There is another question that comes to mind, and apologies for not remembering this,but, some FADEC’s may have memory chips and although not crash protected,if they survive,may offer evidence of what the collective/engine situation was up to the crash point. Does anyone know if the B model PT-6 FADEC’s have such a chip?
(I might have mentioned that on the initial design of the UH-60,and in spite of the Army saying they didn’t need it,Rich Murphy, who ran the Avionics/Electronic Flight Controls Group at the time, had such a chip designed and installed into the AFCS computer with exactly this sort of use intended. Never got any credit for doing something most of us thought very admirable ).