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• In most cases, the autopilot will be in NAV mode.
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.
TheoffsideHDGbug(▹)shouldbedisregardedwhenclosetothepolesince,theIRS
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.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
OTHER FUNCTIONS - POLAR NAVIGATION
Intentionally left blank
A330/A340 FLEET DSC-22_20-60-130 P 22/22
FCOM 19 AUG 10
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
OTHER FUNCTIONS - NAVIGATION PROCEDURES WITH FAILURES
A330/A340 FLEET DSC-22_20-60-140 P 1/4
FCOM 19 AUG 10
LOSS OF ONE IRS
Applicable to: ALL
• Consequences
‐ 2 IRS/2 FMGCs available
‐ MIX IRS position of each FMGC = its onside IRS position
• Limitations
None
Note: If FMS 1/FMS 2 POS DIFF message comes up, check the IRSs position. If they differ by
more than 20 nm prior entry into MNPS area, consider a diversion.
PROCEDURES
APPLY ECAM procedure (ATT/HDG switching if required)
DETERMINE the best IRS
USE the AP associated to the best IRS.
LOSS OF TWO IRSS
Applicable to: ALL
• Consequences :
‐ 1 IRS/2 FMGC are still available. On navigation system available only
‐ No AP/FD/ATHR
‐ EFIS display on SINGLE SOURCE
• Limitation
‐ If the aircraft is not yet in MNPS area, do not enter.
‐ If the aircraft is within MNPS area, continue but advise ATC of navigation degradation.
PROCEDURES
APPLY ECAM procedure
FLY the aircraft manually (ALTN LAW – PROT LOST)
In order to recover EIS display on both sides, select EIS DMS switching to DMC 1(2) EFIS
SINGLE SOURCE message is displayed on PFD
SELECT TRK/FPV : adjust FCU TRK target so as to keep XTK = 0.0
Specifics for Long Range
APPLY the normal procedures except those linked to unavailability of NAV mode
When closing up the TO WPT : READ the OUTBND TRK the NEXT WPT
When sequencing the waypoint, SELECT the OUTBND TRK on the FCU, and fly the FPV to the
TRK symbol on the horizon.
Note the TIME – GS – FOB when overhead.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
OTHER FUNCTIONS - NAVIGATION PROCEDURES WITH FAILURES
A330/A340 FLEET DSC-22_20-60-140 P 2/4
FCOM 19 AUG 10
ENVISAGE plotting technic on the chart at mid point of the leg.
LOSS OF ONE MCDU
Applicable to: ALL
• Consequences
3 IRSs, 2 FMGCs, 2 MCDUs are still available
Note: MCDU 3 is not able to achieve the Back Up navigation.
• Limitation
None
PROCEDURE
SELECT the failed MCDU off. The MCDU 3 automatically replaces it.
LOSS OF ONE FMGC
Applicable to: ALL
• Consequences
3 IRSs/1 ‐ FMGC/2 MCDUs are still available
‐ Back up navigation is available on the failed side.
• Limitation
None
PROCEDURES
CHECK BACK UP NAV function is available on the failed side
SELECT MCDU MENU page
PRESS NAV B/UP prompt and check that the F-PLN is displayed on the MCDU and ND
SELECT MCDU MENU page back and deselect the NAV B/UP prompt.
SELECT FM SOURCE switch to BOTH ON 1 or 2 position (ECAM procedure)
SELECT the AP associated to the live FMGC
APPLY normal procedures
Note: If the FM fails on the master FG side with NAV mode engaged, the AP disengages ; the
FD reverts to HDG (TRK) and SPD target reverts from managed to selected. Engage the
other AP, NAV mode and SPD managed. Both PFD display the same FD (1FD1 or 2FD2
is displayed).
A330/A340 FLIGHT CREW
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A330/A340机组操作手册 FLIGHT CREW OPERATING MANUAL FCOM 2(22)
