Altimeter Indicated Airspeed Threshold 
Air Facts
MAY 5, 2025
This particular 172 normally cruised at 120 mph indicated airspeed, but with the ice it would barely do 90 mph and that required full throttle! Up we went, trading airspeed for altitude. Passing through 2,800, the altimeter almost stopped, but finally, at 2,900 we punched through the inversion layer! What had happened?
AeroSavvy
OCTOBER 26, 2020
The ADC processes the data and sends it to various aircraft systems including airspeed/Mach indicators (like the SI-800), altimeters, Flight Management Systems (FMS), Autopilot Flight Director System (AFDS), elevator feel computers, and more. This speed is identical to the speed depicted by the Airspeed Pointer.
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