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| Image above: Expedition 24 Flight Engineers Doug Wheelock (left) and Tracy Caldwell Dyson work to remove a failed ammonia pump module on the International Space Station's S1 Truss. Credit: NASA TV |
Expedition 24 Flight Engineers Doug Wheelock and Tracy Caldwell Dyson have completed the first of two planned spacewalks to remove and replace an ammonia pump module that failed July 31. Their spacewalk ended at 3:22 p.m. EDT, lasting eight hours, three minutes, making it the longest International Space Station-based spacewalk in history and the sixth longest in human spaceflight history. [
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