NASAのインスタグラム(nasa) - 12月22日 04時44分

Spacewalkers Remove Degraded Ammonia Pump - Expedition 38 Flight Engineers Rick Mastracchio and Mike Hopkins wrapped up a 5-hour, 28 minute spacewalk outside the International Space Station at 12:29 p.m. EST today, completing the first in a series of excursions aimed at replacing a degraded ammonia pump module associated with one of the station's two external cooling loops that keeps both internal and external equipment cool.
The two astronauts focused on removing a degraded pump module from Loop A of the station’s external Active Thermal Control System. That pump module encountered a problem Dec. 11 when an internal valve stuck in an incorrect position, causing temperatures in the station’s cooling lines to drop. On Monday, Mastracchio and Hopkins will venture outside the station again to begin the installation of a replacement pump module. If necessary a third spacewalk would occur on Christmas day to finalize the installation.
In this image, Mastracchio holds the degraded pump module while the space station's robotic arm guides the module to a grapple fixture.
Image Credit: NASA TV
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