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The 757 jackscrew gearbox is a scaled down version of the 747 one. There was one failure of the 747 jackscrew:

https://en.wikipedia.org/wiki/National_Airlines_Flight_102

A loose armored vehicle crashed into the jackscrew snapping it. There is no possible recovery from that. I cringe every time I see the video of that one. Horrible.



I thought the main cause of the crash was the cargo weight, didn't know it had also damaged the control hydraulics. Wonder if it could have been recovered if they'd had those controls.




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