Glossary of Acronyms and Abbreviations

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 QFI  Qualified Flying Instructor. Also QHI, Qualified Helicopter Instructor.
 Quadrantal Rule  System of cruising altitudes used in UK uncontrolled airspace below FL250.
 Q-code  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 when on the ground
 With its sub-scale set to the Airport 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 Airport 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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