Airspeed Indicator
What is airspeed indicator?
The airspeed indicator is a flight instrument that measures the difference between pitot (ram air) pressure and static pressure, displaying the result as indicated airspeed (IAS). It is calibrated to standard sea-level pressure, and its face uses color-coded arcs to mark airspeed ranges for different phases of flight. Think of it as a pressure gauge that reads in knots—the faster you go, the greater the ram-air pressure it senses.
Also known as: ASI, IAS indicator
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