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In the Payload Changeout Room on Launch Pad 39B, access stairs are rolled into place next to the Payload Ground Handling Mechanism, which is used to transfer the payloads into the orbiter. The payloads for Return to Flight mission STS-114 that are being transferred to Discoverys payload bay include a Control Moment Gyro, the Thermal Protection System Detailed Test Objective box, which is placed on the Lightweight Multi-Purpose Experiment Support Structure Carrier, External Stowage Platform 2 and Multi-Purpose Logistics Module Raffaello. Already installed in the payload bay are the airlock, the Canadarm 2, or Shuttle arm, and the Orbiter Boom Sensor System. The launch window for mission STS-114 extends from July 13 to July 31.