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Indicated airspeed
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==IAS vs CAS== The IAS is not the actual speed through the air even when the aircraft is at sea level under International Standard Atmosphere conditions (15 Β°C, 1013 [[pascal (unit)|hPa]], 0% humidity). The IAS needs to be corrected for known instrument and position errors to show true airspeed under those specific atmospheric conditions, and this is the [[Calibrated airspeed|CAS (Calibrated Airspeed).]] Despite this the pilot's primary airspeed reference, the ASI, shows IAS (by definition). The relationship between CAS and IAS is known and documented for each aircraft type and model.
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