It makes sense that the vane is unreliable below 60 KTS, but I'm not seeing how you could have a false stall warning at that speed (absent weight on the wheels). Since the aircraft would be stalled, any warning would be accurate.
Unreliable data might mean that the alarm would not always sound below 60KTS even if the aircraft was stalled. Apparently the designers decided a stall warning that would never work below 60KTS was better than one that would sometimes fail below that speed.
Last edited by Chu Chu; 21st May 2013 at 23:02.