Group
MR	management and resources
MR	management report/review
MR	materials request
MRAD	Mission Requirements and Allocations Document
MRB	Material Review Board

MRCS	MSS Robotics Control Station
MRCS	multiple report creation system
MRD	mission requirements document
MRDB	Mission Requirements Data Base
MRMDF	Multi-use Remote Manipulator Development Facility
MRMS	Mobile Remote Manipulator System
MRS	Medical Restraint System
MRS	mobile remote servicer
MRWG	Mission Requirements Working Group
MS	margins of safety
MS	Mission Specialist
ms	mail stop
ms	rnillisecond
MSA	module structure assembly
MSA	multiuse solar array
MSAD	Microgravity Science and Applications Division
MSB	most significant bit
MSC	Mission Systems Contract
MSC	Mobile Servicing Center
MSCS	Mobile Service Center System
MSD	mass storage device

MSE	maintenance support equipment
MSF	mass storage function
MSFC	Marshall Space Flight Center
MSI	maintenance-significant items
MSI	multisystem integration
MSID	Measurement Stimulation Identification
MSIF	multisystem integration facility
MSIS	Man-Systems Integration Standards
MSRE	Mir Sample Return Experiment
MSS	Mission Specialist Station
MSS	Mobile Servicing System
MST	modular servicing tool
MST	Module System Trainer
MSTL	Man-Systems Telerobotics Laboratory
MSU	mass storage unit
MT	Mobile Transporter
MT&L	manufacturing, test and logistics
MTA	maintenance task analysis
MTB	magnetic torque bar
MTBF	mean time between failures
MTBR	mean time between repairs

MTCT	manipulator/teleoperator control technology
MTE	manual test equipment
MTEM	Mobile Transporter Element Manager
MTIRI	Multispectral Thermal Infrared Imager
MTL	Manufacturing and Technology Laboratory
MTL	Master Time Line
MTL	Materials Technology Laboratory
MTL	moderate temperature loop
MTLO	Moscow Technical Liaison Office
MTP	Master Test Plan
MTS	Mobile Transporter System
MTS	module-to-truss structure
MTTR	mean time to repair/replace
MTTS	mean time to service
MTU	master timing unit
MTV	Manned Transport Vehicle
MUA	Materials Usage Agreement
MUX	multiplexer
mV	millivolt
MVAK	Module Vertical Access Kit
MVP	Master Verification Plan

MVPR	Master Verification Process Requirements
MVR	Master Verification Requirements
MVS	Multiple Virtual System
MVS	Mutual Visual System
MW	microwaves
MWA	Maintenance Work Area
MWG	Maintainability/Measurements Working Group
MWGS	mixed waste gas system
MWNE	Mir Wireless Network Experiment
MWS	maintenance workstation
MWS	mini workstation
MYE	manyear equivalent
Myte/s	megabytes per second
n	neutron
N	Newton(s)
N/A	not applicable/available
N/C	no change
N2	nitrogen
NAC	NASA Advisory Council
NACAIT	Network and Communications Analysis and Integration Team
NAS	node avionics simulator

NASA	National Aeronautics and Space Administration
NASCOM	NASA Communications (network)
NASDA	National Space Development Agency of Japan
NASP	National Aerospace Plane
NASTRAN	NASA Structural Analysis Computer Program
NB	navigation base
NB	neutral buoyancy
NBF	Neutral Buoyancy Facility
NBL	Neutral Buoyancy Laboratory
NBS	National Bureau of Standards
NBS	Neutral Buoyancy Simulator
NBT	Neutral Buoyancy Test
NC	numerically controlled
NC	1 First Phasing Maneuver (Orbiter rendezvous maneuver)
NC(Curve)	noise criteria curve
NCC	Network Control Center
NCC	Nominal Corrective Combination Maneuver
NCCDS	Network Control Center Data System
NCD	number column density
NCEN	Network Compatibility Engineer
NCG	noncondensible gas

NCn	nth Phasing Maneuver
NCRPM	National Council of Radiation Protection and Measurement
NCS	Node Control Software
NDC	notification of document change
NDE	nondestructive evaluation
NDI	nondestructive inspection
NDT	nondestructive test
Ne	neon
NEMS	NASA Equipment Management System
NET	network
NFS	NASA FAR Supplement
NFSD	NASA FAR Supplement Directive
NGT	NASA Ground Terminal
NH	1 First Differential Height Maneuver
NHB	NASA handbook
NHn	nth Differential Height Maneuver
NIA	Network Interface Adaptor
NIE	natural and induced environment
NIEP	Natural and Induced Environments Panel
NIF	network interface function
NIH	National Institutes of Health

NiH2	nickel hydrogen
NIM	Network Integration Manager
NIMS	NASA Interface Monitoring System
NIPS	NASA Interactive Planning System
NIR	nonionizing radiation
NISI	network and information system integration
NIST	National Institute of Standards and Testing (formerly NBS)
NIU	Network Interface Unit
NLT	not less than
NM	network management
nm	nanometer
NMI	NASA Management Instruction
nmi	nautical mile
NMLO	NASA Moscow Liaison Office
NOA	New Obligation Authority
NOA	notice of availability
NOS	Network Operating System
NOSP	Network Operations Support Plan
NPD	NASA Program Directive
NPR	National Performance Review
NPSS	NASA Packet Switching System

NR	not required
NRC	National Research Council
NRT	nonreal time
NRZ	not return to zero
NSA	National Security Agency
NSA	Node Switching Assembly
NSCORT	NASA Specialized Centers of Research and Training
NSE	Network Simulations/Systems Engineer
NSF	National Science Foundation
NSIS	NASA Software Information System
NSN	National Stock Numbers
NSP	NASA Support Plan
NSPAR	Nonstandard Part Approval Request
NSRML	Naval Submarine Research Medical Laboratory
NSRS	NASA Safety Reporting System
NSS	NISI Security Subpanel
NSS/GO	NASA Safety Standards/Ground Operations
NST	Node Systems Trainer
NSTL	National Space Technology Laboratory
NSTS	National Space Transportation System (Do Not Use--use SSP)
NSU	Node Switching Unit

NTA	network test adapter
NTA	Nitrogen tank assembly
NTE	not to exceed
NTO	nitrogen tetroxide
NTSC	National Television Standards Committee
NTTF	Network Test and Training Facility
NWAN	NASA Wide Area Network
O&C	operations and checkout
O&M	operations and maintenance
O&R	operations and robotics
O&SHA	Operating and Support Hazard Analysis
O&U	operations and utilization
O&UCB	Operations and Utilization Control Board
O/A	operations/administrative
O/D	on dock
O2	oxygen
OA	office automation
OACT	Office of Advanced Concepts and Technology
OAS	Orbiter Attachment System
OASIS	Orbiter Avionics to Station Interface System
OAST	Office of Aeronautics and Space Technology

OATS	Optical Alignment Transfer System
OB	octave band
OBC	onboard computer
OBCO	onboard check out
OBCP	Onboard Computer Program
OBCS	Onboard Computer System
OBS	Operational Bioinstrumentation System
OBS	Organization Breakdown Structure
OBT	onboard training
OCA	Overall Configuration Analyses
OCC	Operations Control Center
OCP	Office of Commercial Programs
OCP	Operations Control Panel
OCR	Operations Capability Reference/Review
OCR	Optical Character Reader
OCS	Operations and Control Software
OCS	Operational Control Segment
OCS	Onboard Computer System [Russian]
OCZ	Operational Control Zone
OD	outside diameter
ODB	Operations Data Base

