International Space Station managers and the international partners approved plans late Friday for a spacewalk Saturday by Expedition 35 crew members Chris Cassidy and Tom Marshburn out of the Quest airlock of the U.S. segment of the complex to inspect and possibly replace a pump controller box on the station's far port truss (P6) suspected of leaking ammonia coolant. Final approval to conduct the spacewalk came after a day-long review of procedures and the crew's preparations to support the excursion.
A leak of ammonia coolant from the area near or at the location of a Pump and Flow Control Sub-assembly was detected on Thursday, prompting engineers and flight controllers to begin plans to support the spacewalk. The device contains the mechanical systems that drive the cooling functions for the port truss.
source:nasa
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