Click here to view: Highlights in the History of Aviation and Aerospace - The Past, The Present, and The Future:
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1. The early Lockheed L-188 Electra crashes caused by an unusual vibration in the wing that caused the wing to sometimes fall off--which required a fix with stronger engine nacelles.
2. The early Boeing 727-100 crashes caused by pilots not award of the deep stall issue that caused the plane to go into an uncontrollable stall if the angle of attack (AoA) is too high. That was fixed with better pilot training and the installation of a "stick shaker" to warn of excessive AoA similar to what was installed on production BAC 1-11's.