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Flight Levels (FL) are "officially designated" pressure altitudes at or above the official transition altitude (TA). These TA and FL designations are different by country, or even within different terminal areas of the same country.
Poziom lotu ( ang. Flight level) – powierzchnia baryczna o określonym ciśnieniu oddzielona od innych takich powierzchni o określoną różnicę ciśnienia i odniesiona do specyficznej wartości ciśnienia zwanego ciśnieniem standardowym o wartości 1013,25 hPa (760 mm Hg).
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 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.
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.
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".
Flight level zero shall be located at the atmospheric pressure level of 1013.2hPa. Consecutive flight levels shall be separated by a pressure interval corresponding to at least 500ft (152.4M) in the standard atmosphere.
