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Space Station Crew Set For Spacewalk

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Crew Set to Conduct Spacewalk and Release Cargo Ship

Expedition 39 is finalizing preparations for a 2.5 hour spacewalk scheduled to begin 9:20 a.m. EDT Wednesday. The station crew is also getting ready to send off a Russian space freighter for two days of tests before it redocks again Friday morning.

Spacewalkers Steve Swanson and Rick Mastracchio will install a spare backup computer on the S0 truss located on top of the Destiny laboratory module Wednesday morning. They will remove the old computer which failed April 11 after being shut down then restarted for a periodic health check.

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Astronauts Exit Station after Progress Undocks for Tests

NASA Astronauts Steve Swanson and Rick Mastracchio have stepped outside the International Space Station for a short spacewalk to replace a failed Multiplexer/Demultiplexer (MDM) back up computer. They set their spacesuits to battery power at 9:56 a.m. EDT signifying the excursion’s official beginning time.

The backup computer failed April 11 after a routine health check by the Mission Control team in Houston. While the primary computer continues operating flawlessly NASA managers ordered today’s spacewalk repair to ensure redundancy on critical systems. The computer outage did not pose a risk to the six crew members aboard the space station.

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Astronauts Complete Short Spacewalk to Replace Backup Computer

NASA Astronauts Steve Swanson and Rick Mastracchio have completed a short spacewalk to replace a failed Multiplexer/Demultiplexer (MDM) back up computer. They began the re-pressurization of the Quest airlock at 11:32 a.m. EDT signifying the excursion’s end time.

The backup computer failed April 11 after a routine health check by the Mission Control team in Houston. While the primary computer continues operating flawlessly NASA managers ordered today’s spacewalk repair to ensure redundancy on critical systems. The computer outage did not pose a risk to the six crew members aboard the space station.

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Astronauts Replace Backup Computer During Spacewalk

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.

Credit: NASA

Source: NASA - Multimedia

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Crew Relaxes After Spacewalk, More Cargo Ops and Redocking Preps

Expedition 39 is relaxing the day after a short spacewalk to replace a backup computer. The crew members are also preparing to welcome back a Russian resupply freighter that undocked a couple of days ago.

NASA astronauts Rick Mastracchio and Steve Swanson successfully replaced a backup multiplexer/demultiplexer computer Wednesday morning during a spacewalk that lasted just one hour and 36 minutes. Ground controllers then powered up the device, ran diagnostics and updated software on the external computer restoring redundancy to the station’s truss system.

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