Originally Posted by Clandestino
That technique, while patently wrong, would not be lethal if center of the stirring movements were set around neutral or moved forward as ADIs have shown pitch increasing. Problem is that average input was heavy nose-up. That's not ham-fistedness. That's confusion.
Not disagreeing with you on the confusion.
I doubt that a person could make the control inputs that the PF did with just two fingers. He had to have palmed the stick. The forces appear to be too high otherwise.
Here is the thought experiment:
Suppose a pilot in a stall such as AF447 was in, places the stick full aft for a period of time and the THS runs up to its limit. If he now releases the stick and allows it to center, will the elevator center or remain at its last (30 degree nose up) position?
The answer is likely not as intuitive as it seems.
First, the aircraft is going to be in either g maintenance mode or pitch rate mode of C*. If airspeed is invalid, which mode is effective?
Next, doesn't the computer tradeoff elevator deflection for THS deflection. If the THS is at its limit, there is nothing to tradeoff in exchange for decreasing elevator deflection, is there?
Now overlay the aircraft's oscillatory pitch behavior in the stall over the top of this. What happens now?