(04/06/2000) -- At the 195-foot level of the Fixed Service Structure on Launch Pad 39A, the STS-101 crew get instruction in emergency egress in a slidewire basket during a Terminal Countdown Demonstration Test (TCDT). From left are Mission Specialist Yury Usachev and Susan Helms; Commander James Halsell; Mission Specialists James Voss, Mary Ellen Weber standing behind Jeffrey Williams; and Pilot Scott Horowitz. During their mission to the International Space Station, the STS-101 crew will be delivering logistics and supplies, plus preparing the Station for the arrival of the Zvezda Service Module, expected to be launched by Russia in July 2000. Also, the crew will conduct one space walk to perform maintenance on the Space Station. This will be the third assembly flight for the Space Station. STS-101 is scheduled to launch April 24 at 4:15 p.m. from Launch Pad 39A