Originally Posted by
vilas
What Air france delayed installing was not the BUSS because it was simply not deviced yet. Actually BUSS was thought of because of AF447. To my knowledge the pitot static equipment which was installed on AF was prone to icing and a better euipment became available which they delayed installing. Stall warning comes fro purely AoA speed has nothing to do with it. But the low speed stability in alternate law which pitches the nose down comes from speed. When speed is not available control laws change to alternate2 which looses the pitch down capability but stall warning remains available since it comes from AoA.
If the stall warning was purely from the AoA sensor, why did the warning cut out without a large attitude change in the aircraft?