Originally Posted by etudiant
Ignorant question. It has been surprising that the PF control input almost throughout this incident has been NU. Could it be related to the bank that he appeared to be offsetting pretty much throughout as well? The note in the basic control law that suggests keeping the nose up in a tight turn was interesting to this layman.
It doesn't look like if they attempted a "tight turn" in normal law. The bank oscillation was certainly due to AP going off with an induced right roll momentum that should have been trimmed by rudder corrections. The control law switch to alternate caused the roll axis to be direct (and sensitive) as the controls are powerfull (hence, stick moving left and right).
Read below, effect in roll direct and trimming the rudder:
