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Calibrated airspeed (CAS)
Calibrated airspeed is the speed of an aircraft in relation to the air mass it is moving through, after it has been corrected for instrument and position errors. It is calculated by correcting the Indicated Airspeed (IAS) for installation and instrument errors. This calibrated airspeed reading is equal to the True Airspeed (TAS) at sea level. The abbreviation ‘KCAS’ is often used to denote Calibrated Airspeed when measured in knots. In some countries, the term ‘reflected airspeed’ is used instead of calibrated airspeed. CAS is an important parameter used by pilots to operate aircraft safely and efficiently.
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