(04/07/2000) -- As part of Terminal Countdown Demonstration (TCDT) activities, the STS-101 crew practices emergency egress from the orbiter at the 195-foot level of the Fixed Service Structure. Shown heading for the slidewire baskets are Pilot Scott J. 'Doc' Horowitz (left) and Commander James D. Halsell Jr. The TCDT also includes a simulated launch countdown and familiarization with the payload. 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 to the Space Station. STS-101 is scheduled to launch April 24 at 4:15 p.m. from Launch Pad 39A