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Fourth STS-127 Spacewalk Complete

Published by Klaus Schmidt on Sat Jul 25, 2009 8:23 am via: source
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(NASA) – Mission specialists Chris Cassidy and Tom Marshburn finished replacing batteries on the International Space Station’s oldest solar arrays during a seven-hour, 12-minute spacewalk – the fourth of five planned during space shuttle Endeavour’s STS-127 mission.

They installed four of six new batteries for the P6 Truss structure, where a pair of solar array wings collects sunlight for power generation.

Tom Marshburn is seen through Chris Cassidy’s helmet camera as the two work outside the International Space Station during the fourth spacewalk of the STS-127 mission. Photo credit: NASA TV

Tom Marshburn is seen through Chris Cassidy’s helmet camera as the two work outside the International Space Station during the fourth spacewalk of the STS-127 mission. Photo credit: NASA TV

They stored four more of the old batteries onto a cargo carrier for return to Earth.

That completed the work with all 12 new and old batteries, which was begun on the mission’s third spacewalk by Cassidy and Mission Specialist Dave Wolf.

Higher than expected carbon dioxide levels in Cassidy’s suit limited that spacewalk’s duration, so the remaining battery tasks were deferred until today.

Inside the complex, Tim Kopra choreographed the activities. Mission specialists Koichi Wakata and Julie Payette used Canadarm2 – the station’s robotic arm – to hand the Integrated Cargo Carrier with the old batteries to the shuttle’s arm.

Pilot Doug Hurley and Commander Mark Polansky then secured the carrier in Endeavour’s cargo bay at 5:52 p.m. for return home.

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