April 23, 2014
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.
The duo is working on the S0 truss which is where the backup MDM is located. The truss is located above the Destiny laboratory module and forms the center of the station’s Integrated Truss Structure, or backbone. The MDM provides telemetry and commands to truss systems, solar alpha rotary joints and the Mobile Transporter rail car which rides along the truss structure.
Swanson and Mastracchio are installing a spare MDM that was housed inside the Destiny lab since April 2001 when it was delivered aboard space shuttle Endeavour. They will remove the failed MDM from the S0 truss where it has been located since the truss was delivered with the MDM already inside in April 2002. The station houses 45 MDMs, 24 internally and 21 externally.
Station and SpaceX managers decided the computer failure wouldn’t impact Sunday’s arrival of the Dragon commercial cargo craft on the SpaceX-3 mission. After an engineering review of the station’s systems it was determined the station had enough redundancy for SpaceX-3 to begin its mission when it launched Friday afternoon aboard a Falcon 9 rocket.
A few hours earlier today an ISS Progress 53 resupply ship undocked from the Zvezda service module. It will back up about 311 miles from the space station so Russian mission controllers can test its upgraded Kurs automated rendezvous system. The Progress will redock again Friday at 8:15 a.m. to the Zvezda service module after the Kurs tests are complete.