Q-code
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Code
system developed when air-to-ground communication was by wireless
telegraphy, enabling many routine phrases and questions to be reduced to
three letters. Now largely redundant, except these:
- QDM
magnetic bearing to a direction-finding station.
- QDR
magnetic bearing from the station.
- QFE
atmospheric pressure at aerodrome elevation. With its sub-scale set to
the aerodrome QFE an altimeter will indicate height above that
airfield.
- QFU
magnetic orientation of runway in use.
- QNE
reading in feet on an altimeter set to 1013.2 millibars (standard
pressure) when the aircraft is at aerodrome elevation.
- QNH
altitude above mean sea level based on local station pressure.
- QTE
true line of position from a direction-finding station.
- QUJ
true bearing
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