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Two altimeter settings measuring from different datums.
Also known as: Altimeter setting, Q code
QNH sets an altimeter to read height above sea level and QFE to read height above the aerodrome. Confusing them on approach puts an aircraft's indicated altitude out by the elevation of the airfield, which at a high-altitude aerodrome is a great deal.
Name altimeter settings referenced to mean sea level and to aerodrome elevation respectively.
Contexts: Navigation
Produce readings differing by the aerodrome's elevation, so setting the wrong one gives an altimeter reading wrong by that amount throughout an approach.
Contexts: Navigation
Belong to the Q code, a set of three-letter abbreviations from wireless telegraphy that survives in aviation long after the medium it was built for.
Contexts: Navigation
Three capital letters beginning with Q, followed by a numeric pressure value.