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Astronauts Replace Backup Computer During Spacewalk

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Published on Apr 23, 2014

Outside the International Space Station, Expedition 39 Flight Engineers Rick Mastracchio and Steve Swanson of NASA conducted a spacewalk April 23 to replace a backup computer relay box on the station's S0 (s-zero) truss. The relay box, which failed April 11, is called a multiplexer-demultiplexer, and assists in providing insight and commanding for the station's truss systems and associated hardware.

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