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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. The air pressure is computed assuming an International Standard Atmosphere pressure of 1013.25 hPa (29.92 inHg ) at sea level , and therefore is not necessarily the same as the aircraft's actual altitude ...
• High pressure: The pressure surface of 1,013.25 hPa is higher than in the normal atmosphere and so the flight level increases. • Low pressure : The pressure surface of 1,013.25 hPa is lower than in the standard atmosphere and so the flight levels are lowered.
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).
10 mar 2024 · This means a level where the pressure is at a particular value throughout the surface of the earth or simply altitude above the mean sea level (MSL). And normal convention is 100 times FL is the altitude at which an aircraft flies. The interval between two flight levels will be 5oo ft or 1000ft. So FL 150, FL155 exists but not FL156 or FL148 ...
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. e.g. FL250 = 25,000 feet above mean sea level when the pressure at sea ...
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With Standard Pressure (1013.2 mb) set, an aircraft altimeter indicates Pressure Altitude (Flight Level), and is used by all aircraft operating above the transition altitude to provide a common datum for vertical measurement.
