Spacewalkers Scott Kelly and Kjell Lindgren spent nearly eight hours outside the International Space Station.
Two NASA astronauts performed a long, complex maintenance job on Friday. They spent nearly eight hours outside the International Space Station and switched the ammonia coolant back to its normal levels.
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Astronaut Scott Kelly and Kjell Lindgren took exactly 7 hours and 48 minutes to restore the port truss (P6) Ammonia Cooling System to its original configuration, the main task of the Friday’s spacewalk. Though, they ran out of time to cinch backup radiator. The radiator was folded up against the station’s power truss and was in a dormant state. They decided to leave it extended.
The ammonia leakage was first detected three years ago and was eventually replaced with an ammonia pump. The first leak repair work was done by spacewalkers Suni Williams and Aki Hoshide in November 2012. More plumbing work was done to the system during a May 2013 spacewalk by NASA astronauts Chris Cassidy and Tom Marshburn.
Kelly/Lindgren’s eight-hour long spacewalk was the second for both astronauts in nine days. Last week, they carried out routine repair work outside the ISS. This time around, they had to install ammonia jumpers between truss segments. The whole system which is called Photovoltaic Thermal Control System threw away heat generated at the space station from radiators attached to the truss structure.
The task was potentially hazardous due to the involvement of ammonia, a substance dangerous to humans and spacewalkers in the past have encountered problems dealing with it. But Kelly and Lindgren faced no trouble. Kelly reported glove damage but it turned out to be a minor one.
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This also marks the 190th spacewalk outside the station. Now, crew members have spent a total of 1,192 hours and 4 minutes maintaining and working outside the orbital laboratory.