QDM Magnetic heading
QDR Magnetic bearing
QFE Atmospheric pressure at aerodrome elevation
QFI Qualified flight instructor (originally RAF)
QNE Altimeter reading at airfield when subscale is set to 1013.25 millibars
QNH Equivalent MSL pressure when altimeter is set to airport elevation
QRA Quick-reaction alert
QTY Quantity
QUJ True bearing inbound
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Glossary