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[b]Astronauts on spacewalk wrap AMS repair[/b] Expedition 61 crewmates Drew Morgan and Luca Parmitano concluded their fourth spacewalk together on Saturday (Jan. 25) at 1:20 p.m. EST (1820 GMT). During the 6 hour, 16 minute spacewalk, the two astronauts successfully completed leak checks for the cooling system on the Alpha Magnetic Spectrometer (AMS) and opened a valve to begin pressurizing the system. Preliminary tests showed AMS was responding as expected. Ground teams will work over the next several days to fill the new AMS thermal control system with carbon dioxide, allow the system to stabilize and power on the pumps to verify and optimize their performance. The tracker, one of several detectors on AMS, should be collecting science data again before the end of the week. The upgraded cooling system is expected to support AMS through the lifetime of the International Space Station. Morgan and Parmitano also completed an additional task to remove degraded lens filters on two high-definition video cameras. This was the 227th spacewalk in support of space station assembly, maintenance and upgrades since 1998. For Morgan, it was the seventh spacewalk of his career, for a total of 45 hours and 48 minutes. It was the sixth for Parmitano, who now has a total of 33 hours and 9 minutes, more cumulative time than any other European. Spacewalkers have now spent a total of 59 days, 12 hours and 26 minutes working outside the space station. This was also the ninth spacewalk for the Expedition 61 crew, more than any other increment in the history of the orbiting laboratory.
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