On August 11, 2010 American astronauts completed the second of three spacewalks to fix a failed cooling pump on the International Space Station (ISS).
During the spacewalk, which lasted 7 hours and 26 minutes, Expedition 24 Flight Engineers Tracy Caldwell Dyson and Douglas Wheelock removed the failed ammonia coolant pump module.
One of two cooling systems serving the ISS broke down late on July 31, and the crew had shut down several pieces of equipment, including two of the station's four gyroscopes, to cut the heat generated on board.
