Originally Posted by
MurphyWasRight
3: Some as yet to be revealed flaw that interferes with pilot trim inputs; one possibility is biomechanical factors related to actuation switches after prolonged pulling.
This is unlikely but could explain the final seconds of both accidents.
Last time I was in the sim, doing stalls and falls, I had an unusual attitude recovery from somewhat inverted (120 degrees), nose low. There were several other stalls leading up to this, so the stick shaker had been going quite a bit. On this one, while trying to roll, push, get the speedbrakes out, and trim, my thumb slipped off the trim switch two or three times. I can easily see how hard it would be to pull with some force on the yoke, and keep your thumb on the trim, after a long period of stickshaker activation.