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Flight level and standard pressure. A Flight Level (FL) is the vertical distance of an aircraft above the ISOBARIC SURFACE of 1013.25hPa (hecto Pascal) or 29.92 in Hg (inches of Mercury). An ISOBARIC SURFACE is the invisible landscape that connects all points with the same atmospheric pressure.
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.
Flight levels are usually designated in writing as FLxxx, where xxx is a two- or three-digit number indicating the pressure altitude in units of 100 feet (30 m). In radio communications, FL290 would be pronounced as "flight level two nine(r) zero".
4. The Procedures for Air Navigation Services — Aeronautical Information Management (PANS-AIM, Doc 10066) contains operating practices that are too detailed for inclusion in the standards and recommended practices (SARPs) of Annex 15. The PANS-AIM provides a means for increased harmonization within the aeronautical information
Flight Level (FL) A surface of constant atmosphere pressure which is related to a specific pressure datum, 1013.2hPa, and is separated from other such surfaces by specific pressure intervals. Altitude above sea-level in 100 feet units measured according to a standard atmosphere.
ISA is an internationally developed and recognized model of how air pressure, temperature, and density vary with altitude, and for pilots, this means a QNH of 1013 hPa or 29.92 in Hg.