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ITS-S1 and ITS-P1 (Integrated Truss Structure) are elements of the International Space Stations main truss structure.

The Integrated Truss Structure of the ISS consists of a linearly arranged sequence of connected trusses which is used to mount various unpressurized components, such as ELC logistics carriers, radiators, solar arrays, and other equipment.

The P1 and S1 truss segments are mounted port and starbord on the central ITS-S0 segment. These truss segments each mount three articulated heat rejection radiators, which each uses 290 kg of anhydrous ammonia. They also contain carts to transport the Canadarm2 and astronauts to worksites along the space station. Design, test and construction of the S1 and P1 structures was conducted by McDonnell Douglas (now Boeing) in Huntington Beach, CA.

The S1 truss was launched on STS-112 in October 2002 and the P1 truss was launched on STS-113 in November 2002.

Nation: USA
Type / Application: Space Station truss structure
Operator: NASA
Contractors: Boeing
Propulsion: None
Power: via ISS
Mass: 12477 kg (#P1); 12572 kg (#S1)
Orbit: 400 km × 400 km, 51.6 (typical)
Satellite COSPAR Date LS Launch Vehicle Remarks
ITS-P1 N/A 24.11.2002 CCK LC-39A Shuttle with Endeavour F19 (STS 113), MEPSI 1A, MEPSI 1B
ITS-S1 N/A 07.10.2002 CCK LC-39B Shuttle with Atlantis F26 (STS 112)

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