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The first time was when it was installed, on the dramatic first servicing mission in 1993.
In World War II, he spent 38 months overseas, first servicing aircraft for the Royal Air Force, then working for Douglas Aircraft in the Pacific.
"I thought the first servicing mission was the most difficult until I reviewed this one," said Dr. Edward Weiler, head of space science at NASA. "This will be the toughest".
STS-61 on the space shuttle Endeavour lasted from Dec. 2 to Dec. 13, 1993, and was the first servicing and repair mission to the Hubble Space Telescope (HST), which fixed an optical defect that was causing fuzzy images and restored the telescope to its full capacity.
The first servicing infrastructure considered in this paper, called "Without Depot" (WoD), includes a launch vehicle and a robotic servicer.
As a result (and by Nasa's own admission) Hubble's first servicing mission, STS-61, was to become one of the most challenging and complex crewed spaceflights ever attempted.
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CEO of Professional Science Editing for Scientists @ prosciediting.com