AF 447 Thread No. 9

[Lonewolf_50]

BOAC, it seems to me, from the information I have available, that the audio warning of a stall* begins before the wing actually stalls, in terms of the AoA value that triggers the crickets. Since the crew can't see their AoA, they must rely on such a trigger to become aware of an impending stall if they don't realize that they are approaching one.

(* = or warning of impending stall)

c) References to situations where alpha floor protection in some species of Alt Law might be absent. Is this right?

I reached back to find some info on PPRuNe discussion on alpha floor, and am interested in how confusing references to it seem to remain.

Posts: 339 Alpha Floor is an Autothrust mode that selects Full Power to prevent the a/c from stalling. Full power is maintained and even with full back stick the a/c will not stall. The max angle of attack is Alpha max and in normal law (normal flight mode) this can not be exceded.
http://www.pprune.org/questions/8386...tml#post798663
http://www.pprune.org/tech-log/35588...ml#post4611937
http://www.pprune.org/questions/4705...ml#post6836119