Originally Posted by
suninmyeyes
I agree with Glueball that with a standard 5 point Boeing seat harness and in turbulence an incapacitated pilot would not be able to make any forward control input let alone the hefty sustained input required to override an autopilot and pitch down 45 degrees. My only suggestion (and this is pretty remote) would be that someone could have been adjusting his seat and in turbulence it slid forward and jammed the control column forward. I hope it does not turn out to be a nefarious act as it would increase a lot of already inappropriate security restrictions on pilots.
I believe the seats on the 767 have electric adjustment.