Q code definition[PDF]


The Q code is a standardized collection of three-letter message encodings initially developed for commercial radiotelegraph communication, and later adopted by other radio services.

They start with the letter "Q".

Although Q codes were created when radio used Morse code exclusively, they continued to be employed after the introduction of voice transmissions.

Q code in aeronautics

Altimeter settings

Q code Definition
QFE Atmospheric pressure at a specified datum such as airfield runway threshold.
QNH Atmospheric pressure at mean sea level (may be either a local, measured pressure or a regional forecast pressure (RPS)).
QNE Indicated altitude at the landing runway threshold when 1013.25hPa (or 29.92inHg) is set in the altimeter’s Kollsman window.

Radio navigation

Q code Definition
QDM Magnetic bearing to a station (ex: VOR)
QDL Series of bearings taken at regular intervals
QDR Magnetic bearing from a station
QFU Magnetic bearing of the runway in use
QGE Controlled descent through clouds
QGH Controlled descent through clouds
QTE True bearing from a station
QTF Position in relation to a point of reference or in latitude and longitude
QUJ True bearing to a station

See also


  • none


  • VID 150259 - Creation
  • VID 256272 - Wiki integration
  • VID 150259 - Update January 2020


  • 13:43, 27 January 2020


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  • The content of this documentation is intended for aviation simulation only and must not be used for real aviation operations.