ODBMS	Onboard Data Base Management System
ODC	other direct charge
ODC	V/A other detailed cost value/added
ODF	Operations Data File
ODIN	onboard data interfaces and network
ODM	operational data message
ODRS	Orbital Decay and Reboost Simulation
ODS	Orbiter Docking System
OE	operating envelope (OMS term)
OEL	Operational Events List
OEM	original equipment manufacturer
OETC	Oversized Element Transportation Cradle
OF	outfitting
OFDS	operations flight design system
OFP	Operational Flight Profile
OFPP	Office of Federal Procurement Policy
OFT	Orbital Flight Test
OGE	objective grating electronics
OHA	operating hazards analysis
OI	operational instrumentation/increment/integration
OI	operations integration

OIP	Operations Integration Panel
OIS	Operational Intercommunication System
OISR	Open Item Status Report
OIU	Orbiter Interface Unit
OJT	on the job training
OLIPSE	Optizon Liquid Phase Sintering Experiment
OLSD	off-line storage device
OMA	Operations Management Application
OMB	Office of Management and Budget
OMCF	Orbiter Maintenance & Checkout Facility
OMGA	Operations Management Ground Application
OMIS	Operations and Maintenance Information System
OMLC	Operations Management & Logistics Center
OMM	Orbital Maintenance Mission
OMP	Operations and Maintenance Plan
OMRS	Operations and Maintenance Requirements and Specifications
OMS	Orbital Measuring System
OMS	Orbital Maneuvering System
OMV	Orbital Maneuvering Vehicle
OMWS	Orbiter Maintenance Workstation
OOCI	OSTP/ODF crew interface

OOD	object oriented design
OOS	On-orbit Operations Summary
OP	operation
OP	Operational Processing
OP	Operations Panel
OPAS	Operations Planning and Analysis Systems
OPB	Operations Program Baseline
OPF	Orbiter Processing Facility
OPM	Optical Properties Monitor
OPR	Office of Primary Responsibility
OPS	Operations Planning System
OPS	operations
ORA	Operational Requirements Analysis
ORACLE	a software data base tool
ORD	Operations Requirements Document
ORI	Operational Readiness Inspection
ORLA	optimum repair-level analysis
ORR	Operational Readiness Review
ORU	Orbital Replacement Unit
OS	Operating System
OS	Operations Support

OS	Orbital Station
OSA	Orbiter-based Station Avionics
OSAR	Operations Suitability Assessment Report
OSC	Operations Support Center
OSE	orbital support equipment
OSF	Office of Space Flight
OSHA	Occupational Safety and Health Administration
OSI	open system interconnection
OSID	Operating System Interface Definition
OSPL	overall sound pressure level
OSR	Operational Safety Review
OSSE	Oriented Scintillation Spectrometer Experiment
OSTP	Office of Science and Technology Policy
OSTP	onboard short term Plan
OSU	On-Orbit Serviceable Unit
OSVS	Orbiter Space Vision System
OT&E	operational test and evaluation
OTA	Optical Telescope Assembly
OTC	over the counter
OTCM	ORU/Tool Changeout Mechanism
OTDA	Office of Tracking and Data Acquisition

OTS	off-the-shelf
OTU	Output Terminal Unit
OTV	Orbital Transfer Vehicle
OUCD	Operations and Utilization Capability Development
OWS	Operations Workstation
p	pressure
P	platform
p	proton
P	port
P&SA	Payload and Servicing Accommodations
P&W	particle and waves
P-MPAC	Portable Multipurpose Application Console
P-V	power voltage
p.d.t.	Pacific Daylight Time
p.s.t.	Pacific Standard Time
P/L	payload
P/N	part number
PA	power amplifier
PA	Product Assurance
PAAR	Product Assurance Action Report
PAB	Parts Advisory Board

PABF	Precision Air Bearing Floor
PAD	program approval document
PADS	Product Assurance Data System
PAE	Payload Attached Equipment
PAFAM	Performance and Failure Assessment Monitor
PAH	Payload Accommodations Handbook
PAI	payload analytical integration
PAIM	Product Assurance Integration Manager
PAIT	Program Analysis and Integration Team
PALS	Program Automated Library System
PAM	Payload Assist Module
PAM	Payload Accommodation Manager
PAP	Payload Activity Plan
PAPL	Program Approved Parts List
PAPR	Product Assurance Program Representative
PARS	Property Accountability Record System
PASDE	Photogrammetric Appendage Structural Dynamics Experiment
PASR	Product Assurance Source Representative
PATS	Payload Avionics Test Station
PAYCOM	Payload Command
PAYDAT	payload data

PBA	Portable Breathing Apparatus
PBA	pressurized berthing adapter
PBM	pressurized berthing module
PC	personal computer
PC	plasma contactor
PC	printed circuit
PCA	payload control areas
PCA	Pressure Control Assembly
PCA	Procurement Configuration Audit
PCA	Program Commitment Agreement
PCB	Parts/Program Control Board
PCB	Payload Control Board
PCC	Platform Control Center
PCC	Program Coordination Committee
PCG	protein crystal growth
PCI	product configuration identification
PCM	phase change material
PCM	program cost management
PCMCIA	Portable Computer Memory Card International Adapter
PCR	Payload Certification Review
PCR	Portable Computer Receptacle

PCS	Portable Computer System
PCTS	Program Correspondence Tracking System
PCU	power conditioning unit
PCU	Power Conversion Unit
PD	passive damper
PD	program directive
PDA	Portable Diagnostic Analyzer
PDA	Power Distribution Assembly
PDA	pressurized docking adapter
PDAP	Portable Data Acquisition Package
PDBD	Preliminary Design Baseline Directives
PDCA	power distribution and control assembly
PDCS	Procedure Development and Control System
PDCU	Power Distribution Control Unit
PDDR	product definition data requirements
PDGF	power and data grapple fixture
PDIP	Payload Data Interface Panel
PDL	Program Design Language
PDM	pressurized docking mast/mechanism
PDM	Program Development Methodology
PDMA	Pressurized Docking Mating Adapter

PDMS	Payload Data Management System
PDO	Performance Determination Official
PDP	Programmable Display Pushbutton
PDR	Preliminary Design Review
PDRD	Program Definition and Requirements Document
PDRS	payload deployment retrieval system
PDS	PRACA Data System
PDSS	Payload Data Services System
PDU	power distribution unit
PDU	prototype development unit
PDV	predelivery verification
PE	Photometer Electronics
PE	plasma effects
PE	preceding event
PEB	Performance Evaluation Board
PEC	Performance Evaluation Committee
PEC	plasma effects compatibility
PEC	Proposal Evaluation Committee
PEDB	Payload Engineering Data Base
PEHG	Payload Ethernet Hub Gateway
PEM	plastic encapsulated microcircuits

PEO	Polar Earth Orbit
PEP	Portable Emergency Provisions
PEP	Program Execution Plan
PERB	Performance Evaluation Review Board
PERT	Program Evaluation Review Technique
PET	phase elapsed time
PF	platform
PF	protoflight
PFCS	Pump/Flow Control Subassembly
PFE	portable fire extinguisher
PFM	pulse frequency modulation
PFR	Portable Foot Restraint
PFU	parts followup
PG	product group
PGHM	payload ground-handling mechanism
PGOC	Payload Ground Operations Contractor
PGSC	Payload General Support Computer
PGSE	payload ground-support equipment
PGU	Plant Growth Unit
PH	personal hygiene
pH	measure of acidity

