Mission Specialists Yuri V. Lonchakov and John L. Phillips pause during slidewire basket training on the level of the Fixed Service Structure.

STS-100 Mission Specialists Yuri V. Lonchakov and John L. Phillips pause during slidewire basket training on the 195-foot level of the Fixed Service Structure. They and the rest of the crew are taking part in Terminal Countdown Demonstration Test activities, which also include payload walkdown and a simulated launch countdown. The primary payload on mission STS-100 comprises the Canadian robotic arm, SSRMS, and Multi-Purpose Logistics Module, Raffaello. Launch of Space Shuttle Endeavour on mission STS-100 is targeted for April 19 at 2:41 p.m. EDT from Launch Pad 39A