Originally Posted by PJ2
Some here have offered the notion that the THS should stop trimming at some point but what are the all the effects of such a design change? Should it be stopped at a stall indication? In these two accidents that would have been too late as the THS was already at the NU stop.
I agree that inhibiting autotrim would not be a good idea. But how about limiting the range of THS settings it trims to as suggested in my post
here? That would retain autotrim for trimming nose-down in response to sidestick demand, just as it does in normal law above alpha-prot.
EDIT:: In AF447 the THS was at about 3.1 degrees NU at stall warning 2. The effect of limiting the THS to that value is described
here.