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GM1 Article 2(78) Flight level A pressure type altimeter calibrated in accordance with the Standard Atmosphere, when set to a pressure of 1 013.2 hPa, may be used to indicate flight levels.
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.
Flight level zero is located at the atmospheric pressure level of 1013.2 HPA (29.92 inHg). Consecutive flight levels are separated by a pressure interval corresponding to 500 feet (152.4 metres) in the Standard Atmosphere. Lisboa FIR - Table of transition altitudes and levels.
In order to separate air traffic and prevent collisions, aircraft in cruise flight fly at common pressure levels known as flight levels (abbreviated to FL). 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.
• Poziom lotu - Flight level • Powierzchnia izobaryczna o stałym ciśnieniu odniesiona do szczególnej wartości ciśnienia atmosferycznego 1013,2 hPa (760 mmHg) i oddzielona od innych takich powierzchni określonymi różnicami ciśnienia.
Note: If the level of an aircraft is reported in relation to standard pressure 1013,2 hPa, the words “FLIGHT LEVEL“ precede the level figures. If the level of the aircraft is reported in relation to QNHor height above ground, the figures are followed by the word “METRES“ or “FEET“, as appropriate.
Flying outside the UK. Links to useful safety and regulatory resources. The Skyway Code can be viewed online or downloaded for later use. The latest version will always be available here: The Skyway Code PDF for easy printing. The Skyway Code PDF with easy navigation for on-screen use.
