FLIGHT LEVEL [ICAO]
|Meaning:||A surface of constant atmospheric pressure which is related to a specific pressure datum, 1013.2 hPa (1013.2 mb), and is separated from other such surfaces by specific pressure intervals.
Note 1: A pressure type altimeter calibrated in accordance with the standard atmosphere:
Note 2: The terms "height" and "altitude," used in Note 1 above, indicate altimetric rather than geometric heights and altitudes.
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