pointSixtyFive

FLIGHT LEVEL

Pilot/Controller Glossary with JO 7110.65BB, Change 3, effective July 9, 2026 · Official text on faa.gov

A level of constant atmospheric pressure related to a reference datum of 29.92 inches of mercury. Each is stated in three digits that represent hundreds of feet. For example, flight level (FL) 250 represents a barometric altimeter indication of 25,000 feet; FL 255, an indication of 25,500 feet.

See FLIGHT LEVEL ICAO.

ICAO 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.

In the 7110.65

Used in 22 paragraphs of JO 7110.65BB.

  1. 1-2-1Word Meanings
  2. 1-2-6Abbreviations
  3. 2-3-3Oceanic Data Entries
  4. 2-4-17Numbers Usage
  5. 2-7-2Altimeter Setting Issuance Below Lowest Usable Fl
  6. 2-7-3Altimeter Settings Greater Than 31.00 Inches Mercury
  7. 4-3-2Departure Clearances
  8. 4-5-2Flight Direction
  9. 4-5-3Exceptions
  10. 4-5-4Lowest Usable Flight Level
  11. 4-5-5Adjusted Minimum Flight Level
  12. 4-7-5Military Turbojet En Route Descent
  13. 5-5-10Adjacent Airspace
  14. 5-5-11Edge of Scope
  15. 5-13-5Selected Altitude Limits
  16. 8-1-5Altimeter Setting
  17. 8-10-2Vertical Separation
  18. 9-2-14Military Operations Above Fl 600
  19. 9-2-18Awacs/Norad Special Flights
  20. 9-2-20Evasive Action Maneuver
  21. 9-6-1Application
  22. 12-1-5Departure Clearance/Communication Failure