Expedition 59 Flight Engineers Nick Hague and Christina Koch (both NASA astronauts) ventured outside the International Space Station to finish work to replace batteries on the outpost’s P4 Truss segment.
Called U.S. EVA-53, it was originally expected to be conducted in Fall 2018, however, the in-flight abort of Soyuz MS-10 with Aleksey Ovchinin and Hague forced the indefinite postponement of this spacewalk series. Hague and Ovchinin, along with Koch, launched to the ISS in Soyuz MS-12 on March 14.
Koch and Hague put on spacesuits and exited the outpost via the Quest airlock at about 11:42 UTC March 29, 2019.
Anne McClain was originally supposed to perform this spacewalk alongside Koch, but a spacesuit fit issue prompted a McClain and Hague, who was assigned to a spacewalk on April 8, to switch assignments.
The two were slated to finish the work started during U.S. EVA-52 to replace the aging nickel-hydrogen batteries on the 2A Power Channel over the course of about seven hours.
The lithium-ion batteries were brought to the ISS inside the unpressurized section of the Japanese-built Kounotori 7 cargo ship and were stored on the exterior of the outpost. The work is a continuation of a years-long process that began in 2017.
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