NASA’s International Space Station mission management team gave formal approval on Aug. 10 for two additional spacewalks by Expedition 24 flight engineers Doug Wheelock and Tracy Caldwell Dyson to replace a failed circulation pump on the Loop A cooling system. The two astronauts were thwarted during an Aug. 7 spacewalk in their efforts to remove the bulky 780-lb. pump by an ammonia coolant leak. Under the plan approved by mission managers, Wheelock and Caldwell Dyson will depart the ...

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