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QFE is a Q code used by pilots and air traffic control to refer to the current air pressure. When dialled into the pilot's altimeter the instrument will read height above the ground at a particular airfield. This setting is used during take off and landing and when flying in the circuit. A mnemonic for the code is "Q Field Elevation".

ATC will update pilots with the QFE when necessary. A typical radio conversation might go:

Here, the pilot of G-WACF (who is on the ground) requests a taxi clearance and is told to taxi to holding point A for runway 25, the circuit is right handed and QFE is 998 millibars. The pilot acknowledges the information by repeating it back to ATC.

In most parts of the world, QFE is given in millibars (or hectopascals, which is the SI unit). In the USA, QFE is given in inches of mercury.

QFE is also an initialism for quick fix engineering.