page_title: Integrated Truss Structure
section_title: P6, S6 trusses
hierarchical_section_title: Integrated Truss Structure / Truss components / P6, S6 trusses
caption_attribution_description: Computer-generated artist’s rendering of the International Space Station after flight STS-119/15A. Fourth starboard truss segment (S6) is delivered and installed. Fourth set of solar arrays is deployed. (Credit: NASA)
context_page_description: The Integrated Truss Structure of the International Space Station consists of a linear arranged sequence of connected trusses on which various unpressurized components are mounted such as logistics carriers, radiators, solar arrays, and other equipment. It supplies the ISS with a bus architecture. It is approximately 110 meters long and is made from aluminum and stainless steel.
context_section_description: The P6 truss was the second truss segment to be added, because it contains a large Solar Array Wing (SAW) that generated essential electricity for the station, prior to activation of the SAW on the P4 truss. It was originally mounted to the Z1 truss and had its SAW extended during STS-97, but the SAW was folded, one half at a time, to make room for the SAWs on the P4 and S4 trusses, during STS-116 and STS-117 respectively.  Shuttle mission STS-120 (assembly mission 10A) detached the P6 truss from Z1, remounted it on the P5 truss, redeployed its radiator panels and attempted to redeploy its SAWs. One SAW (2B) was deployed successfully but the second SAW (4B) developed a significant tear that temporarily stopped deployment at around 80%. This was subsequently fixed and the array is now fully deployed. A later assembly mission (the out of sequence STS-119) mounted the S6 truss on the S5 truss, which provided a fourth and final set of solar arrays and radiators.
caption: S6 truss
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