In relation to alpha protection (FCOM 1 for A319/320):
Under normal law, when the angle of attack becomes greater than alpha prot, the system switches elevator control from normal mode to a protection mode, in which the angle of attack is proportional to sidestick deflection. That is, in the alpha prot range, from alpha prot to alpha max, the sidestick commands alpha directly. However, the angle of attack will not exceed alpha max, even if the pilot gently pulls the sidestick all the way back. If the pilot releases the
sidestick, the angle of attack returns to alpha prot and stays there.
This protection against stall and windshear has priority over all other protections. The autopilot disconnects at alpha prot + 1deg.
Valpha prot, Valpha floor, Valpha max vary according to the weight and the configuration.
To deactivate the angle of attack protection, the pilot must push the sidestick :
– More than 8deg forward, or
– More than 0.5deg forward for at least 0.5 second, when alpha < alpha max.
In addition, below 200 feet, the angle of attack protection is also deactivated, when :
– Sidestick deflection is less than half nose-up, and
– Actual alpha is less than alpha prot – 2deg.
Strangely the A321 does not have the second paragraph regarding below 200 feet...
I think the bottom line is that while Normal Law does give stall protection under the vast majority of situations, multiple probe faults and/or external violent events can put you out of Normal Law...
In Normal Law you can't Stall, but you can still hit the ground maintaining pretty close to max CL. If you tried the same scenarios in a different type of aircraft, I suspect at best the outcome would be no better.