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‐ Flight Management part
• When the aircraft reaches 78 N (60 S), the aircraft position is computed using XYZ earth
centered Cartesian coordinates.
This allows the FM to provide continuously, regardless of latitude, a MIX IRS position, the FM
position being linked to the MIX IRS one.
• During preflight phase, if TRUE reference is selected (take off with TRUE reference is rare),
the pilot is reminded of this selection by :
‐ CHECK NORTH REFERENCE amber message on ND and MCDU scratchpad if the origin
airport reference does not match the one selected by the pilot.
‐ TRUE label above PFD/ND heading scales flashes for 10 s at slat extension.
‐ TRUE NORTH REF memo message flashes for 10 s at engine start or at slat extension.
• Before approach, the pilot is reminded of the correct TRUE/MAG selection by :
‐ CHECK NORTH REF amber message on ND and MCDU scratchpad if the destination
airport reference in data base does not match the one selected by the pilot and the aircraft
reaches the arrival area (approximately 25 nm from destination airport).
‐ If true is selected, TRUE label pulses on PFD/ND during 10 s at slat extension, as well as
the TRUE NORTH REF message on ECAM (as a reminder).
• The tracks and bearings, provided on the MCDU F.PLN, PROG... pages are computed TRUE
or MAG referenced, according to the TRUE/MAG cockpit selection
‐ if selection is TRUE, the bearing and track figures are displayed followed by a T.
• if the pilot wishes to create a PBD, PB/PB waypoint or define a radial (DIR TO INTCPT), the
rule for bearing or radial entry is as follows :
‐ if the bearing is inserted without specifying its reference, the reference is the one
corresponding to the cockpit selection
‐ if the bearing is inserted with its specified reference (M for magnetic, T for true), the
bearing is so defined : e.g. TOU/350 T/15.
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 8/22
FCOM 19 AUG 10
Applicable to:
EIS PFD/ND
TRUE/MAG REFERENCE INDICATION
The TRUE/MAG reference selection is indicated by a specific label displayed above the heading
scales of both EFIS DUs :
• If MAG is selected (which is the most common situation) no label is provided ; the bearing to
the TO waypoint on the ND is displayed with the digits only.
• If true is selected (manually or automatically), a TRU label is provided above PFD/ND
heading scales.
• The GRID TRACK appears on the ND in all modes except in PLAN mode if no approach title
is displayed.
Note: If the ILS scale is displayed on PFD, the TRUE message is shifted on the right side.
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 9/22
FCOM 19 AUG 10
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 10/22
FCOM 19 AUG 10
Applicable to: ,
EIS PFD/ND
TRUE/MAG REFERENCE INDICATION
The TRUE/MAG reference selection is indicated by a specific label displayed above the heading
scales of both EFIS DUs :
• If MAG is selected (which is the most common situation) no label is provided ; the bearing to
the TO waypoint on the ND is displayed with the digits only.
• If true is selected (manually or automatically), a TRUE label is provided above PFD/ND
heading scales.
• The GRID TRACK appears on the ND in all modes except in PLAN mode if no approach title
is displayed.
Note: If the ILS scale is displayed on PFD, the TRUE message is shifted on the right side.
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 11/22
FCOM 19 AUG 10
Applicable to:
ADF AND VOR BEARING DISPLAY
• The ADF needle represents the relative bearing between the aircraft and the NDB.
The ADF relative bearing information (B) is thus independant of the TRUE/MAG selection, and
the needle is always pointing to the same direction whatever is the selection.
Furthermore (provided FM position is accurate) when the EFIS ND is in ARC or ROSE NAV
modes, the ADF needle will point towards the NDB symbol as provided by the FMS.
Note: the same reading is available on the DDRMI.
• The VOR bearing is measured by the VOR, at the VOR location :
it is a TRUE ‐ bearing, if the VOR station is TRUE-referenced.
　
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