Calibrated Airspeed (CAS) is the airspeed indicator reading corrected for instrument and position errors. It’s an important parameter in aircraft design and operation, as it provides a more accurate representation of an aircraft’s true airspeed. CAS is used for various flight calculations and performance considerations.The formula for Calibrated Airspeed (CAS) is as follows:
- CAS is typically measured in knots (kt) in aviation.
- IAS is the Indicated Airspeed, which is the airspeed read directly from the aircraft’s airspeed indicator.
- Instrument Error and Position Error are corrections applied to account for inaccuracies in the airspeed indicator and its location on the aircraft.