[jacquesgt]

Part of the issue may have been that the plane had slowed down so much that the stall warning stopped (it disengages below a certain airspeed apparently). When he stopped pulling up, the plane sped up and the stall warning started again. Pull up again, plane slows down, stall warning stops.

[ricardobeat]

I wonder if something about this system was changed after that incident - why not keep sounding the stall alarm if the plane ends up outside the flight/sensor envelope? Can’t you assume that it didn’t magically cross the stall zone back into normal flight?

[foldr]

No, because an equally (probably more) likely scenario is that the relevant sensors are giving bad readings.