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IRS ALIGNMENT
When a high latitude flight or polar flight is planned, it is most probably a long range
type of a flight.
DELAY the completion of IRS alignment as long as possible.
Prior to pressing the ALIGN IRS prompt, SLEW the origin airport reference coordinates to the
gate coordinates, if published.
When the origin airport is located between latitude 73 °N and 82 ° (North or South), IRS
alignment should last at least 15 min. Consequently :
SET IRS selectors to NAV
START the STOP WATCH
ADJUST the origin airport coordinates to the gate coordinates, if published.
PRESS the ALIGN IRS prompt, after the 15 min countdown or later.
Note: Beyond 82 ° North or South, no ADIRS alignment is possible.
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 ...) ;
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.
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 16/22
FCOM 19 AUG 10
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.
‐ 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
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 17/22
FCOM 19 AUG 10
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).
‐ Use of ADF
The Polar Zone NDBs are quite powerful, and the bearing can be received at long distances.
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 18/22
FCOM 19 AUG 10
USE these NDBs to check the reasonableness of the FM navigation by comparing the ADF
bearing, that is displayed on the ND, with the FM-computed bearing, that is displayed on the
PROG page.
‐ Flying the pole
• In most cases, the autopilot will be in NAV mode.
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A330/A340机组操作手册 FLIGHT CREW OPERATING MANUAL FCOM 2(20)