PHA	Preliminary Hazard Analysis
PHC	Permanent Human Capability
PHCP	Payload Hazard Control Plan
PI	payload integrator
PIA	Payload Interface Adapter
PIA	Program Initiation Agreement
PIC	plume impingement contamination
PID	prime item development
PIDG	proportional, integral, and differential gain
PIE	Particle Impact Experiment
PIM	Payload Integration Manager
PIMS	Payload Information Management System
PIMS	Plasma Integration Monitoring System
PIND	particle impact noise detection
PIO	Program Integration Office
PIO	provisioned item order
PIP	Payload Integration Plan
PIRN	Preliminary/Proposed Interface Revision Notice
PIT	preintegrated truss
PIU	Power Interface Unit
P/LC	payload compartment

PL/PL	prelaunch/postlanding
PLAN	Payload Local Area Network
PLB	payload bay
PLC	pressurized logistic carrier
PLH	Payload Handling
PLM	payload/pressurized logistics module
PLSS	Payload Support Structure
PLSS	Portable Life Support System (subsystem)
PLSS	Primary Life-Support System
PLT	pilot
PM	Performance Monitor
PM	pressurized module
PM	preventive maintenance
PM	program manager
PM	propulsion module
PMA	platform management application
PMA	pressurized mating adapter
PMA	pump module assembly
PMAA	propulsion module attach assembly
PMAD	Power Management and Distribution
PMAS	Propulsion Module Attach Structure

PMB	Performance Measurement Baseline
PMC	Power Management Controller
PMCU	Power Management Controller Unit
PMDS	Power Management and Distribution System
PMDU	propulsion module development unit
PMM	Property Management Manual
PMM	Propulsion Module Manager
PMP	parts, materials, and processes
PMP	Program Management Plan
PMPAC	Portable Multipurpose Application Console
PMPP	Preventive Maintenance Prediction Program
PMR	Program Manager's Review
PMRS	Partial Medical Restraint System
PMS	Performance Measurement System
PMS	Platform Management System
PMS	Polar Meteorological Satellite
PMS	Program Master Schedule
PMSR	Performance Measurement System Report
PMV	pressure monitoring valve
PN	pseudonoise
PNP	Preliminary Network Plan

PNP	prenegotiation position
PNP	probability of no penetration
PO	Program Office
PO	purchase order
POC	point of contact
POCC	Payload Operations Control Center
POCRFC	Proof-of-Concept Rotary Fluid Coupler
PODF	Payload Operations Data File
POIC	Payload Operations Integration Center
POIF	payload operation integration function
POL	paints, oils, and lubricants
POP	period of performance
POP	perpendicular-to-orbit plane
POP	Program Operating Plan (POP-96)
POP/IOP	Program Operating Plan/Institution Operating Plan
POPIS	proximity operations plume impingement simulation
pos	position
POST	power-on self test
POV	proximity operations vehicle
POWS	Program Operating Work Statement
POZ	Proximity Operations Zone

PP	program procedure
PP	project plan
PP&C	Program Planning and Control
PPA	Pump Package Assembly
PPAL	Preliminary Preferred Parts List
PPCO2	partial pressure of carbon dioxide
PPF	Payload Processing Facilities
PPFR	Powered Portable Foot Restraint
PPL	Plant Physiology Laboratory
PPM	primary propulsion manager
ppm	parts per million
PPO2	partial pressure oxygen
PPOC	Platform Payload Operations Center
PPOP	Platform Payload Operations Plan
PPR	Payload Preparation Room
PPRV	positive pressure relief valve
PPS	Payload Pointing System
PQA	program quality acceptance
PR	Purchase Request
PR&A	Program Requirements and Assessment
PRA	Probabilistic Risk Assessment

PRAB	Program Risk Assessment Board
PRACA	Problem Reporting and Corrective Action
PRAD	Processor Resource Allocation Document
PRCB	Program Requirements Change Board
PRCS	Primary Reaction Control System
PRD	Program Requirements Document
Priroda	One of the modules of the Mir Orbiting Station
PRL	Program Requirements List
Progress	Russian unmanned resupply vehicle for Mir
PRP	personnel reliability program
PRR	Preliminary/Program Requirements Review
PS	payload scientist/specialist
PS	Personal System
PS	Platform Servicing
PS/2	Personal System/2
PSA	Preliminary Safety Analysis
PSA	provisions storage assemblies
PSAT	Predicted Site Acquisition Table
PSC	Payload Steering Committee
PSC	Platform Support Center
PSC	Program Support Communications

PSCN	Program Support Communications Network
PSCN/I	Program Support Communications Network/Interface
PSCRD	Program Support Communications Requirements Document
PSF	Power Systems Facility (LeRC facility)
psi	pounds per square inch
psia	pounds per square inch absolute
psig	pounds per square inch gage
PSL	Parts Selection List
PSM	Program Staff Manager
PSP	Program Support Plan
PSRP	Payload Safety Review Panel
PSS	Payload Specialist Station
PSS	Planning and Scheduling System
PSS	Polar Subsurface Sounder
PST	Planetary Spectroscopy Telescope
PT	push-to-talk
PTA	prototype test article
PTA	propellant tank assembly
PTC	payload training cabability
PTCS	Passive Thermal Control System/Subsystem
PTFE	Polytetrafluorethylene (Teflon)

PTI	programmed test input
PTOP	Platform Transfer Operations Plan
PTP	payload tactical planning
PTR	Port Thermal Radiator
PTS	permanent threshold shift
PTS	Precise Time System
PTTI	precise time and time interface
PTU	pan tilt unit
PUP	Payload Utilization Plan
PV	photovoltaic
PVC	photovoltaic control
PVCU	photovoltaic controller unit
PVM	photovoltaic module
PVR	photovoltaic radiator
PVTCS	Photovoltaic Module Thermal Control System
PWA	printed wiring assemblies
PWB	printed wiring board
PWC	primary/program work code
PWP	Portable Water Processor
PWP	portable work platform
pwr	power

PWS	Portable Work Station
PY	program year
q	quality factor
QA	quality assurance
QAI	Quality Assurance Instruction
QD	quick disconnect
QDR	Quality Discrepancy Report
QF	Quality Factor
QM/FM	qualification model/flight model
QML	qualified manufacturing line
QMR	Quick Medical Reference
QPSK	Quadriphase Shift Key
QS	Quality System
QSA	Qualification Site Approval
QSD	Quality Support/Systems Division
QTA	Qualification Test Article
QTP	Qualification Test/Procedure
R&D	research and development
R&M	reliability and maintainability
R&QA	reliability and quality assurance
R&T	research and technology

Ra	radium
RACU	Russian-American Converter Unit
RAD	Radiation Absorbed Dose
RADALT	radar altimeter
RAFP	Resource Allocation & Functional Partitioning
RAFPP	Resource Allocation & Functional Partitioning Panel
RAM	random access memory
RAM	Responsibility Assignment Matrix
RAMIS	Rapid-Access Management Information System
RAMPAT	Reliability and Maintainability Prediction and Notification Tool
RAN	Resource Allocation Notice
RAS	reference assembly sequence
RB	radiator bending
RBC	Recoverable ballistic capsule
RBDA	reliability block diagram analysis
RBE	relative biological effectiveness
RBI	Remote Bus Isolator
RC	Reference Configuration
RC	ring concentrator
RCB	Requirements Change Board
RCM	reliability centered maintenance

