Indicated airspeed (IAS)

Definitions

• The direct instrument reading obtained from the airspeed indicator, uncorrected for variations in atmospheric density, installation error, or instrument error. Manufacturers use this airspeed as the basis for determining airplane performance. Takeoff
• Means the speed of an aircraft as shown on its pitot static airspeed indicator calibrated to reflect standard atmosphere adiabatic compressible flow at sea level uncorrected for airspeed system errors.
• Shown on the dial of the instrument airspeed indicator on an aircraft. Directly related to calibrated airspeed (CAS), IAS includes instrument errors and position error.
• The direct instrument reading obtained from the airspeed indicator, uncorrected for variations in atmospheric density, installation error, or instrument error. Manufacturers use this airspeed as the basis for determining airplane performance. Takeoff, landing, and stall speeds listed in the AFM or POH are indicated airspeeds and do not normally vary with altitude or temperature.

References

• 14 C.F.R. Part 1, Federal Aviation Administration, 2026
• Airplane Flying Handbook, Federal Aviation Administration, 2021
• Instrument Flying Handbook, Federal Aviation Administration, 2014
• Weight-Shift Control Aircraft Flying Handbook, Federal Aviation Administration, 2008