A Complete Manual for Conducting International Flight Operations
Altimetry
Altimetry
QNH
QNE
An altimeter setting which will result in the aircraft’s altimeter indicating the airport field elevation on the ground.
An altimeter setting which will result in the altimeter indicating altitude reference a standard datum 29.92 inches or 1013 hPA.
QFE
MM
An altimeter setting which will result in the aircraft’s altimeter indicating 0 at airport field elevation (FE= Field Elevation). A QFE altimeter setting shall be given to the pilot by ATC with approach and landing clearances. When an aircraft has been given a clearance as number one to land and is completing its approach and landing 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. All subsequent references to vertical position shall be made in terms of height.
An altimetry reference in mm of mercury.
hPA
An altimetry reference in hecto pascals. Standard hPA is 1013 when referenced to standard.
INCHES
An altimeter referenced to inches of mercury; standard altimeter is 29.92.
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