After replacing the pump, NASA chose to undo jury-rigged repairs made to the leaking cooling system and restore the radiator system to its original setup. Spacewalkers rerouted the ammonia in 2012 to isolate the leak, but traced the leak to another component in 2013.
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Friday’s trip was planned primarily for working on the cooling system of the space station. It even involved the return of ammonia levels to their desired intensity in the prime as well as the backup systems. This was the second spacewalk for Kelly and Lindgren in less than a fortnight.
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Early in the outing, the spacewalkers reported seeing flakes of ammonia when disconnecting a few of the equipment, but the crew was not in any danger, said NASA commentator Rob Navias. Japanese astronaut Kimiya Yui and Russian cosmonaut Sergey Volkov helped them out of their suits once the astronauts repressurized.
Minutes after the ammonia leak, Kelly, NASA’s yearlong spaceman, reported that the forefinger of his right glove had a stitch poking out. In a final task, Kelly will reconfigure a cart attached to the mobile base system that allows the station’s robot arm to move from one worksite to another.
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When making connections of a cooling line, Kjell Lindgren, a NASA astronaut, encountered flashing flakes of toxic ammonia and informed the Mission Control about the incident. One additional part of the mission, cinching the backup radiator in place along the side of the station and adding a protective cover, was not able to be completed. Melvin has degrees in chemistry and materials science engineering, but before he was recruited by NASA, he was drafted by the Detroit Lions to play professional football.
