That’s pretty interesting, in and of itself. That’s a lot of government resources devoted to look at what turned out to be such an obvious mechanical failure.
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I read most of the NTSB report and they looked at every possibility and conducted extensive testing and research. They never treated it as an obvious mechanical failure.
True, and the nitrogen inerting system came out of this investigation, and several wiring changes. It isn’t as sexy, but it was an accident.