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In aviation and aviation meteorology, a flight level ( FL) is an aircraft's altitude at standard air pressure, expressed in hundreds of feet.
25 sty 2024 · A flight level (FL) is a standard pressure altitude, expressed as three numbers. Aircraft flying on flight levels all measure their altitude from the same pressure setting, 1013.2 Hpa (or 29.92 InHg). This is based on the principle of something called the International Standard Atmosphere.
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Strictly speaking a flight level is an indication of pressure, not of altitude. Only above the transition level (which depends on the local QNH but is typically 4000 feet above sea level) are flight levels used to indicate altitude; below the transition level feet are used.
Transition Altitude/Flight Level The transition altitude/flight level can be either: • Fixed for the whole country (e.g., FL 180 in the United States); • Fixed for a given airport (as indicated on the approach chart); or, • Variable as a function of QNH (an altimeter setting that causes
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