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Standard Q Codes

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rc2017's version from 2017-09-05 18:31

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Question Answer
QFEQFE is a pressure datum. A Q code for Query Field Elevation. It is the atmospheric pressure measured at the station level. With QFE set in the altimeter, it will read zero feet on ground. And read Height above ground in flight.
QNHQNH is a pressure datum. A Q code for Query Nautical Height. With QNH set in the altimeter, it will read the station's elevation (height above sea level) on ground. It reads height above MSL- Mean Sea Level in flight. The pressure measured at station then converted to mean sea level pressure. When set on your altimeter it will read your ALTITUDE. QNH is given as a regional pressure setting and should be updated with new ones if you leave its area of reference into a new QNH pressure region. The QNH for a given day is to ensure that safe terrain separation is maintained regardless of the days variation in pressure.
QNEQNE is a reference pressure datum value of 1013.25 millibars/29.92 inches. A Q code for Query Normal Elevation. This STANDARD value is altimeter subsetting when climbing up through the "Transition Level" and will thereafter be read as FLIGHT LEVEL
QFFQFF is station level pressure adjusted according to actual temperatures– used for meteorological charts. QFF is shown as isobars in charts.
QDMQDM is a Q code for Query Direction Magnetic. It is the Magnetic Bearing of Aircraft TO station
QDRQDR is a Q code for Query Direction Radial. It is the Magnetic Bearing of Aircraft FROM station. It is 180 degree reciprocal of QDM
QTEQTE is a Q code from Query True Emanation. It is the True Bearing of Aircraft FROM station. QTE is QDR +/- Variation
QUJQUJ is a Q code from Query Union Jack. It is the True Bearing of Aircraft TO station. QUJ is QDM +/- Variation
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