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‐ it is a MAG bearing, if the VOR station is MAG-referenced.
When the ND display mode is ARC or ROSENAV, the FM-computed data (aircraft position,
F-PLN legs, NAVAID position symbol...) is provided along with VOR needles, if selected.
→itisimportant,inthesedisplaymodes,thattheFMdataandtheVORrawdatabe
consistent.
Hence, if the cockpit NORTH REF selection does not match the VOR station reference,
there may be a discrepancy between the VOR raw data and the FM data, unless a
correction is applied to the VOR data.
PRINCIPLE
When the ND is in ARC/ROSE NAV mode, if there is a mismatch between the NORTH REF
selection and the VOR station reference, the VOR needle is equal to the VOR raw bearing
corrected by the local variation at the aircraft's present position.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
OTHER FUNCTIONS - POLAR NAVIGATION
A330/A340 FLEET DSC-22_20-60-130 P 12/22
FCOM 19 AUG 10
In that case, the needle is displayed in magenta , and the "CORR" (corrected) label is displayed
in magenta on the ND's lower corner.
In all other ND display modes (ROSE VOR, ROSE ILS), the VOR raw data (with no correction)
is displayed. MAG or TRU (amber) is displayed next to the VOR identifier, when its reference
does not match the cockpit selection.
EXAMPLE Local variation 65W – TL is a magnetic referenced VOR.
VOR transmitter Cockpit Reference Selection
Reference ND display MODE TRUE MAG DDRMI
TRUE ARROCS/RE OVSOER N/ILASV VOR Raw dVaOtaR RAWDVAOTRA is corrected
MAG ARROCS/RE OVSOER N/ILASV VOR is correVcOteRd RAWDAVTOAR Raw Data
VOR RAWDATA
Note: ND in ROSE VOR/ROSE ILS modes and DDRMI VOR bearing indications are always
identical.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
OTHER FUNCTIONS - POLAR NAVIGATION
A330/A340 FLEET DSC-22_20-60-130 P 13/22
FCOM 19 AUG 10
Applicable to: ,
VOR BEARING DISPLAY
The VOR bearing is measured by the VOR, at the VOR location :
it is a TRUE ‐ bearing, if the VOR station is TRUE-referenced.
‐ it is a MAG bearing, if the VOR station is MAG-referenced.
When the ND display mode is ARC or ROSENAV, the FM-computed data (aircraft position, F-PLN
legs, NAVAID position symbol...) is provided along with VOR needles, if selected.
→itisimportant,inthesedisplaymodes,thattheFMdataandtheVORrawdatabe
consistent.
Hence, if the cockpit NORTH REF selection does not match the VOR station reference,
there may be a discrepancy between the VOR raw data and the FM data, unless a
correction is applied to the VOR data.
PRINCIPLE
When the ND is in ARC/ROSE NAV mode, if there is a mismatch between the NORTH REF
selection and the VOR station reference, the VOR needle is equal to the VOR raw bearing
corrected by the local variation at the aircraft's present position.
In that case, the needle is displayed in magenta , and the "CORR" (corrected) label is displayed
in magenta on the ND's lower corner.
In all other ND display modes (ROSE VOR, ROSE ILS), the VOR raw data (with no correction)
is displayed. MAG or TRUE (amber) is displayed next to the VOR identifier, when its reference
does not match the cockpit selection.
EXAMPLE Local variation 65W – TL is a magnetic referenced VOR.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
OTHER FUNCTIONS - POLAR NAVIGATION
A330/A340 FLEET DSC-22_20-60-130 P 14/22
FCOM 19 AUG 10
VOR transmitter Cockpit Reference Selection
Reference ND display MODE TRUE MAG DDRMI
TRUE ARROCS/RE OVSOER N/ILASV VOR Raw dVaOtaR RAWDVAOTRA is corrected
MAG ARROCS/RE OVSOER N/ILASV VOR is correVcOteRd RAWDAVTOAR Raw Data
VOR RAWDATA
Note: ND in ROSE VOR/ROSE ILS modes and DDRMI VOR bearing indications are always
identical.
Applicable to: ALL
DDRMI
The heading provided by the DDRMI is directly linked to the NORTH REF cockpit selection.
The VOR bearing indications are raw data, as provided by the station.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
OTHER FUNCTIONS - POLAR NAVIGATION
A330/A340 FLEET DSC-22_20-60-130 P 15/22
FCOM 19 AUG 10
PROCEDURES
Applicable to: ALL
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A330/A340机组操作手册 FLIGHT CREW OPERATING MANUAL FCOM 2(19)