Expedition 24 Flight Engineers Doug Wheelock and Tracy Caldwell Dyson installed a spare ammonia pump in the International Space Station's starboard truss to replace a similar unit that had failed two weeks ago. The seven-hour, 20-minute EVA conducted on Aug. 16 was the final of three excursions needed to bring the station's cooling system back to full capability. The cooling loop, one of two aboard the ISS, is expected to be reactivated this Thursday, Aug. 19.
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