Originally Posted by JD-EE
That brings us back to spurious stall warnings, doesn't it?
Why would that be? At M=0.8 stall warning is set to occur (see 2nd Interim Report) at approx. AoA=4°, alpha-max = 5°, and the real stall is probably between 6° and 7°. The second stall warning occurred "around 6°" at M=0.68, where alpha-max=7.3° and stall probably beyond 9°. I suspect that people who stubbornly maintain that these stall warnings are 'false' don't really understand what they mean. An intermittent warning such as may occur due to AoA- and hence g-variations due to turbulence may be considered 'inappropriate' since it doesn't require recovery action from the crew, but that doesn't mean it is false. It means that the AoA has temporarily exceeded the stall warning threshold.
Takata,
the stall warning threshold has to maintain a certain margin below alpha-max which defines the 1g stall speed. For all Mach numbers greater than 0.275 alpha-max reduces with increasing Mach, and therefore also the stall warning threshold AoA. Just take a look at the
FCOM page presenting Vs1g.