From the FCOM
From the FCOM
Normal Law
HIGH ANGLE OF ATTACK PROTECTION
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 + 1°.
Alternate Law
LOW SPEED STABILITY
An artificial low speed stability replaces the normal angle-of-attack protection. It is available for all slat/flap configurations, and the low speed stability is active from about 5 knots up to about 10 knots above stall warning speed, depending on the aircraft's gross weight and slats/flaps configuration.
A gentle progressive nose down signal is introduced, which tends to keep the speed from falling below these values.
The system also injects bank-angle compensation, so that operation effectively maintains a constant angle of attack.
In addition, audio stall warnings (crickets + "STALL" synthetic voice message) is activated at an appropriate margin from the stall condition.
The PFD speed scale is modified to show a black/red barber pole below the stall warning.
The alpha floor protection is inoperative.