STS-117 crew members receive instruction on emergency egress during Terminal Countdown Demonstration Test activities.

At the 195-foot level of the fixed service structure on Launch Pad 39A, STS-117 crew members receive instruction on emergency egress during Terminal Countdown Demonstration Test activities. From left are Commander Rick Sturckow, Mission Specialist Danny Olivas and Pilot Lee Archambault. They and other crew members are practicing the emergency egress procedure using the slidewire basket system to get off the pad. The TCDT also includes M-113 armored personnel carrier training, and a simulated launch countdown. The mission payload aboard Space Shuttle Atlantis is the S3/S4 integrated truss structure, along with a third set of solar arrays and batteries. The crew of six astronauts will install the truss to continue assembly of the International Space Station. Photo credit: NASA/Kim Shiflett