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[b]Contingency spacewalk no earlier than April 22[/b] Preparations are underway for a contingency spacewalk by two of the International Space Station's Expedition 39 crew members no earlier than April 22 to replace a failed backup computer command relay box with a spare housed inside the station. Mission managers approved a plan for the preparation of two of the U.S. spacesuits on the station and the replacement of a fan pump separator on one of the suits prior to the spacewalk. That work will begin immediately. The station crew will also be readying the spare relay box for its staging in the Quest airlock prior to the spacewalk. The problem with the failed box, which measures 10.5 by 14.9 by 16.4 inches (26.7 by 37.8 by 41.7 cm) and weighs 50.8 pounds (23 kg), occurred during a routine health check of the device. The prime multiplexer demultiplexer (MDM) continues to operate normally. This pair of MDMs provide commanding to the station's external cooling system, Solar Alpha Rotary joints, Mobile Transporter rail car and insight into other truss systems.
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