RCS	Reaction Control System/Subsystem
RCU	remote control unit
RCU	ring concentrator unit
RD	radiator drive
RD	Rocketdyne
RDA	Recommended Dietary Allowance
RDB	Relational/Requirements Data Base
RDC	Regional Data Center
RDCS	Reconfiguration Data Collection System
RDD	requirements definition document
RDMA	Risk Data Management Application
RDRM	Return Data Relay Measurement
RDT&E	research, development, test, and engineering
RECP	request for engineering change proposal
REE	Responsible Equipment Engineer
REF	reference
REFCON	Reference Configuration
REM	rocket engine module
REM	Roentgen Equivalent Man (unit of dost equivalent)
REV	revision
RF	radio frequency

RFA	request for action
RFC	regenerative fuel cell
RFC	rotary fluid coupler
RFCA	rack flow control assembly
RFCT	ready for crew training
RFD	request for deviation
RFF	request for flight
RFI	radio frequency interference
RFI	request for information
RFM	Redundancy and Fault Management
RFMD	rotary fluid management device
RFP	request for proposal
RFPG	Radio Frequency Protection Guides
RFQ	request for quotations
RGA	Rate Gyro Assembly
RGP	rate gyro package
RGPS	Relative Global Positioning System
RGS	Russian Ground Segment
RHC	right hand circular
RHC	Rotational Hand Controller
RI	Rockwell International

RIA	Rack Interface Agreement
RID	review item discrepancy/disposition
RIF	request for information
RIM	Relational Information Management
RJCC	rotor joint command and control
RJE	remote job entry
RJM	resistojet module
RJMC	rotary joints motor controller/coupler
RLA	repair level analysis
RLG	ring laser gyro
RLLS	Russian Language and Logistics Support
RLSC	Russian Language Services Contract
RLV	Reusable Launch Vehicle
RM	remote manipulator
RM	Redundancy/Resource Management
RM	Research Module
RMAT	Reliability and Maintainability Assessment Tool
RMDU	remote multiplexer/demultiplexer unit
RME	Risk Mitigation Experiment
RME	responsible maintainability engineers
RMPS	Remote Manipulator Planning System

RMS	rate monotonic scheduling
RMS	record management system
RMS	remote manipulator system
RMS	Risk Management System
RMS	root mean square
RN	resource node
RNA	ribonucleic acid
RNIU	Remote/Redundant Network Interface Unit
ROAM	robotics ORU assembly and maintenance
ROC	Regional Operations Center
ROD	record of discussion
RODB	Runtime Object Data Base
ROEU	remotely operable electrical umbilical
ROM	read only memory
ROM	rough order of magnitude
ROS	regulated oxygen supply
ROS	removable overhead structure
ROS	Russian Orbital Segment
ROTV	Reusable Orbiter Transfer Vehicle
RPC	remote power converter/controller
RPCM	remote power control mechanism

RPDA	remote power distribution assembly
RPDP	Recoverable Plasma Diagnostics Package
RPF	Robotics Planning Facility
RPL	Rodent and Primate Laboratory
RPS	Remote Planning System
RPSA	Recovery Procedure Selection Application
RPV	Remotely Piloted Vehicle
rqmt	requirement
RR	Rendezvous Radar
RRMD	Realtime Radiation Monitor Device
RS	reference standard
RS	Robotic Servicer
RS	Russian Segment
RSA	Russian Space Agency
RSC	Remote Service Center
RSC-E	Rocket Space Corporation-Energia
RSIS	Robotic Systems Integration Standards
RSS	root-sum-square
RSS	Rotating Service Structure
RST	Russian Segment Trainer
RSU	rate sensor unit

RSU	roller suspension unit
RT	remote terminal
RTE	Real/Run Time Environment
RTG	Radioisotope Thermoelectric Generator
RTHC	rotation translation hand controller
RTL	Responsible Task Leader
RTLS	return to launch site
RTM	Requirements Traceability Manager
rtn	return
RTOP	Research and Technology Objectives and Plans
RTS	real-time subsystem
RTS	RID Tracking System
RTV	Room-Temperature Vulcanized
RUM	remote unit manipulator/monitor
RUPSM	Resource Utilization Planning/Systems Model
RUR	Reference Update Review
RV	routine verification
RW	roll wrapping
RWA	Reaction Wheel Assembly
RWAM	Reaction Wheel Assembly Module
RWG	Robotics Working Group

RWS	remote workstation
Rx	receiver
s	segment
S	Starboard truss segment
S0	Starboard truss segment 0
S&E	sensors and effectors
S&M	structures and mechanisms
S&MA	safety and mission assurance
S&S	status and scheduling
S&TC	Science and Technology Center
S&U	science and utilization
S-SIM	S-Band Simulator
S/C	spacecraft
S/DTA	structural/dedicated test article
S/G	space-to-ground
S/M	structures/mechanisms
S/N	serial number
S/S	subsystem
S/W	software
SA	selective availability
SA	single access

SA	Solar Array
SA	supplemental assembly
SAA	South Atlantic anomaly
SAA	subsystem architecture and analysis
SAAM	Science and Applications Mission
SAB	Space Applications Board
SABB	solar array blanket boxes
SAE	Solar Array Experiment
SAEPL	Space Station Approved EEE Parts List
SAES	Solar Array Electrical Simulator
SAFER	simplified aid for EVA rescue
SAGE	Stratospheric Aerosol and Gas Experiment
SAI	Systems Application Integration
SAIS	Science & Application Information System
SAM	servicing and maintenance
SAMS	Space Acceleration Measurement System
SAP	Service Access Point
SAR	Safety Analysis Report
SAR	software architecture review
SAR	specific absorption rate
SAR	synthetic aperture radar

SARJ	solar alpha rotary joint
SAS	Solar Array Simulator
SAS	Statistical Analysis System
SASE	Specific Application Software Elements
SAT	Servicing Aid Tool
SAT	single access transmitter
SATE	SDP application test environment
SATS	Satellite Automated Test System
SATS	Station Accommodation Test Set
SB	S-band
SB	small business
SBA	Small Business Administration
SBA	space-based antenna
SBAR	space-based antenna range
SBB	Satellite Busy Box
SBF	single barrier failure
SBL	space-based laser
SC	segment control
SC	stage/system configuration
SC	station commander
SCA	Shuttle Carrier Aircraft

SCARA	schedule, cost, and risk assessment
SCAT	scatterometer
SCAT	System Commonality Analysis Tool
SCBA	self contained breathing apparatus
SCD	specification control drawing
SCDR	Safety Compliance Data Report
SCE	signal conditioning equipment
SCG	Security Classification Guide
SCG	Solar Concentrator Group
SCIM	standard cubic inches per minute
SCL	space component lifetime
SCM	Software Configuration Management
SCM	spacecraft materials
SCM	space cargo modified
SCMA	Station Configuration Monitoring Application
SCN	Specification Change Notice
SCP	Systems Control Panel
SCPMP	Station Crew Procedures Management Plan
SCR	Schedule Change Request
SCR	solar cosmic radiation
SCR	space constructible radiator

