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The altimeter's reference scale is set to the airfield pressure (QFE). What does it indicate during the flight?

  • A

    Pressure altitude.

  • B

    Height above the airfield.

  • C

    Airfield elevation.

  • D

    Altitude above mean sea level (MSL).

Refer to figure.
QFE is the isobaric surface pressure at the reference point.

The altimeter will indicate the height above that reference point at other altitudes.

With the aerodrome QFE set in the subscale, your altimeter will read zero on the highest point on the runway, and, at other altitudes, will read the height above the airfield elevation.

For precision approach runways or instrument runways when the threshold is 7 ft or more below aerodrome elevation, the QFE may be based on the threshold elevation.

With the runway threshold QFE set in the subscale, your altimeter will read zero on the runway threshold.

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