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KENNEDY SPACE CENTER, Fla. -- During emergency egress training at Launch pad 39A, STS-101 Mission Specialists James Voss, Yury Usachev of Russia, and Susan J. Helms test the slidewire basket that they would use if needed to exit quickly from the fixed service structure at the 195-foot level. The training is part of Terminal Countdown Demonstration Test (TCDT) activities that include a simulated launch countdown and familiarization with the payload. Others taking part in the TCDT are Commander James D. Halsell Jr., Pilot Scott J. "Doc" Horowitz, and Mission Specialists Mary Ellen Weber and Jeffrey N. Williams. 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