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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".
10 lip 2023 · Federal Aviation Administration. 800 Independence Avenue, SW. Washington, DC 20591. 866.835.5322 (866-TELL-FAA)
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.
Weather and climate from A to Z. Flight levels. To avoid mid-air collisions, aircraft fly at predefined altitudes known as flight levels. These flight levels are dependent on the atmospheric pressure and vary according to the weather conditions. Aircraft must always be separated by a certain distance to avoid mid-air collisions as they fly.
Aviation Medicine (AVMED) Section. ICAO sets Standards and Recommended Practices (SARPs) for international civil aviation in accordance with the consensus views of its 193 Contracting States in order to achieve an acceptable level of flight safety.
Flight level – A specific altitude expressed in hundreds of feet, such as flight level 250 (25,000 feet). Flight level change – A change in altitude to a specific flight level, as directed by ATC.
FL180 and FL300 stand for Flight Level 180 and Fight Level 300. Flight levels are spaced 100ft apart on an altimeter that is set to the standard sea level pressure (QNE) of 1013.25 hectopascals or 29.92 inches of Mercury.
