5:30 p.m. CST Sunday, Nov. 23, 2008
Mission Control Center, Houston, Texas
STS-126 MCC Status Report #19
Expedition 18 Commander Mike Fincke and Endeavour Mission Specialist Don Pettit have proven their knack for detailed maintenance work during previous stays at the International Space Station and have once again put their skills to use.

The Urine Processor Assembly (UPA) inside the Water Recovery System (WRS), which recycles condensate and urine onboard the station, has experienced several shutdowns during testing. Engineers believe motion of the centrifuge caused physical interference within the UPA, resulting in increased power draw and temperatures.

Fincke and Pettit removed grommets from the UPA and hard-mounted it into the WRS rack. The grommets were serving as isolators to dampen vibrations from the centrifuge, but might have been allowing too much motion and causing the interference. Mission Control has been monitoring the UPA’s operation and it has been running normally for two hours without prematurely shutting down.

Endeavour crew members enjoyed four hours of free time, Pettit choosing to join Fincke during that time to work on the UPA. Then transfer activities continued, with more than 76 percent of that work complete, as well as preparations for Monday’s spacewalk.

Bowen and Kimbrough are scheduled to leave the station’s Quest airlock at 12:45 p.m. Monday on the mission’s fourth spacewalk and continue work on the station’s Solar Alpha Rotary Joints (SARJ). They both will remove insulating covers on the port SARJ and Kimbrough will follow through with its lubrication. Bowen will finish tasks on the starboard SARJ to install the final trundle bearing assembly.

Bowen will install a multi-layer insulation blanket on the station's Kibo module that was removed during the first spacewalk. The cover is associated with the Exposed Facility Berthing Mechanism on Kibo, which has since been remotely tested from inside station, and the cover can be reinstalled. During that testing, however, one of the four latches did not close properly and Bowen will help complete the checkout procedure in person.

Other tasks include installing a television camera on the port truss and a Global Positioning System antenna on Kibo that will be used for Japanese cargo craft arrivals.

Endeavour’s crew is scheduled to go to bed at 11:55 p.m. today and be awakened at 7:55 a.m. Monday. The next shuttle status report will be issued after the crew awakens, or earlier if events warrant.

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