Airspeed Indicator


The Airspeed Indicator (ASI) is a differential pressure instrument used specifically to measure dynamic pressure. This measurement is displayed as an indicated airspeed in units of either knots or miles per hour.


Memory Aids

Speed Definition Marking
Caution Range Smooth Air Operations Only Yellow Arc
Normal Range Full Operations Allowed Green Arc
Flaps Range Flaps May Be Extended White Arc
VNE Never Exceed Speed Red Line
VNO Maximum Structural Cruise Speed Bottom of Yellow Arc
VFE Maximum Flap Extended Speed Top of White Arc
VS1 Stall Speed (Specified Configuration) Bottom of Green Arc
VS0 Stall Speed (Landing Configuration) Bottom of White Arc


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