I had a seat back failure in my youth (hundred years ago) I was driving my 1939 ford, doing about 40 when suddenly I was in the back seat looking at the cieling! A drunk, driving an Oldsmobile, ran into me. I can still remember pulling myself back up into the normal driving position.
Suppose this is what happened to the pilot in this accident? Will anyone ever know why he crashed? Most failures leave whitness marks, I'll bet carefully examination could determine if it failed in the aft direction.
JJ