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STS-92 Mission Specialist Leroy Chiao waves while waiting for suit check in the White Room. Behind him is Commander Brian Duffy. The White Room is an environmentally controlled area at the end of the Orbiter Access Arm that provides entry to the orbiter as well as emergency egress if needed. The arm remains in the extended position until 7 minutes 24 seconds before launch. Chiao, Duffy and the rest of the crew are undertaking the fifth flight to the International Space Station for construction. Discovery carries a payload that includes the Integrated Truss Structure Z-1, first of 10 trusses that will form the backbone of the Space Station, and the third Pressurized Mating Adapter that will provide a Shuttle docking port for solar array installation on the sixth Station flight and Lab installation on the seventh Station flight. The mission includes four spacewalks for the construction activities. Discovery’s landing is expected Oct. 22 at 2:10 p.m. EDT