Alpha Max and Alpha Prot are dependent of the weight, config and Mach.
I would think the quoted extract :
In stabilized flight path (out of maneuvers involving an increase in load factor such as turns or pitch variations), the Alpha Max strip (red) on the speed scale of the PFD can hide completely the Alpha Prot strip (black and amber) is related to the flight at higher altitude where Alpha Max is so close to Alpha Prot that the only visible strip on the PFD is the red one.
Regarding the second extract :
With the AutoPilot (AP) engaged, and with the speed brakes in the retracted position, during maneuvers involving an increase in load factor such as turns or pitch variations, the Alpha Prot strip (black and amber) can move rapidly by more than 30 kt, it just make sense that V Alpha Prot increases under load factor, just as V Alpha Stall does. The question, as you put it yourself earlier, could be, why V Alpha Max does not at the same rate ?
Originally Posted by OK465
For the 330/340, IIRC alpha floor won't activate above 0.53 mach.
This would be a Question for
HazelNuts39, at which angle the AoA probes should freeze for Alpha Floor to activate before M.53 is reached ?