Indicated Airspeed Pitot Tube 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! As we flew the holding pattern, I realized the airspeed indicator had been showing just 65 mph when we broke through the inversion layer. What had happened?
AeroSavvy
OCTOBER 26, 2020
Location of the Honeywell SI-800 airspeed indicator on a 757/767 panel Inputs All airspeed indicators need two air inputs. Ram air from a pitot tube and static (undisturbed) outside air from a static port, usually a hole on the side of the fuselage.
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