SCR	system conceptual requirements
SCS	Satellite Control Section
SCSI	Small Computer System Interface
SCTF	Sonny Carter Training Facility
SD	support development
SD	solar dynamics
SDB	small disadvantaged business
SDD	software design documentation
SDD	software design document
SDDD	Software Detail Design Document
SDDP	Solar Dynamic Demonstration Project
SDDU	System Development and Diagnostic Unit
SDE	Software Development Environment
SDFD	Solar Dynamic Flight Demonstration
SDIL	Software Development Integration Lab
SDIO	serial digital input/output
SDIO	Strategic Defense Initiative Organization
SDIP	Systems Design and Integration Panel
SDLC	synchronous data link communication
SDLT	static/dynamic load technology
SDLV	Shuttle-Derived Launch Vehicle

SDM	Solar Dynamic Module
SDM	Subsystem/System Development Manager
SDO	solenoid driver output
SDOM	Station Development and Operations Meeting
SDP	Safety Data Package
SDP	Software Development Plan
SDP	Standard Data Processor
SDP	Standard/System Data Processor
SDPF	Science Data Processing Facility
SDR	Software Design Requirements
SDR	System Design Review
SDS	Satellite Data System
SDT	System Design Team
SDTN	Space and Data Tracking Network
SDV	Shuttle-Derived Vehicle
SE	Spectrometer Electronics
SE	support environment
SE	support equipment
SE	system engineer
SE&A	System Engineering and Analysis
SE&I	system engineering and integration

SEAD	Space Station Early Assembly Demonstration
SEASAR	Sea Synthetic Aperture Radar
SEASAT	Sea Surveillance Satellite
SEB	Source Evaluation Board
sec	second
SEDB	Support Equipment Data Base
SEE	single event effect
SEI	support equipment installation
SEID	support equipment item description
SEIR	Support Equipment Item Requirement
SEL	Systems Engineering Laboratory
SEM	Scanning Electron Microscopy
SEM	Sustaining Engineering Manager
SEM	System Engineering Manager
SEMP	Systems Engineering Management Plan
SEMS	Systems Engineering Master Schedule
SEMU	Short Extravehicular Mobility Unit
SEP	solar electric propulsion
SEP	solar energetic particles
SEPAC	Space Experiments with Particle Accelerators
SEPS	secondary/solar electric power system

SERD	support equipment requirements document
SERR	Support Equipment Requirements Review
SERS	Space Erectable Radiator System
SES	Shuttle Engineering Simulator
SES	Systems Engineering/Evaluation Simulator
SESA	Support Element Selection Algorithm
SESL	Space Environment Simulation Laboratory
SETI	Search for Extraterrestrial Intelligence
SEU	single-event upset
SEUL	Support Equipment Utilization List
SF	Servicing Facility
SF	standard form
SFA	Small Fine Arm
SFCA	System Flow Control Assembly
SFDF	Station Flight Data File
SFDR	System Functional Design Review
SFE	smart front-end
SFE	Static Feed Electrolysis
SFF	Small Formation Flyer
SFHe	superfluid helium
SFM	Service Facility Manipulator

SFP	single failure point
SFP	Summary Flight Plan
SFPS	Single Failure Point Summary
SFTA	software fault tolerance analysis
SFU	Space Flyer Unit
SGAC	space-to-ground antenna controller
SGANT	space-to-ground antenna
SGBSP	space-to-ground baseband signal processor
SGE	Strain Gage Electronics
SGL	space-to-ground link
SHA	system hazard analysis
SHAPES	Spatial, High-Accuracy Position Encoding Sensor
SHARE	Station Heatpipe Advanced Radiator Element
SHF	S-band high frequency
SI	science instrument
SI	solar inertial/intensity/international
SI	International System of Units
SI&A	Systems Integration and Avionics
SI&T	Software Integration & Test
SIA	solar inertial attitude
SIA	standard interface adapter

SIA	Station Interface Adapter
SIB	simulation interface buffer
SIB	Systems Integration Board
SIC	Standard Industrial Classification
SIC	Standard Interface Connector
SICDH	Scientific Instrument Computer and Data Handling
SID	selected item drawing
SID	Simulator Interface Device
SID	standard interface docurnent
SIDD	Servicing Implementation Definition Docurnent
SIF	Software Integration Facility
SIF	System Integration Facility
SIGAda	special interest group on Ada
SIL	Speech Interference Level
SIL	system integration laboratory
SIM	simulation
SIM	System Integration Manager
SIMS	Shuttle Inventory Management System
SINDA	Systems Improved Numerical Differencing Analyzer
SiO2	silicon dioxide
SIP	Strategic Information Plan

SIP	systems integration panel
SIPE	Scientific Instrument Protection Enclosure
SIPS	Simulation Interface & Processing System
SIS	Simulator Interface Subsystem
SIT	Software Integration Test
SIVT	system integration verification and test
SL	Space Lab
SLA	Scanning Laser Altimeter
SLASER	Space Laser
SLAW	Station Logistics Analysis Worksheet
SLC	Shuttle Launch Complex
SLC	specialized logistics carrier
SLD	Simulated Launch Demonstration
SLDPF	Spacelab Data Processing Facility
SLED	System-Level Engineering Documentation
SLF	Shuttle Landing Facility
SLIC	Systems and Logistics Integration Capability
SLOC	source/standard lines of code
SLS	Spacelab Life Sciences
SLSD	Space and Life Sciences Directorate
SLSR	Service Level Status Report

SM	Service Module
SM	system manager/management
SM&C	Station Management and Control
SM&F	Structures, Mechanical and Fluid Systems
SMA	Science Monitoring Area
SMAC	Spacecraft Maximum Allowable Concentration
SMAIT	Subcontractor Management Analysis & Integration Team
SMAP	Software Management and Assurance Program
SMART	Safety and Mission Assurance Review Team
SMARTS	Spacecraft Mission Analysis Real-Time Simulator
SMASE	Shuttle/Mir Alignment Stability Experiment
SMCE	Secondary Mirror Control Electronics
SMCH	standard mixed cargo harness
SMD	Structures and Mechanics Division
SMF	Space Medical Facility
SMF	Superconducting Magnetic Facility
SMMD	Small Mass Measurement Device
SMP	Security/Software Management Plan
SMPT	Shuttle Main Propulsion Test
SMR	source, maintainability and recoverability
SMR	supportability, maintainability, and repairability

SMS	Separation Mechanism Subsystem
SMS	Service Manipulator System
SMS	Shuttle Mission Simulator
SMTF	Shuttle Mission Training Facility
SN	space network
SNA	Shaping Network Assembly
SNA	System Network Architecture
SNDU	Standard Network Data Unit
SNLDU	standard network layer data unit
SNS	SSIS Network Simulator
SO	station operator
SOA	systems operability assessment
SOC	System Operating Concept
SOD	start of development
SOD	statement of direction
SODB	Space Shuttle Operations Data Book
SODF	Systems Operations Data File
SOHO	Solar Heliosphere Observatory
SOP	Safety Operating Procedure
SOP	Standard/System Operating Procedure
SOP	System Operations Panel

