Originally Posted by
Owain Glyndwr
So far as WOW is concerned I don't think I have ever seen anything from Airbus on the subject - mostly the argument about it being 'abandoned' seems to emanate from PPRuNers speculating...
I'm wondering if that speculation stems from the 1993 LH A320 accident at Warsaw, where the WoW timing was not sufficient to allow deployment of spoilers:
Lufthansa Flight 2904 - Wikipedia, the free encyclopedia
In response to that, Airbus reduced the required pressure on the WoW sensors, but they never abandoned it as a systems input.
OG, I'm almost certain you're correct in that the <60kts AoA NCD flag has nothing to do with determining air/ground mode - it's purely an attempt to enforce the AoA vane manufacturer's specified limitation of minimum 60kts airspeed for valid data, and prevent junk data from being used in FCS calculations.