Originally Posted by
LEOCh
[...]
The abnormal nose-pitch in the regulation is during the stall, a possibility if the tail stalls before the wing (as can occur if COG is behind the neutral point).
During pitch-up and high-AoA maneuvers (and in statically stable / dynamically damped aircraft also in neutral flight), the tailplane exerts a downwards force, even in a rearward CoG situation. If it stalls, the force pushing the tail down will reduce, and the nose-up moment will reduce, so it will not result in (additional) nose-up moment.
(as can occur if COG is behind the neutral point)
That must never occur. You cannot get civil airplanes certified otherwise. If it does (e. g. by massive load-shift), catastrophic things will happen, as the 747 crew experienced in Afghanistan a few years ago.
Bernd