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The payload bay doors of Space Shuttle Atlantis close on the primary payloads for mission STS-112. The Shuttle is carrying the S1 Integrated Truss Structure, the first starboard truss segment, to be attached to the central truss segment, S0, plus the Crew and Equipment Translation Aid (CETA) Cart A. The CETA is the first of two human-powered carts that will ride along the ISS railway, providing mobile work platforms for future spacewalking astronauts. Launch of Atlantis is scheduled for Oct. 2 with a crew of six. The 11-day mission includes three spacewalks.