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Aviation Glossary :: True Airspeed  Aviation Glossary :: True Airspeed FAA Written Test Preparation
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At Dauntless, our editorial staff maintains the web's largest unified glossary of aviation terms. This glossary is built from a combination of official, quasi-official, and proprietary sources (including original material that we develop oursselves). Uniquely, we often provide multiple definitions of a given term so that you can find that which best applies to you. In order to maximize your learning efficiency, this glossary (and similar ones for our international users) is incresingly fully integrated into our aviation learning apps, including our FAA written test prep and FAA practical test prep software and apps. If you like this glossary, you'll love them with their polished learning environments and world's best and clearest content (please do give them a try.).

True Airspeed
True Airspeed
True Airspeed (TAS): Calibrated airspeed corrected for altitude and nonstandard temperature. Because air density decreases with an increase in altitude, an airplane has to be flown faster at higher altitudes to cause the same pressure difference between pitot impact pressure and static pressure. Therefore, for a given calibrated airspeed, true airspeed increases as altitude increases; or for a given true airspeed, calibrated airspeed decreases as altitude increases.
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source: FAA Airplane Flying Handbook (FAA-H-8083-3A)

Airspeed shown on the airspeed indicator (indicated airspeed) corrected for position error and nonstandard air temperature and pressure.
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source: FAA Aviation Maintenance Technician Airframe Handbook (FAA-H-8083-31)

True airspeed means the airspeed of an aircraft relative to undisturbed air. True airspeed is equal to equivalent airspeed multiplied by (ρ0/ρ) 1/2.
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source: FAA Federal Aviation Regulations (CFR 14 Part 1)

Equivalent airspeed corrected for error due to air density (altitude and temperature). True altitude. The actual height above mean sea level.
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source: FAA Flight Navigator's Handbook (FAA-H-8083-18)

Actual airspeed, determined by applying a correction for pressure altitude and temperature to the CAS.
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source: FAA Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25A)

Actual airspeed, determined by applying a correction for pressure altitude and temperature to the CAS. Because air density decreases with an increase in altitude, an airplane has to be flown faster at higher altitudes to cause the same pressure difference between pitot impact pressure and static pressure. Therefore, for a given calibrated airspeed, true airspeed increases as altitude increases; or for a given true airspeed, calibrated airspeed decreases as altitude increases.
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source: FAA Weight Shift Control Handbook (FAA-H-8083-5)


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