Originally Posted by FlexibleResponse
if the THS attained a position of full NU (or close to full NU), that it would cause the a/c to stall and furthermore not allow any chance of stall recovery...unless manual use of the pitch trim is used to reposition the THS in the ND sense.
I believe you are referring to the A320 accident at Perpignan. In that accident the condition you describe developed because the AoA vanes were inoperative. If those vanes are free to move, automatic trim stops short of the stall AoA. I believe that at that point it is still possible to recover by normal use of the elevator.