The pilot uses the QFE value as an altimeter setting. What is the altitude that will be displayed?
Refer to figure.
QFE: Atmospheric pressure at aerodrome elevation (or at runway threshold)
QNH: Altimeter sub-scale setting to obtain elevation when on the ground
ICAO Doc 8168 Volume III - Aircraft Operations
Chapter 1 - DEFINITIONS
A pressure type altimeter calibrated in accordance with the Standard Atmosphere:
a) when set to a QNH altimeter setting, will indicate altitude;
b) when set to a QFE altimeter setting, will indicate height above the QFE reference datum; and
c) when set to a pressure of 1013.2 hPa, may be used to indicate flight levels.
3.5 APPROACH AND LANDING
3.5.4 When an aircraft which has been given a clearance as number one to land is completing its approach using QFE, the vertical position of the aircraft shall be expressed in terms of the height above the aerodrome datum which was used in establishing obstacle clearance height (OCH). All subsequent references to vertical position shall be made in terms of height.
QFE → Altitude in relation to the air pressure at the reference airfield
QNH → Altitude in relation to mean sea level
QNE → Altitude in relation to the 1013.25 hPa datum
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Austro Control