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OTHER FUNCTIONS - NAVIGATION
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A330/A340 FLEET DSC-22_20-60-120 P 4/4
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 1/22
FCOM 19 AUG 10
GENERAL
Applicable to: ALL
When a flight is scheduled to cross high latitude areas (usually beyond 60 °), various precautions
must be taken regarding ADIRSs, FMGSs, and EIS.
These precautions are mostly dictated by :
• The change from the MAG to TRUE heading (track) reference required by the airway reference
changes in high latitude, or the inability of the IRSs to provide magnetic heading.
• Some particularities linked to the pole overfly.
DESCRIPTION
Applicable to:
ADIRS
ALIGNMENT :
The IRS may be aligned up to latitude 73N without any particular procedures.
Between 73N and 82N (north or south), the required alignment time is greater and a specific
procedure has to be performed.
Beyond 82 ° North or South, no ADIRS alignment is possible.
MAG-TRUE REFERENCE SELECTION :
The ADIRS are able to provide TRUE heading (track), regardless of the aircraft latitude.
The ADIRS are able to provide MAG heading (track) between latitudes 82 °30 N and 60 °30 S,
except in the vicinity of the magnetic pole, as shown below :
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 2/22
FCOM 19 AUG 10
Note: 1. The latitude values given in this diagram are average values. In reality, the polar
area involves different hysteresis, combined with the track angle penetration of the
aircraft in the zone.
2. All airfields where STARs and APPRs are MAG referenced — such as Svalbard —
will be flown with magnetic reference selected.
3. Although located outside the above polar zone, Thule is “TRUE” oriented.
The MAG/TRUE selection is achieved manually by pressing the NORTH REF pushbutton,
or automatically if the aircraft enters the polar zone with MAG still selected. In this case the
following messages and cautions are 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 3/22
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 TRU 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.
Applicable to: ,
ADIRS
ALIGNMENT :
The IRS may be aligned up to latitude 73N without any particular procedures.
Between 73N and 82N (north or south), the required alignment time is greater and a specific
procedure has to be performed.
Beyond 82 ° North or South, no ADIRS alignment is possible.
MAG-TRUE REFERENCE SELECTION :
The ADIRS are able to provide TRUE heading (track), regardless of the aircraft latitude.
The ADIRS are able to provide MAG heading (track) between latitudes 82 °30 N and 60 °30 S,
except in the vicinity of the magnetic pole, as shown below :
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 4/22
FCOM 19 AUG 10
Note: 1. The latitude values given in this diagram are average values. In reality, the polar
area involves different hysteresis, combined with the track angle penetration of the
aircraft in the zone.
2. All airfields where STARs and APPRs are MAG referenced — such as Svalbard —
will be flown with magnetic reference selected.
3. Although located outside the above polar zone, Thule is “TRUE” oriented.
The MAG/TRUE selection is achieved manually by pressing the NORTH REF pushbutton,
or automatically if the aircraft enters the polar zone with MAG still selected. In this case the
following messages and cautions are displayed.
　
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