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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 5/22
FCOM 19 AUG 10
When in 2, and MAG reference is still selected, following events will occur :
the IRSs automatically ‐ revert from MAG to TRUE
‐ an indication TRUE appears on the ND and PFD heading scales. The GRID track information
appears on ND.
‐ an amber caution is triggered on the ECAM :
NAV EXTREME LATITUDE
NORTH REF SEL. . . . . . TRUE
‐ the autopilot might disconnect, an amber caution HDG DISCREPANCY (associated with a
CHECK HDG message on the PFD and on the ND) might be triggered (the IRS do not reach
the polar zone simultaneously).
Note: The messages and cautions are triggered as soon as the first IRS reaches the polar
zone ; once cleared, when the other two IRSs enter the polar zone, the messages
are no longer displayed.
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 6/22
FCOM 19 AUG 10
Applicable to:
FMGS
‐ Flight Guidance part
• When the pilot changes manually the heading reference from MAG to TRUE or vice versa,
‐ if NAV mode is engaged, there is no discontinuity in the lateral guidance.
‐ if HDG (TRK) modes are engaged, the HDG (TRK) target is automatically modified using
current position variation ; thus there is no discontinuity in the lateral guidance.
• if TRUE reference is selected, only CAT 1 ILS approaches may be flown.
• if an automatic MAG/TRUE switching occurs when entering the Polar zone, the autopilot
might disengage due to the fact that, most probably, the automatic switching will not occur
simultaneously for the 3 IRSs. The AP OFF warning is displayed on the ECAM.
‐ 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.
‐ TRU 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, TRU 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 7/22
FCOM 19 AUG 10
Applicable to: ,
FMGS
‐ Flight Guidance part
• When the pilot changes manually the heading reference from MAG to TRUE or vice versa,
‐ if NAV mode is engaged, there is no discontinuity in the lateral guidance.
‐ if HDG (TRK) modes are engaged, the HDG (TRK) target is automatically modified using
current position variation ; thus there is no discontinuity in the lateral guidance.
• if TRUE reference is selected, only CAT 1 ILS approaches may be flown.
• if an automatic MAG/TRUE switching occurs when entering the Polar zone, the autopilot
might disengage due to the fact that, most probably, the automatic switching will not occur
simultaneously for the 3 IRSs. The AP OFF warning is displayed on the ECAM.
　
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