Originally Posted by
JD-EE
Indeed, unless they suddenly magically entered a serious breeze, 100 knots or more, the AoA would not have changed. So why did those stall warnings take place?
Perhaps because :
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.
(BEA interim report #2)
Or was the Mach dependency also rejected because of ADR DISAGREE ?
Last edited by AlphaZuluRomeo; 9th Jun 2011 at 16:02.
Reason: typo