Airspeed corrected for instrument and position error
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In aviation, calibrated airspeed (CAS) is indicated airspeed corrected for instrument and position error.
When flying at sea level under International Standard Atmosphere conditions (15 °C, 1013 hPa, 0% humidity) calibrated airspeed is the same as equivalent airspeed (EAS) and true airspeed (TAS). If there is no wind it is also the same as ground speed (GS). Under any other conditions, CAS may differ from the aircraft's TAS and GS.
Calibrated airspeed in knots is usually abbreviated as KCAS, while indicated airspeed is abbreviated as KIAS.
In some applications, notably British usage, the expression rectified airspeed is used instead of calibrated airspeed.[1]
^Clancy, L. J. (1975) Aerodynamics, pp 31, 32. Pitman Publishing Limited, London. ISBN 0 273 01120 0
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