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Definition. Flight levels [3] are described by a number, which is the nominal altitude, or pressure altitude, in hundreds of feet, while being a multiple of 500 ft, therefore always ending in 0 or 5. Therefore, a pressure altitude of 32,000 ft (9,800 m) is referred to as "flight level 320". Flight levels are usually designated in writing as ...
The flight levels correspond to the altitude in 100-ft increments (hectofeet) above the pressure surface of 1,013.25 hPa calculated according to the standard atmosphere. For example, FL050 is the pressure surface 5,000 ft above the pressure surface 1,013.25 hPa. The flight levels are all based on the altimeter setting of 1,013.25 hPa.
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. Pilots and air traffic controllers worldwide adhere to ...
In aviation, 1013.25hPa (hector Pascal) / 29.92 in Hg (inches of Mercury) are referred to as the STANDARD altimeter setting. The Flight Level is written using the two letters FL with the altitude (at standard QNH) in feet, without the two digits at the end: 10000 feet becomes Flight Level 100 = FL100. 6500 feet becomes Flight Level 65 = FL65.
WAFC Upper Wind & Upper Air Temperatures Charts are forecasts of upper winds and upper-air temperatures (for flight levels 50, 100, 140, 180, 240, 300, 340, 390 and 450) and for maximum winds & tropopause heights and temperatures, prepared by a World Area Forecast Centre (WAFC). These charts are issued four times a day and are valid for 6, 12 ...
Flight Level To understand a flight level, we should understand how altitude is measured in an altimeter, which is essentially a calibrated barometer - it measures air pressure, which decreases with increasing altitude. To display correct altitude, a pilot re-calibrates 1 the altimeter from time to time, according to local air pressure.
