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KENNEDY SPACE CENTER, Fla. - STS-112 Mission Specialist Sandra Magnus has her helmet adjusted during suit check, part of Terminal Countdown Demonstration Test activities. The TCDT also includes emergency egress training and a simulated launch countdown. The mission aboard Space Shuttle Atlantis is scheduled to launch no earlier than Oct. 2, between 2 and 6 p.m. EDT. STS-112 is the 15th assembly mission to the International Space Station. Atlantis will be carrying the S1 Integrated Truss Structure, the first starboard truss segment. The S1 will be attached to the central truss segment, S0, during the 11-day mission. Magnus will serve as one of two operators of the Canadarm2 robotic arm for S1 truss installation and during three scheduled spacewalks. STS-112 is her first Shuttle flight.