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wikipedia>Neoduder: Changed Definition of QNE to correct one. Also matches definition on main Q-Codes page.

2025-03-07T03:00:39Z

Changed Definition of QNE to correct one. Also matches definition on main Q-Codes page.

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{{short description|Brevity codes used for aviation}}
The '''Aeronautical Code signals''' are radio signal codes. They are part of a larger set of [[Q code|Q Codes]] allocated by the [[ITU-R]]. The QAA–QNZ code range includes phrases applicable primarily to the aeronautical service, as defined by the International Civil Aviation Organisation.

First defined in ICAO publication "Doc 6100-COM/504/1" in 1948 and in "ICAO Procedures for Air Navigation Services, Abbreviations and Codes (PAN
a S-ABC)" [Doc8400-4] (4th edition 1989), the majority of the Q codes have slipped out of common use; for example today reports such as QAU ("I am about to jettison fuel") and QAZ ("I am flying in a storm") would be voice or computerized transmissions. But several remain part of the standard ICAO radiotelephony phraseology in aviation.

{| class="wikitable" summary="Most common Q codes used in aviation for [[altimeter setting]]s, including meaning and sample use"
|+ [[Altimeter setting]]s
! Code !! Meaning !! Sample use
|-
| [[Atmospheric pressure#Mean sea-level pressure|QFE]] || The pressure set on the subscale of the altimeter so that the instrument indicates its height above the reference elevation being used [e.g. aerodrome elevation]<ref name="skybrary.aero">[https://skybrary.aero/articles/altimeter-pressure-settings Altimeter Pressure Settings]</ref> || Runway in use 22 Left, QFE 990 hectopascals
|-
| [[QFF]] || Atmospheric pressure at a place, reduced to MSL using the actual temperature at the time of observation as the mean temperature. ||
|-
| [[QNE]] || During conditions of exceptionally low atmospheric pressure it is not possible to set QFE or QNH on some aircraft altimeters. In these circumstances an aerodrome or runway QNE can be requested.
The QNE is the reading in feet on an altimeter with
the sub-scale set to 1013.2 hPa when the aircraft is at aerodrome or touchdown
elevation.<ref>[https://www.caa.co.uk/our-work/publications/documents/content/cap-493/ CAA CAP493 Manual of Air Traffic Services Part 1]</ref>
|-
| [[QNH]] || The pressure set on the subscale of the altimeter so that the instrument indicates its height above sea level (the altimeter will read runway elevation when the aircraft is on the runway).<ref name="skybrary.aero" /> || Request Leeds QNH
|}

{| class="wikitable" summary="Most common Q codes used in aviation for radio navigation, including meaning and sample use"
|+ Radio Navigation
! Code !! Meaning !! Sample use
|-
| QDM || Magnetic bearing ''to'' a station || (callsign) request QDM (callsign)<ref name="caa.co.uk">[http://www.caa.co.uk/docs/33/CAP%20413%20Radiotelephony%20Manual%2021%202%20complete.pdf CAP 413 Radiotelephony Manual 21 2 complete.pdf] {{webarchive |url=https://web.archive.org/web/20140508223114/http://www.caa.co.uk/docs/33/CAP%20413%20Radiotelephony%20Manual%2021%202%20complete.pdf |date=May 8, 2014 }}, p.12</ref>
|-
| QDL || Series of bearings taken at regular intervals ||
|-
| QDR || Magnetic bearing ''from'' a station || (callsign) request QDR (callsign)<ref name="caa.co.uk"/>
|-
| QFU || Magnetic bearing of the runway in use || Runway 22 in use, QFU 220<ref>[http://acronyms.thefreedictionary.com/QFU QFU on The Free Dictionary]</ref>
|-
| QGE || Distance ||(callsign) request QGE (callsign)<ref name="caa.co.uk" />
|-
| QGH || Controlled Descent through Clouds ([[Royal Air Force]] use) ||
|-
| QTE || True bearing/track ''from'' a station || (callsign) request QTE (callsign)<ref name="caa.co.uk"/>
|-
| QTF || Position in relation to a point of reference or in [[latitude]] and [[longitude]] ||
|-
| QUJ || True bearing/track ''to'' a station ||(callsign) request QUJ (callsign)<ref name="caa.co.uk" />
|}

{| class="wikitable" summary="Most common Q codes used in aviation, including meaning and sample use"
|+ Radio Procedures
! Code !! Meaning !! Sample use
|-
| QGH || controller-interpreted DF let-down procedure, on UHF or VHF<ref>[http://acronyms.thefreedictionary.com/QGH QGH on The Free Dictionary]</ref> ||
|}

==References==
{{Reflist}}

[[Category:Air traffic control]]
[[Category:Amateur radio]]
[[Category:Encodings]]
[[Category:Morse code]]
[[Category:Brevity codes]]
[[Category:1948 in radio]]
[[Category:1948 in aviation]]
[[Category:1989 in radio]]
[[Category:1989 in aviation]]

Aeronautical Code signals - Revision history

Admin: 1 revision imported

wikipedia>Neoduder: Changed Definition of QNE to correct one. Also matches definition on main Q-Codes page.