Shuttle
Reference Manual
Space Shuttle
Orbiter Systems
Orbital Maneuvering Systems
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Overview
Provides
thrust for orbit insertion, orbit circularization, orbit transfer,
rendezvous and deorbit.
Helium
Pressurization
Each pod pressurazation systems consists of a helium tank, valves
and regulators.
Propellant
Storage and Distribution
Consists of one fuel tank and one oxidizer tank in each pod.
Engine
Bipropellant Valve Assembly
Each OMS engine receives
pressure-fed propellants at its bipropellant valve assembly.
Engine
Thrust Chamber Assembly
The thrust chamber is where the fuel and oxydizer react in the injector.
OMS
Thrusting Sequence
The OMS thrusting sequence commands the OMS engines on or off and
commands the engine purge function.
Engine
Thrust Vector Control System
The engine TVC system consists of a gimbal ring assembly, two gimbal
actuator assemblies, and two gimbal actuator controllers.
Thermal
Control
OMS thermal control is achieved by insulation in the OMS pods and
strip heaters.
OMS-RCS
Interconnect
OMS propellant can be used to operate the Reaction Control System.
OMS-to-RCS
Gauging Sequence
The OMS-to-aft-RCS propellant quantities are calculated by burn
time integration.
Abort
Control Sequences
The abort control sequence software manages OMS and RCS configuration
and thrusting periods during ascent aborts.
OMS
Engine Fault Detection and Identification
The OMS engine FDI function detects and identifies off-nominal performance
of the OMS engine.
OMS
Gimbal Actuator FDI
THe OMS gimbal actuator FDI detects and identifies off-nominal performance
of the pitch and yaw gimbal actuators of the OMS engines.
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