SOPC	Shuttle Operations and Planning Center
SOR	stable orbit endezvous
SOT	systems operation testing
SOT	Structural Operations Technology
SOW	Statement of Work
Soyuz	Russian vehicle used to transport personnel to and from Mir
SPA	Small Payload Attachment
SPACEHAB	One of the ISS modules
SPARC	Standard Planning & Requirement Committee
SPARS	Safety/Product Assurance Requirements Specification
SPAS	Space Pallet Satellite
SPASCOM	Space Station cost model
SPB	Strategic Planning Board
SPC	secondary power controller
SPC	Service and Performance Checkout
SPC	Shuttle Processing Contractor
SPC	Supplier Product Control
SPCE	servicing performance and checkout equipment
SPCS	Service and Performance Checkout System
SPCU	service and performance checkout unit
SPD	serial parallel digital

SPDA	secondary power distribution assembly
SPDD	Software Preliminary Design Document
SPDM	special purpose dexterous manipulator
SPDMS	Shuttle Program Data Management System
SPDR	Software/Subcontractor Preliminary Design Review
SPDS	Secondary Power Distribution System
SPDS	shuttle/stabilized payload deployment system
SPE	Solar Particle Event
SPEE	special purpose end effector
Spektr	One of the modules of the Mir Orbiting Station
SPEL	Space Power Electronics Lab
SPEX	space plasma experiment
SPF	single-point failure
SPF	Software Production Facility
SPF	Space Power Facility
SPF	Spacelab Processing Facility
SPF	specific pathogen free
SPI	Schedule Performance Index
SPIA	Small Payload Interface Adapter
SPIAP	shuttle payload integration activities plan
SPIP	Station Program Implementation Plan

SPL	solar pumped laser
SPL	sound pressure level
SPM	solar power module
SPMP	Station Procedures Management Plan
SPOC	Shuttle Payload of Opportunity Carrier
SPOC	single point orbit calculator
SPOT	Space Station Proximity Operations Trainer
SPP	solar pumped plasma
SPP	Science Power Platform
SPP&A	Strategic Project Planning and Assessment
SPPF	Site Platform Processing Facility
SPPF	Spacehab Payload Processing Facility
SPR	Software Problem Report
SPR	Strategic Planning Review
SPS	Software Product Specification
SPT	solar panel technology
SPTB	secondary power test bed
SQA	Software Quality Assurance
SQL	structural query language
SQUID	Standard Quick Release Universal Interface Device
SR	safety and reliability

SR	service request
SR	status report
SR	Status Review
SR	System Requirement
SR&QA	Safety, Reliability, and Quality Assurance
SRAM	Static Random Access Memory
SRB	Software Review Board
SRB	Solid Rocket Booster
SRC	Specimen Research Centrifuge
SRD	System Requirements Document
SRDCS	Simulation Reconfiguration Data Collection Subsystem
SRM	Safety, Reliability, and Maintainability
SRM	Solid Rocket Motor
SRM&QA	Safety, Reliability, Maintainability and Quality Assurance
SRMS	Shuttle Remote Manipulator System
SRP	Safety Review Panel
SRP	standard repair procedure
SRR	Software Requirements Review
SRR	System Requirements Review
SRS	software requirements specification
SRS	supplemental reboost system

SRT	Station Redesign Team
SRU	shop replaceable unit
SS	space segment
SS	Space Station/Shuttle
SS	sun sensor
SS	System Specification
SSA	S-Band Single Access
SSA	Space Structure Assembly
SSA	Space Suit Assembly
SSAD	Structured Systems Analysis & Design
SSAF	S-Band, Single Access Forward
SSAIAF	Space Station Automated Integration and Assembly Facility
SSAIT	Space Station Analysis and Integration Team
SSAR	S-Band, Single Access Return
SSAR	Stereo Synthetic Aperture Radar
SSAS	segment-to-segment attach system
SSAS	solid sorbent air sampler
SSAT	Space Station assembly technology
SSATA	Space Station airlock test article
SSB	Source Selection Board
SSBRP	Space Station Biological Research Project

SSC	Space Station Complex
SSCB	Space Station Control Board
SSCBD	Space Station Control Board Directive
SSCC	Space Station Control Center
SSCE	Space Station core equipment
SSCM	Space Station Change Memo
SSCN	Space Station Change Notice
SSCP	small self-contained payload
SSCR	Space Station change request
SSCS	Space to Space Communications System
SSCTS	Space Station Communications and Tracking System
SSD	Space Station Division
SSD.	Sun-Synchronous Day/Night
SSDMS	Space Station Data Management System
SSDS	Space Station Data System
SSDS/AA	Space Station Data System/Analysis Architecture
SSE	software support environment
SSE	Solar System Exploration
SSE	Space Station element
SSE	space support equipment
SSE	sun sensor electronics

SSEIC	Space Station Engineering Integration Contractor
SSEMU	Space Station Extravehicular Mobility Unit
SSETS	Space Station Element Transportation System
SSF	S-Band Shuttle forward
SSFF	Space Station Furnace Facility
SSG	Servicing Scenario Generator
SSH	S-Band Shuttle
SSHA	space system hazard analysis
SSHC	Space Station hand controller
SSHPF	Space Station Hazardous Processing Facility
SSICB	Space Station Integration Control Board
SSIF	Space Station Integration Facility
SSIPC	Space Station Integrated Promotion Center (NASDA)
SSIR	Space Station Integration Review
SSIS	Space Station Information System
SSL	system specification language
SSM	Spacecraft Systems Monitor
SSM	Subsystem Manager
SSM	Subsystem/Systems Support Module
SSM	Support System Module
SSMB	Space Station Manned Base

SSMDM	Space Station Multiplexer/Demultiplexer
SSME	Space Shuttle Main Engine
SSMES	Systems Support Module Equipment Section
SSMI	Special Sensor Microwave Imager
SSMTF	Space Station Man-Systems Training Facility
SSMTF	Space Station Mockup and Test/Training Facility
SSMVP	Space Station Master Verification Plan
SSMVPR	Space Station Master Verification Process Requirements
SSMVR	Space Station Master Verification Requirements
SSO	Source Selection Official
SSOC	Space Station Operations Center
SSODB	Space Station Operations Data Book
SSOL	Space Station Operation Language
SSP	Space Station Program
SSP	Space Shuttle Program
SSPAO	Space Station Safety Product Assurance Office
SSPF	Space Station Processing Facility
SSPIF	Software Support Production Integration Facility
SSPM	Schedule Statusing and Performance Measurement
SSPM	Software Standards and Procedures Manual
SSPM	Space Station Pricing Model

SSPO	Space Station Program Office
SSPP	Space Station program participant
SSQ	Space Station Quality
SSR	S-Band Shuttle Return
SSR	Software Specification Review
SSRB	Senior Safety Review Board
SSRFAR	Space Station Research Facility Assessment Review
SSRMS	Space Station Remote Manipulator System
SSRPOS	Space Station Rendezvous and Proximity Operations Simulator
SSS	solid state switch
SSS	space-to-space subsystem
SSSA	Space Station Solar Array
SSSAA	Space Station Solar Array Assemblies
SSSAS	Space Station Systems Analysis Study
SSSC	Space Station Support Center/Complex
SSSF	Space Station Support Facility
SSSM	System Support Service Module
SSSP	Space Station Safety Program
SSSR	Space To Space Station Radio
SSST	Space Station Systems Trainer
SST	Satellite Servicing Technology

