Originally Posted by
safetypee
AFAIR few if any modern commercial aircraft have a locked in deep stall characteristics.
I would assume the same also assuming an "otherwise healthy aircraft"
I would put money that there ARE some types which have such characteristics if protection systems (such as pushers) were inoperative and the stall progressed far enough. The fundamental aerodynamics of a T-tail make this a not-unlikely hazard in such types, without something to counter the aerodynamics.