TiberiusKirk;
I was asking about the content of a BBC program that I was unable to see.
Originally Posted by TiberiusKirk
What generates a stall warning? Is it low air-speed detected?
From BEA's 2nd report:
In alternate or direct law, the angle-of-attack protections are no longer available but a stall warning is triggered when the greatest of the valid angle-of-attack values exceeds a certain threshold. In clean configuration, this threshold depends, in particular, on the Mach value in such a way that it decreases when the Mach increases. It is the highest of the valid Mach values that is used to determine the threshold. If none of the three Mach values is valid, a Mach value close to zero is used. For example, it is of the order of 10° at Mach 0.3 and of 4° at Mach 0.8.
The angle of attack is obtained from AoA vanes located on the nose of the airplane.
HN39