Originally Posted by
gums
Salute!
Thanks, bernd
Guess many were not there for the megathon AF447 discussion about the stall warning relationship to the Aoa when speed was under 60 knots.
On that night, the plane proved it was very stable in a deeply stalled part of the envelope, and had only a slight change in heading versus a violent yaw/roll . So smooth that the crew didn't understand that they had actually stalled - no stall warning audio due to the 60 knot criteria and the "you can't stall this plane" mentality of many at the time.
Gums sends...
Jus' sec here. AF447 had plenty of stall warning. It only stopped after the crew held it into the deep stall. The crew didn't register the warning or believed it spurious.
On the 60 kt criteria, I find it hard to criticize that design decision. It would get increasingly difficult to get reliable meaningful data from the sensors at that point (i.e. IAS vs CAS spread). And who would have thought an airliner would actually manage to be flown to that point.