Flight level [ICAO]

{
  "id": "MLC-T-AVN-000413",
  "term": "Flight level [ICAO]",
  "field": "Aviation and air traffic control",
  "definition": "A surface of constant atmospheric pressure which is related to a specific pressure datum, 1013.2 hPa (1013.2 mb), and is separated from other such surfaces by specific pressure intervals.\n\nNOTE: A pressure type altimeter calibrated in accordance with the standard atmosphere:\n\na. When set to a QNH altimeter setting, will indicate altitude;\n\nb. When set to a QFE altimeter setting, will indicate height above the QFE reference datum; and\n\nc. When set to a pressure of 1013.2 hPa\n\n(1013.2 mb), may be used to indicate flight levels.\n\nNOTE: The terms `height' and `altitude,' used in Note 1 above, indicate altimetric rather than geometric heights and altitudes.",
  "subject": "ICAO",
  "references": [
    "FAA Pilot/Controller Glossary"
  ],
  "url": "https://mlchart.com/terminology/aviation/flight-level-icao/"
}