Aviation & Aeronautics
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True Airspeed (approx)

Airspeed corrected for altitude.

Formula

TAS≈IAS(1+h60000)TAS \approx IAS\left(1 + \frac{h}{60000}\right)

Variables

IASIndicated airspeed
hAltitude (ft)

Example

TAS exceeds IAS at altitude

Did You Know?

True airspeed exceeds the cockpit reading at altitude, since thin high air understates the real speed.

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