Indicated Airspeed
What is indicated airspeed?
Indicated airspeed (IAS) is the speed read directly off the airspeed indicator, uncorrected for instrument or installation (position) errors. Even though air density changes with altitude, a given aircraft at a fixed weight always stalls at the same indicated airspeed, because the indicator is really measuring dynamic pressure. Think of it as the "raw" number on the dial—what you actually see before any corrections are applied.
Also known as: IAS, indicated airspeed
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