Mission Specialist Piers Sellers undergoes suit check part of Terminal Countdown Demonstration Test activities.

STS-112 Mission Specialist Piers Sellers undergoes 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. Sellers will be undertaking three spacewalks during the mission. In addition, he will be in charge of on-board computers and rendezvous tools during Atlantis' approach for docking and the undocking and flyaround. STS-112 is Sellers first Shuttle flight.