Calibrated Airspeed (CAS)

Indicated airspeed corrected for instrument error in the airspeed indicator and position error caused by the static port not sensing true undisturbed static pressure in all flight attitudes. The corrections are typically small at normal cruise speeds but can be significant at high angles of attack (slow flight) or with flaps extended, where the disturbed airflow around the static port introduces greater error. CAS values are found in the aircraft's POH calibration table. CAS is the intermediate step between IAS and TAS in the airspeed correction chain.