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When approaching the pole, a CHECK HDG message appears, with the associated ECAM
Procedure.
Disregard the ECAM Procedure.
The message is due to the fact that the IRSs do not reach the pole simultaneously ; thus
the headings do not turn simultaneously from 360 to 180 °.
• in case HDG mode is used (e.g FM1 + 2 failed and Back Up Nav is used)
The autopilot onside the best IRS is to be engaged.
The offside HDG bug (▵) should be disregarded when close to the pole since, the IRS
headings may differ.
‐ Approach
• If CHECK NORTH REF amber message comes up on ND and MCDU, verify that the
NORTH REF pusbutton is selected to the destination airport reference.
Note: The “CHECK NORTH REFERENCE” amber message and the associated alerts
are dependant of a correct coding of the airport North reference (TRUE/MAG) in
the navigation database. The runway orientation displayed on ND is also affected
if the airport North reference is not correctly coded.
• If TRUE is selected for approach, only CATI ILS may be flown.
Applicable to: ,
FLIGHT
TAKEOFF :
If the “CHECK NORTH REF” amber message comes up on the ND and MCDU, verify that the
NORTH REF selection matches the origin airport reference.
Note: The “CHECK NORTH REFERENCE” amber message and the associated alerts are
dependant of a correct coding of the airport North reference (TRUE/MAG) in the
navigation database. The runway orientation displayed on ND is also affected if the
airport North reference is not correctly coded.
CRUISE :
When reaching an area where the heading reference should be changed (oceanic area, airway
or polar track defined in TRUE reference ...) ;
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 19/22
FCOM 19 AUG 10
SELECT TRUE by pressing the NORTH REF pushbutton.
When reaching 65 N with TRUE reference selected, the GRID TRACK is provided on the ND's
upper right box. The ND compass still displays true track and heading.
GRID TRK along with XTK are the cues to be used to monitor the proper lateral guidance.
If the “SELECT TRUE” message appears on the ND/MCDU, this indicates that the aircraft has
reached the Polar zone with MAG reference still selected in the cockpit. Press the NORTH REF
pushbutton to select TRUE.
Note: If this is not achieved, an automatic switching will subsequently occur, along with the
ECAM “NAV EXTREME LATITUDE” caution. The AP will most probably disengage
with associated warnings.
In such a case :
Press the NORTH REF pushbutton to select TRUE.
Re-engage the AP.
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 20/22
FCOM 19 AUG 10
‐ Use of VOR/DME
En route, the VOR/DME are basically used for either FM NAV ACCY crosscheck, or to report
to ATC on a given radial.
The FM NAV ACCY crosscheck is achieved, as usual, by comparing the bearing/distance
displayed on the ND with the bearing/distance displayed on the PROG page.
In case the VOR used is defined in another reference (e.g MAG) than the one selected in
the cockpit (e.g. TRUE), the bearing provided on ND is magenta and is corrected ; the VOR
corrected bearing should be within 5 ° of the FM-computed bearing (taking into consideration
the meridian convergence and the difference of magnetic variation).
→ If there is a doubt, select the NORTH REF to the VOR reference, and check the
bearings.
CAUTION The correction of VOR indications in ROSENAV or ARC ND modes depend
on a correct navigation database coding. If the North reference (TRUE/MAG)
that is coded for the VOR orientation is not correct, the VOR indication
correction will be unduly applied.
If VOR needles are in magenta (CORR), check both the aircraft NORTH REF
selection and the VOR station orientation on the navigation charts.
If the aircraft has to report on a given radial of a VORl, which is defined in a different reference
(e.g MAG) from the cockpit reference (e.g. TRUE), check the RADIAL crossing on the PNF ND
set to ROSE VOR mode or use DDRMI e.g. : aircraft flies NCA 24. (NCA 24is TRUE referenced
route). ATC requests the aircraft to report on RADIAL 357 from YZF (MAG-referenced).
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 21/22
FCOM 19 AUG 10
‐ Flying the pole
　
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