HN39
NigelOnDraft;
Found another tidbit in BEA's 2nd report, where it discusses thirteen reported events of UAS. What do you make of this:
Quote:
The stall warning triggers when the angle of attack passes a variable threshold value. All of these warnings are explicable by the fact that the airplane is in alternate law at cruise mach and in turbulent zones.
It can be interpreted in a number of ways.
A Stall Warning in Normal Law "needs" some explanation. The Warning is available IMHO (see above), but it should not be triggered due Normal Law's protections - so if it is triggered in Normal Law, a further malfunction or control problem would appear present. The "explanation" at Perpignon was frozen AoA probes. These 13 other cases did not need further "explanation" since the aircraft was in Alternate Law - and as it goes on to say, it is sensitive to control inputs - the 'Stall' trigger AoA is low at high M number.