Altitude Bust
Any deviation from an assigned altitude or flight level.
Equivalent Terms: Altitude Deviation, Level Bust, Altitude Acquisition Error Altimeter Reference Setting
The reference to which the barometric altimeter is set to indicate a defined altitude as required for the area of operations.
QNH – an altimeter setting derived from a station that will cause the barometric altimeter to indicate a height above mean sea level over that station.
QFE – an altimeter setting derived from a station that will cause the barometric altimeter to indicate the height above that station.
QNE – an altimeter setting at the ISA standard pressure of 1013.2 hPa or 29.92 in Hg. Anti-Icing
A precautionary process for protecting clean aircraft surfaces against the formation of ice and frost, and the accumulation of snow and slush for a limited period of time.
Approval (State or Authority) See State Approval.

Approved Agencies
Operators or AMOs that are approved by the applicable NAA and/or another operator to perform aircraft maintenance.

Approved Data
Approved Data consists of:
ƒ directly applicable Manufacturer's Manuals and procedural information;