Nearly six years ago, roughly 250 miles above the Earth, astronauts aboard the International Space Station (ISS) faced a problem.
While trying to install a replacement Main Bus Switching Unit (MBSU) on the outside of the ISS, which is one of the components necessary to provide power to the space station, they had trouble removing one of the bolts that may have been forced on during the installation of the prior unit. Once removed, metal shavings and other debris jammed in the bolt’s housing prevented the successful install of the replacement power unit.
Despite hours of effort during a marathon spacewalk, nothing seemed to work, so the astronauts came in from the dark and cold. While the ISS and crew were not in any immediate danger, there was no way to provide full power without the new MBSU.
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Source: IT Strategy