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STS90-E-5171
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STS90-E-5171

June 7, 2011
This Electronic Still Camera (ESC) image shows astronaut Richard A. Searfoss, commander, performing in-flight maintenance (IFM). The Regenerative Carbon Dioxide Removal System (RCRS) shutdown April 24, 1998, setting off an alarm and delaying the crew's sleep period several hours. Searfoss removed a hose clamp and used tape to bypass a check valve that had threatened to cut the flight short. The valve, part of the air-scrubbing systems plumbing that recirculates nitrogen back into the cabin atmosphere, was allowing cabin pressure to leak into the system throwing off its electronics control unit.