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20 cze 2017 · Flight levels are a pressure altitude reading, that is a height above a standard datum (MSL at an ambient pressure of 29.92" Hg.). This is used for a standard height reference at high altitudes (>18,000 ft MSL) so crews operating there can make use of a universal reference datum.
Flight levels use QNE or pressure altitude, while altitude references QNH or local pressure adjusted to sea level pressure. Altitudes are used at low levels and flight levels at higher levels. The transition between altitudes and flight levels differs by country and is generally just above the highest obstacle in that country.
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.
In aviation and aviation meteorology, a flight level ( FL) is an aircraft's altitude at standard air pressure, expressed in hundreds of feet.
5 mar 2024 · A flight level is pressure altitude expressed in hundreds of feet. For example, 20,000 feet MSL would be flight level 200 (FL200). All aircraft use the same altimeter setting of 29.92 inches of mercury. This helps aircraft maintain good vertical separation despite local variations in pressure. Class A airspace is instrument flight rules (IFR) only.
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.
Yes, altitude is below transition level, flight level is above transition altitude. Altitude is referencing to actual (local) air pressure, while flight level is against standard pressure 2992 / 1013. The transition altitude is dependent on the location and are definded so both will not mix up.