SST	Spacecraft Systems Test
SST	Supersonic Transport
SSTC	Space Station Training Center
SSTF	Space Station Training Facility
SSTMF	Space Station Training and Mockup Facility
SSTP	System Supporting Test Plan
SSU	Sequential Shunt Unit
SSUAS	Space Station Utilization Advisory Subcommittee
SSUB	Space Station Utilization Board
SSUIS	Space Station User Information System
SSUWG	Space Station Users Working Group
SSVTF	Space Station Verification and Training Facility
ST	special tooling
STA	service track assembly
STA	Science and Technology Agency (Japan)
STA	Star Tracker assembly
STA	structural test article
STAR	Scientific and Technical Report
STARS	Space Transportation Accounting and Resources System (KSC)
STD	software test description
STD	standard

STDN	Space Tracking and Data Network
STE	special test equipment
STel	Standard Telecommunications
STF	Simulation and Training Function
STI	Scientific and Technical Information
STO	Solar Terrestrial Observatory
STP	short term plan
STP	Space Test Program
STP	standard temperature and pressure
STR	Starboard Thermal Radiator
STRAP	Station Reboost Analysis Program
STS	Space Transportation System
STU	science, technology, and utilization
STV	Space Transfer Vehicle
SUL	software usage list
SUM	science utilization management
SUP	supply
SURR	Stage Unique Requirements Report
SURS	Standard Umbilical Retractor System
SUSIM	Solar Ultraviolet Spectral Irradiance Monitor
SV	schedule variance

SV	space vehicle
Sv	Sievert (radiation dose unit of measure)
SVF	Software Verification Facility
SW	software
SWCB	Software Control Board
SWG	Safety/Science/Simulation Working Group
SWHA	software hazard analysis
SWI	sterile water for injection
SWQA	Software Quality Assurance
T	temperature
T&A	test and adjust
T&C	telemetry and command
T&DA	tracking and data acquisition
T&E	test and evaluation
T&H	transportation and handling
T&V	test and verification
T&VCB	Test and Verification Control Board
T/L	termination liability
T/M	telemetry
T/R	transmitter-receiver
TA	task agreement

TA	Teleoperator Assembler
TA	test article
TA&A	translation aids and attachments
TACAN	Tactical Air Navigation
TAG	Technology Advocacy Group
TAL	transatlantic abort landing
TAM	Technology Area Manager
TAT	turnaround time
TAV	Transatmospheric Vehicle
TAVERNS	Test and Verification Environment for Remotely Networked Systems
TBD	to be determined
TBR	to be resolved/revised
TBS	to be specified/supplied
TBT	total body temperature
TBU	Telemetry Buffer Unit
TC	thermal Control
TCCS	Trace Contaminant Control System
TCE	thermal conditioning electronics
TCFT	TUS copper-fiber transceiver
TCIP	Technical and Configuration Integration Panel
TCMS	Test Control and Monitoring System

TCP	Transmission/Transport Control Protocol
TCR	Technical Cost Review
TCS	Technical Change Summary
TCS	Thermal Control System
TCS	trajectory control sensor
TCSS	Thermal Conditions Support System
TD	technical direction/directive
TD&D	Technical Data and Documentation
TD/CD	Technical Direction/Contract Direction
TDAS	Test Data Analysis System
TDASS	Tracking and Data Acquisition Satellite System
TDB	time distribution bus
TDC	transition document change
TDD	Test Documentation Drawing
TDL	Transparent Datalink
TDM	Technology Development Mission
TDM	time division multiplexed
TDR	time domain reflectometer
TDR	tracking data relay
TDRS	Tracking and Data Relay Satellite
TDRSS	Tracking and Data Relay Satellite System

TDS	Test Description Sheet
TDY	temporary duty
TE	technical evaluation
TE	test enclosure
TE	thermoelectric
TE/WAX/RAD	thermoelectric/wax/radiator
TEA	torque equilibrium attitude
TEAMS	Technology Experiments Advancing Missions in Space
TEEM	Two-Phase Extended Evaluation in Microgravity
TEF	thermal electric freezer
TEHOF	Thermal Electric Holding Facility
TEMP	temperature/temporary
TEMP	thermal energy management process
TEP	Team Execution Plan
TEPC	Tissue Equivalent Proportional Counter
TEPS	Telerobotic Electrical Power Subsystem
TES	test execution software
TEU	thermoelectric unit
TeV	tera-electron volts
TFDU	thin-film disposition unit
TFU	theoretical first unit

TGS	Time Generation System
TGU	time generation unit
THA	Total Hydrocarbon Analyzer
THC	temperature and humidity control
THEME	Terrestrial Hardware Engineered for the Microgravity Environment
TI	transition initialization
TID	Traveling Ionospheric Disturbance
TIG	time of ignition
TIM	technical interchange meeting
TIMS	Thermal Infrared Mapping Spectrometer
TIP	Technical Integration Panel
TIP	thrust inlet pressure
TIPS	Technical Information Processing System
TL	termination liability
TL	thermoluminescent
TLCSC	top level computer software component
TLF	test logic flow
TLM	telemetry
TLP	transmission level point
TLV	threshold limit value
TM	task/technical manager

TM	technical manual
TMA	Technical Management Area
TMDE	Test. Measurement and Diagnostic Equipment
TMG	thermal model generator
TMIS	Technical and Management Information System
TML	total mass loss
TMM	Thermal Math Model
TMMCH/Y	total mean maintenance crew hours per year
TMS	task/technical/test management system
TMS	teleoperator maneuvering system
TMS	test measurement system
TMS	thermal maneuvering system
TN	TDRSS Network
TO	task order
TO	technical officer
TOC	Test Operation Center
TOC	total organic carbon
TOL	Telemetry Object List
TOMRS	Test, Operations and Maintenance Requirements and Specifications
TOMS	Task Order Management System
TOP	Tactical Operations Plan

TOPCAT	total program cost analysis tool
TOS	Transfer Orbit Stage
TP	teleprocessing
TPA	Test Planning Analysis
TPC	technical performance criteria
TPC	Telemetry Preprocessing Computers
TPEP	Transition Program Execution Plan
TPF	Terminal Phase Final
TPI	Terminal Phase Initiation
TPITS	Two-Phase Integrated Thermal System
TPM	Technical Performance Measurement
TPM	Technical Program Measurement
TPM	terminal phase midcourse
TPP	top program problem
TPR	Team of Primary Responsibility
TPR	Terminal Phase Rendezvous
TPS	Technical Planning Sheet
TPS	test preparation sheet
TPS	Thermal Protection System
TQI	Total Quality Involvement
TQM	Total Quality Management

TR	test report
TRASYS	Thermal Radiation Analyzer System
TRB	test review board
TRC	transmitter-receiver-controller
TRD	test requirements document
TREP	Tropical Rainfall Experiment Package
TRIC	Transition Radiation and Ionization Calorimeter
TRMM	Thermal Radiation Math Model
TRR	Technical Requirements Review
TRR	Test Readiness Review
TRR	Thermal Radiator Rotation
TRRB	Test Readiness Review Board
TRRJ	thermal radiator rotary joint
TSA	test start approval
TSC	thermal shape control
TSC	tradeoff study control
TSCV	test setup, configuration, and verification
TSO	Time-Sharing Option
TSP	Twisted Shielded Pair
TSR	Technical Status/Support Review
TSS	Tethered Satellite System

