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[b]Crew wraps up preparations for Wednesday spacewalk[/b]
Doug Wheelock and Tracy Caldwell Dyson spent Tuesday completing preparations for their spacewalk Wednesday to replace an ammonia coolant pump module that failed on July 31.
Ground controllers activated the gaseous pressure regulator valve for the Loop A nitrogen tank assembly, lowering the overall pressure for the inactive cooling loop. The reduced pressure will facilitate closing quick disconnect valves, enabling removal of the fourth and final fluid line connector holding the failed pump module in place.
The lowered pressure will also facilitate the remate of all of the fluid lines once the new pump is installed. That activity is targeted for the third spacewalk no earlier than Sunday.
Wheelock and Caldwell Dyson conducted final timeline reviews on Tuesday with flight controllers and moved into the Quest airlock just before 3 p.m. CDT to begin their overnight "campout" to reduce the nitrogen in their bloodstreams. They will be awakened at 1 a.m. on Wednesday to complete preparations and to don their spacesuits.
To complete some fine-tuning to robotic procedures and to allow the crew and the flight control team a little additional rest, the spacewalk Wednesday will begin one hour later than originally planned.
NASA Television coverage of the spacewalk will now begin at 6 a.m. CDT. The spacewalk is scheduled to begin just before 7 a.m.
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