Taking a break during emergency egress training at Launch Pad 39B are (left to right) STS-103 Mission Specialists Jean-Frangois Clervoy of France, Claude Nicollier of Switzerland, Commander Curtis L. Brown Jr., Pilot Scott J. Kelly, and Mission Specialists John M. Grunsfeld (Ph.D.), C. Michael Foale (Ph.D.) and Steven L. Smith. Clervoy and Nicollier are with the European Space Agency. The training is part of Terminal Countdown Demonstration Test (TCDT) activities that also include opportunities to inspect the mission payloads in the orbiter's payload bay and simulated countdown exercises. STS-103 is a "call-up" mission due to the need to replace and repair portions of the Hubble Space Telescope, including the gyroscopes that allow the telescope to point at stars, galaxies and planets. The STS-103 crew will be replacing a Fine Guidance Sensor, an older computer with a new enhanced model, an older data tape recorder with a solid-state digital recorder, a failed spare transmitter with a new one, and degraded insulation on the telescope with new thermal insulation. The crew will also install a Battery Voltage/Temperature Improvement Kit to protect the spacecraft batteries from overcharging and overheating when the telescope goes into a safe mode. Four EVA's are planned to make the necessary repairs and replacements on the telescope. The mission is targeted for launch Dec. 6 at 2:37 a.m. EST. (Photo Release Date: 11/17/1999 )

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