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Discovery team wrap first ISS spacewalk

STS-131 mission running smoothly

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Mission specialists Clayton Anderson and Rick Mastracchio (seen below) earlier today ventured outside the International Space Station on the first of three planned spacewalks for space shuttle Discovery's STS-131 mission.

Rick Mastracchio exits the Quest airlock today. Pic: NASA TVThe pair exited the Quest airlock at 05:31 GMT, and during the six-hour, 27-minute EVA "disconnected ammonia and nitrogen fluid lines from a spent Ammonia Tank Assembly (ATA)".

They'll fit a replacement ATA on their second spacewalk, and today unbolted the tank from Discovery's cargo bay, allowing pilot James P Dutton Jr and mission specialist Stephanie Wilson to move it temporarily to the Quest Airlock External Stowage Platform 2 using the ISS's robotic arm.

Anderson and Mastracchio also "retrieved the Micro-Particles Capture/Space Environment Exposure Device experiment from the Japanese Exposed Facility", and "on the center-most portion of the International Space Station’s backbone, they replaced a Rate Gyro Assembly, part of the station’s navigation system".

Anderson and Mastracchio are old hands at extravehicular activity, and "performed two spacewalks together during the STS-118 mission in August 2007", NASA notes. On that occasion, they were tasked with adding "the third starboard truss segment, the S5 truss, to the station's backbone". ®

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