FAA AC 91-43:1975 Unreliable Airspeed Indications Alerts pilots to the possibility of erroneous airspeed/Mach indications that may be caused by blocking or freezing of the pitot system, and corrective action to be taken.
Alerts pilots to the possibility of erroneous airspeed/Mach indications that may be caused by blocking or freezing of the pitot system, and corrective action to be taken.