Just watched an Air Crash Investigation episode in which the investigators studying the wreckage say that a certain bolt shearing off during flight caused the crash. How can they tell that the broken bolt was during flight and not because of the crash?
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I believe in the case of AA191 they found parts of the broken thrust bushing bolt on or near the runway associated with debris from the detached #1 engine some distance from the crash site. This indicated that the bolt was broken and separated from the aircraft before the aircraft impacted the ground.
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