TSS	tradeoff study suggestion
TsUP	Russian Mission Control Center in Kaliningrad
TT&C	Telemetry, Tracking and Communications
TTA	technical task agreement
TTB	thermal test bed
TTC	Telemetry Traffic Control
TTCP	Technology Transfer Control Plan
TTI	Tech Trans International
TTL	transistor-to-transistor logic
TTN	Threshold Task Number
TTRT	target token rotation time
TTS	temporary threshold shift (hearing)
TTS2	temporary threshold shift measured 2 minutes after exposure
TTY	teletype
TURF	transport utilization requirements faction
TUS	trailing umbilical system
TV	television
TVCIC	television camera interface controller
TVS	thermal vacuum stability
TVT	thermal vacuum testing
U&O	utilization and operations

U/S	user/station
UBA	unpressurized berthing adapter
UBIC	Universal Bus Interface Controller
UBM	unpressurized berthing mast/mechanism
UCD	urine collection device
UCP	Utilization Control Panel
UCTR	UHF communication transmitter-receiver
UDFR	user defined functional requirements
UDM	Universal Docking Module
UDM	unpressurized docking mast
UDMH	unsymmetrical dimethyldrazine
UDS	utility distribution system
UE	user equipment
UF	utility/utilization flight
UHF	ultrahigh frequency
UI	user integration/interface
UIC	User Identification Code
UIDB	user interface data base
UIE	User Interface Environment
UIL	User/Utility Interface Language
UIS	User Interface System

ULBC	universal local bus controller
ULC	unpressurized logistics carrier
ULCAS	unpressurized logistics carrier attach system
ULE	unpressulized logistics element
ULT	ultimate (loads)
UMA	umbilical mechanism assembly
UMDB	User Mission Data Base
UNSR	Unclassified National Security Related
UOC	Usable On Codes
UOF	User Operations Facility
UOF	utilization outfitting
UOIF	User Operations Interface Function
UOP	utility outlet port
UOP	Utilization Operations Panel
UOS	User Operations Support
UOTAT	Utilization, Operations, and Training Assessment Team
UPDM	unpressuIized docking mast
UPN	Unique Project Number
UPR	Unit Performance Record
UPS	uninterrupted power supply
URD	User Requirements Document

URE	user range error
URL	Uniform Resource Locator
U.S.	United States
US	upper stage
US	user segment
USA	United States of America
USAF	United States Air Force
USE	User Support Environment
USENET	User Network
USGS	United States Ground Segment
USGS	U.S. Geological Survey
USL	U.S. Laboratory
USOC	U.S. Science Operations Center
USOS	U.S. on-orbit segment
USS	user services support
UT	universal time
UTA	utility transfer assembly
UTC	Universal Time Coordinated
UTDF	Universal Tracking Data Format
UTF	Utilization Training Facility
UTS	ultimate tensile strength

UVR	ultraviolet radiation
UWTF	Underwater Test Facility
V	volts
V&V	verification and validation
V-BAR	Orbit Velocity-Vector
VA	vehicle analysis
VAB	Vehicle Assembly Building
VAC	volts (Alternating Current)
VAC	Variance at Completion
VAFB	Vandenberg Air Force Base
VAIT	Vehicle Analysis and Integration Team
VAMS	Vibroacoustic Monitoring System
VAPEPS	vibroacoustic payload environment prediction system
VAS	Validation System
VAT	Value Added Tax
VATA	Vertical Assembly and Test Area
VATF	Vertical Assembly Test Facility
VAX	Virtual Address Extension
VBSP	video baseband signal processor
VC	virtual channel
VC	voice circuit

VCA	virtual channel access
VCB	Vehicle Control Board
VCD	vapor-compression distillation
VCDU	Virtual Channel Data Unit
VCG	vapor crystal growth
VCM	volatile condensable material
VCN	Verification Completion Notice
VCR	Video Cassette Recorder
VCRC	Voice Circuit Reconfiguration Confirmation
VCRR	Voice Circuit Reconfiguration Request
VCS	Video Compression System
VDB	Verification Data Base
VDC	volts (direct current)
VDPU	Video and Data Processing Unit
VDS	Vehicle Dynamics Simulator
VDS	video distribution subsystem
VDT	Visual Display Terminal
VER	Variance Exception Report
VER	verification
VES	Vehicle Effectiveness and Safety
VF	verification fixture

Vg	vacuum gage
VHF	very high frequency
VHOL	Very High Order Language
VHS	Video Home System
VHSIC	Very-High-Speed Integrated Circuit
VI	vehicle integration
Vi	internal velocity
VIC	Vehicle Identification Code
VIC	video interface controller
VIP	Verification Integration Plan
VIPT	Vehicle Integrated Product Team
VIR	Verification Implementation Requirement
VIR	Visible Infrared Radar
VIS	verification information system
VIS	vibration isolation system
VIS/UV	visual/ultraviolet
VITS	Video Teleconferencing System
VLA	verification loads analysis
VLBI	Very Long Baseline Interferometry
VLF	very low frequency
VLN	Verification Logic Network

VLSI	Very Large-Scale Integration
VLSIC	Very Large-Scale Integrated Circuit
VLSID	Very Large-Scale Integrated Device
VLV	valve
VM	virtual memory
VMDB	Vehicle Master Database
VMS	Velocity Measuring System
VMS	Virtual Memory System
VOA	volatile organic analyzer
VOC	volatile organic concentrator
VOIR	Venus Orbiting Imaging Radar
VPF	Vertical Processing Facility
VPPA	variable polarity plasma arc
VRA	volatile removal assembly
VRCS	Vector/Vernier Reaction Control System
Vrms	volts root-mean-square
VRTS	Verification Requirements Tracking System
VS	Vacuum System
VS	virtual storage
VS&A	vibrations, shock, and acoustics
VSW	video switch

VT	vehicle tests
VTAM	Virtual Telecommunications Access Method
VTAR	Verification Test/Analysis Reports
VTB	verification test bed
VTC	Vital Telemetry Telecommand Computer
VTR	video tape recorder
VTS	verification tracking system
VTS	Voice Teleconferencing System
VUV	vacuum ultraviolet
VV	visiting vehicle
VVIG	Visiting Vehicle Integration Group
W	watt
w/o	without
WAD	Work Authorization Document
WAN	Wide Area Network
WB	wideband
WBGT	wet bulb globe temperature
WBS	Work Breakdown Structure
WCS	Waste Control System
W/D	Wet/Dry Index
WETF	Weightless Environment Training Facility

WF	wide field
WFI	water for injection
WFPC	Wide Field Planetary Camera
WG	working group
WGA	waste gas assembly
WI	wave injector
WICAT	World Interactive Computer-Assisted Training
WIRRS	Waste Ice Release and Removal System
WISP	Waves in Space Plasma
WL	west longitude
WM	Waste Management
WM	Window Manager
WMC	Waste Management Compartment
WO	work order
WORM	write once read many/memory
WPE	weight, power, EVA
WR	weather radar
WRM	water recovery management
WS	Windsat
WS	workstation
WSTF	White Sands Test Facility

wt	weight
WTR	Western Test Range
X	perpendicular to orbit plane
XA	extended architecture
XCVR	transceiver
Xe	Xenon
XFER	transfer
XGP	Experimental Geosynchronous Platform
XPDR	transponder
XPOP	X axis pointing out of plane
XRS	X-Ray Spectrometer
XTE	X-Ray Timing Explorer
ZAR	Zero-g Antenna Range
ZOE	zone of exclusion
ZPS	zero-prebreathe spacesuit

Curator: Kim Dismukes | Responsible NASA Official: Amiko Kauderer | Updated: 03/27/2012 Privacy Policy and Important Notices