Expedition 64 Spacewalkers Complete ISS Upgrades, Battery Tasks

Photograph Credit score: NASA

Expedition 64 spacewalkers Mike Hopkins and Victor Glover wrapped up a five-hour and 20-minute session of Extravehicular (EVA) earlier right now (Monday), throughout which they accomplished a four-year-plus campaign to exchange 48 getting older nickel-hydrogen batteries on the -in Truss Construction (ITS) of the Worldwide House Station (ISS) with 24 smaller, lighter and extra succesful lithium-ion models.

Video Credit score: NASA

The duo—with Hopkins on the fourth spacewalk of his profession and Glover on his second—additionally labored to improve exterior cameras on the U.S. Destiny lab, the decrease outboard location of the station’s S-1 truss section and the Japanese Experiment Module Distant Manipulator System (JEM-RMS) on the Uncovered Facility (EF) of Japan’s Kibo lab.

As outlined last week by AmericaSpace, right now’s EVA was spearheaded by the necessity to full the battery substitute duties. Back in January 2017, Expedition 50 astronauts Shane Kimbrough, Thomas Pesquet and Peggy Whitson accomplished two spacewalks to take away 12 nickel-hydrogen batteries from the starboard-side S-Four truss and substitute them with six new lithium-ion models.

With an STS-107 patch and extra crew-related in satisfaction of place aboard the Worldwide House Station (ISS), right now’s U.S. EVA-70 marked the primary time {that a} spacewalk had been performed on the anniversary of Columbia’s loss. Photograph Credit score: Soichi Noguchi/NASA/Twitter

Two years later, in March 2019, Expedition 59’s Anne McClain, Nick Hague and Christina Koch supported one other two EVAs to do likewise on the port-side P-Four truss. Nonetheless, a number of weeks thereafter, one of many new P-Four lithium-ion batteries blew a fuse and—by way of distant commanding from Mission Management—was robotically eliminated by the 57.7-foot-long (17.6-meter) Canadarm2 and briefly changed with two of the unique (however nonetheless useful) nickel-hydrogen batteries.

It was all the time supposed that, when a substitute lithium-ion battery arrived on the ISS, it might be put in to finish the P-Four . Within the meantime, between October 2019 and January of final yr, no fewer than 4 EVAs had been carried out—together with the first in history to incorporate an all-female spacewalking workforce—to tend to the far-outboard P-6 truss. And extra lately, simply final summer time, Expedition 63’s Chris Cassidy and Bob Behnken accomplished the battery work on the far-outboard S-6 truss by way of three extra EVAs.

Pictured throughout his 27 January tour with Victor Glover, Mike Hopkins has now accomplished over 25 EVA in 4 spacewalks. Photograph Credit score: NASA

Within the meantime, a substitute lithium-ion battery for the P-4 truss arrived aboard SpaceX’s CRS-19 Dragon cargo ship in December 2019, whereupon it was stowed on the outside of the station to await set up.

Following final week’s spacewalk, Hopkins and Glover spent some off-duty time on Thursday, earlier than heading into the weekend with EVA opinions, checks of their Extravehicular Mobility Items (EMUs) and configuration of instruments. They had been assisted on this work by Expedition 64 crewmates Kate Rubins and Soichi Noguchi, who aided the duo with their suit-up procedures inside the station’s Quest airlock this morning.

Pictured throughout final week’s EVA, Victor Glover has now logged over 12 hours of spacewalking time. Photograph Credit score: NASA

Regardless of a late begin, Hopkins and Glover transferred their EMUs onto inside battery at 7:56 a.m. EST to kick off U.S. EVA-70, the 70th spacewalk carried out out of Quest, in U.S.-built fits, and within the absence of the shuttle, since February 2002. Final week, the 2 nickel-hydrogen batteries on the P-Four truss had been discharged, after which they had been eliminated and the brand new lithium-ion unit put in by way of ground-commanded robotics. Working swiftly, by 8:30 a.m. EST Hopkins and Glover completed the battery process by putting in an adapter plate to finish the requisite circuit.

Their subsequent process was the removing of a now-unneeded “H-Fixture” dealing with support from P-4 to make way for the planned arrival of upgraded ISS Roll-Out Solar Arrays (iROSAs) later this year and into next year. A complete of six new iROSA models—supplied by ISS prime contractor Boeing, its subsidiary, Sylmar, Calif.-headquartered Spectrolab, and main provider Deployable House Programs (DSS) of Goleta, Calif.—will partially “shadow” and increase {the } energy yield of six of the house station’s eight legacy Photo voltaic Array Wings (SAWs).

The Worldwide House Station (ISS) at the moment possesses eight Photo voltaic Array Wings (SAWs), six of which will likely be partially coated by the brand new iROSA arrays. Photograph Credit score: NASA

One of many two energy channels on the P-Four truss will likely be thus modified, with an expectation that its iROSA {hardware} will likely be delivered on a SpaceX Dragon cargo ship subsequent yr.

By 9 a.m. EST, Capcom Bob Hines in Mission Management radioed Hopkins and Glover to advise them that their fast had put them firmly again on the timeline, after the later-than-anticipated begin of EVA-70. The 2 males set to work changing a failed exterior digicam on the decrease outboard location of the S-1 truss and putting in a brand new high-definition digicam onto an current digicam group on the U.S. Future lab.

Victor Glover, seen throughout final week’s EVA. Photograph Credit score: NASA

Subsequent, Hopkins transitioned out to the far-port aspect of the station to the Uncovered Facility (EF) of the Kibo lab to take away and substitute a failed Wrist Imaginative and prescient Gear Field on the Japanese Experiment Module-Distant Manipulator System (JEM-RMS). “Three-for-three on the cameras right now, so good work,” radioed Hines.

Their main aims for U.S. EVA-70 thus accomplished, Hopkins and Glover pressed on with a number of “get-ahead” duties, together with work with the Articulating Moveable Foot Restraint (APFR) and the substitute of a magnetic plate on the Quest airlock’s thermal cowl. The 2 males lastly returned inside Quest and their second spacewalk in lower than every week ended after 5 hours and 20 minutes. This offers Glover a cumulative complete of 12 hours and 16 minutes in his first two profession EVAs and Hopkins some 25 hours and 14 minutes in 4 spacewalks.  

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