STS-113 PAYLOADS
International Space Station Flight 11A

Payload Bay

P1 Truss

The primary payload for STS-113 is the P1 (P-One) Truss. It will be the fourth piece of the Integrated Truss Structure delivered to the station and will be attached to the port side of the S-0 (S-Zero) Truss.

The P1, which is primarily an aluminum structure, measures 13.7 meters (45 feet) long, 4.6 meters (15 feet wide) and 4 meters (13 feet) high and weighs 12,477 kilograms (27,506 pounds). With the addition of the P1, the Integrated Truss Structure will span 40.8 meters (134 feet). The P1 will also extend the station's Mobile Transporter rail line.

Like the S1, the P1 will provide structural support for the station's Active Thermal Control System with three radiators that contain eight panels each. The new truss has mounts for cameras and lights and contains a UHF antenna system. The P1 also has a port for an S-band antenna system, which is currently located on the P6 Truss and will be installed by spacewalkers on an upcoming mission.

Mounted to the P1 is the second Crew and Equipment Translation Aid, or CETA, cart. The first CETA cart arrived with the S1. The carts are manually operated by a spacewalker and can also be used as a work platform.

The P1 is scheduled to be attached to the station on Flight Day 4 by Canadarm2, the station's robot arm. STS-113 Mission Specialists Michael Lopez-Alegria and John Herrington will conduct three spacewalks to activate and out the P1.