Mission Specialists Michael Lopez-Alegria and John Herrington are scheduled to begin STS-113's third and final spacewalk at 1:20 p.m. CST (1920 GMT) today. Their first task will be to install 33 spool positioning devices -- clamp-like devices that ensure that the quick disconnect fittings in the station's ammonia coolant lines release as designed -- onto various station locations. They will also connect Ammonia Tank Assembly lines and reconfigure a circuit breaker on the Main Bus Switching Unit. If time allows, Lopez-Alegria and Herrington also will reconfigure a pyrotechnic device designed to release the P1 (P-One) Truss radiator panels when they are deployed next year. STS-113 Pilot Paul Lockhart will coordinate spacewalk activities and Commander Jim Wetherbee will be at the controls of Space Shuttle Endeavour's robot arm. Expedition Six Commander Ken Bowersox and NASA ISS Science Officers Peggy Whitson and Don Pettit will spend time operating the station arm, Canadarm2. This will be the 49th spacewalk performed at the station and the 24th based out of the station. STS-113's first two excursions totaled 12 hours and 55 minutes. Today's spacewalk is slated to last 6.5 hours. Launch Date: Nov. 23, 2002, Launch Vehicle: Endeavor Commander: Jim Wetherbee, Pilot: Paul Lockhart, Mission Specialists: Michael Lopez-Alegria, John Herrington.
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