sdf666
It is the initial handoff that killed this plane, imo. I think that, for whatever reason, the PF wanted to climb, and may have not anticipated a lock out of the Autotrim with a robust Pitch UP. So he kept increasing input (NU), and the a/c started to climb, which lessened g forces, and started the THS TRIMMING NU. This caused a very emphatic PITCH UP, one he addressed with insufficient NOSE DOWN ELEVATOR to reverse the climb angle. In short, because (possibly) he had expected some kind of NL assistance with his pull, and getting none, he kept pulling. When it took hold, he lost his surroundings (SA) possibly, and never caught up with, nor understood, the UPSET handling of his a/c.
I am convinced that some variation of this is what started the problem. What cause dit to be ultimately insoluble is left to others.
Sufficient lack of initial SA, a correct, (though perhaps forgotten) behaviour of the THS, and the rest is coffee table.
Thanks for your response. Finally, look again at your initial statement, separate the sequence of both points, and voila! The initial 'disconnect'
IOW. The THS was NOT TRIMMING up with his first NU inputs. K?