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.........it is very, very easy.........to assume that the stall warning in that case is invalid as well.
But we pay subservient homage to all these new-fangled gadgets instead of paying attention to the job of flying the beast, so why should we ever question their demands - like obeying ones' wife !!
If the gadget says you are in a stall, react accordingly and when finally convinced that the idiot was wrong, then kick its ass - but not at the first call. Never heard of High Speed Stall ?
I once got an audible, electronic, "Terrain" warning when correctly established on a Cat III ILS approaching a mountain shrouded airport in low visibility at night. I immediately went into basic drill - i.e. When In Doubt Lash Out, and called for go around power and got the hell out of it. My co-pilot was unimpressed, why ? we were established on the ILS ? Yeah! Right! never heard of a false glide slope, buddy ?
Won't bore you with the rest of it, but my point is why shouldn't the AF crew have assumed that the 'Stall' warning was correct, at least initially?
Remember the crew practising stalls at altitude with the gear remaining retracted, and cancelling the gear unsafe horn every time they closed the throttles. When they eventually prepared to land, and out of the habit of the last hour or so, didn't lower the gear, and when the warning horn sounded yet again the Captain silenced it with the phrase -"shut up, Gringo" then proceeded to land gear up.
If you've paid for a warning device, then obey it, initially at least. If it says Stall, assume that you are in a stall.