The speed shown by the aircraft's airspeed indicator measuring the pressure of the air striking the front of the aircraft as it moves forward. It is affected by atmospheric pressure, being close to the true airspeed at low altitudes and differing more as altitude increases.
The speed of an aircl shown on its pitot static airspeed indicatc brated to reflect standard atmosphere ad compressible flow at sea level uncorrect airspeed system errors.
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.
The airspeed as shown by an airspeed indicator. The reading only agrees with the true airspeed if atmospheric conditions are "standard". As height increases the indicated airspeed falls below the true airspeed.
The uncorrected reading on the airspeed indicator. abbreviation: IAS also called: airspeed Fr: vitesse indiquée
(Abbreviated IAS.) The airspeed read or recorded directly from an airspeed indicator. Indicated airspeed is usually lower than the actual airspeed and must be corrected for both temperature and density to yield true airspeed. The correction is quickly accomplished on an ordinary navigational computer.
Indicated airspeed (IAS) is the airspeed read directly from the airspeed indicator on an aircraft, driven by the pitot-static system. IAS is directly related to calibrated airspeed (CAS), but includes instrument errors and position error.