NASA ISS EVA: Astronaut Sunita Williams on Longest Spacewalk

Image Credit: NASA

NASA astronaut Sunita Williams, Expedition 32 flight engineer, appears to touch the bright sun during the mission’s third session of extravehicular activity (EVA) on Sept. 5, 2012.

During the six-hour, 28-minute spacewalk, Williams was accompanied by Japan Aerospace  Exploration Agency (JAXA) astronaut Aki Hoshide (visible in the reflections of Williams’ helmet visor).

They completed the installation of a Main Bus Switching Unit (MBSU) that was hampered by a possible misalignment and damaged threads where a bolt must be placed.

They also installed a camera on the International Space Station’s robotic arm, Canadarm2.

The ISS typically has four MBSUs in place to relay power for its solar arrays to the rest of the station. Failing to have one of these MBSUs in place meant that two of the station’s eight solar arrays were essentially worthless.

That doesn’t mean the integrity of the station would have been compromised if the MBSU hadn’t been fixed, but those aboard certainly would have had to endure access to only 75% of their usual energy allotment.

It appears that the issue plaguing the installation was metal shavings in the MBSU’s receptacles for the bolts.

Using their improved tools, including the toothbrush, and a pressurized can of nitrogen gas, Williams and Hoshide were able to successfully install the unit around four hours into the spacewalk. Not to be deterred, the duo then went on to replace a faulty camera before turning to the airlock.

In addition to being a bit awesome due to its ingenuity, this particular spacewalk also saw Sunita Williams overtake Peggy Whitson as the record holder for most time spent working in the vacuum of space by a female astronaut.