Originally Posted by
vilas
Airbus is not speed stable. It is true that in a turn AOA needs to be increased to maintain altitude. Bank angle compensation my be exactly doing that by maintaining a constant required AOA and not necessarily the straight and level AOA. The stall margin will reduce but not an issue at normal bank angles.
You're surmising that it compensates to maintain altitude by increasing AOA, but the quote you're responding to says the opposite: "The system also injects bank-angle compensation, so that operation effectively
maintains a constant angle of attack."
In the context of the ongoing discussion about which safety protections are kept vs. lost in various equipment-failure based downmodes, surely the "compensation" is referring to the maintenance of stall margin, and not its sacrifice in return for the maintenance of altitude, a relatively unimportant goal.
(This stall margin does become an ever-increasingly important issue at slower speeds/higher AOA's no matter how small the bank angle. And a high AOA scenerio is of course the whole point of the "protection" under discussion here. And, it is also a speed stability that very much exists at the edge of the envelope, while not in the middle.)