Gary Casey wrote: >>... now I find out that if the pitot tube is plugged BOTH the airspeed indicator and the AOA are rendered useless and there is accident data to prove it. In fact, the failure mode is the worst - the airspeed reads zero and the AOA says "stall," each reinforcing the false information from the other.<< It would seem to take but a trivial effort to put a "No Pitot Pressure" or "Low Pitot Pressure" warning light on the AOA. It would give an indication on the ground, and correctly so, but if it does not disappear during the takeoff run you would know there is trouble afoot.

Charles Keller




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