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OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
OTHER FUNCTIONS - NAVIGATION PROCEDURES WITH FAILURES
A330/A340 FLEET DSC-22_20-60-140 P 3/4
FCOM 19 AUG 10
LOSS OF TWO FMGCS
Applicable to: ALL
• Consequences
‐ 3(2) IRSs/2 BACKUP NAV still available
‐ No AP/FD managed modes
‐ No managed target speed or Mach
• Limitation
None : there are still two independant navigation systems.
Note: IRS positions must be monitored closely. If they differ by more than 20 nm prior entry into
MNPS area, diversion might be envisaged.
PROCEDURES
CHECK/SELECT FM SOURCE selector to NORMAL
SELECT NAV B/UP on both MCDU MENU pages
SELECT NAV on both RMPs
SELECT TRK/FPA and try to engage one autopilot in TRK/ALT mode. (If the 2 FGs are available,
engage the autopilot onside of the best IR).
SELECT proper speed/Mach target and engage A/THR
REFER to BACK UP NAV operation (Refer to STLO-22_10_R-30 BACK UP NAVIGATION MODE)
Specifics for Long Range : USE TRK mode to keep XTK = 0.0 on the BEST IRS side
�� When closing the TO WPT :
READ the OUTBND TRK to the NEXT WPT
COMPARE backup navigation F-PLN distance to the NEXT WPT with the computerized
F-PLN
When sequencing the WPT, SELECT the OUTBND TRK on the FCU and note : Time – GS –
FOB when overhead
ENVISAGE plotting technic on the chart at mid point of the leg.
FMS 1/2 INDEPENDENT OPERATIONS
Applicable to: ALL
• Consequences
no crosstalk between both ‐ FMGCs : they work independently
‐ Any entry on one MCDU must be achieved on the other one
‐ No monitoring between both FMGCs
• Limitation
None
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 4/4
FCOM 19 AUG 10
PROCEDURES
APPLY the normal procedures, but all entries have to be duplicated
Both pilots have to MONITOR separately each FMGC (especially in terms of navigation accuracy).
Note: If the active F-PLN legs are different in both FMGCs, the flight director bars will only be
centered on the engaged autopilot side.
If the autopilot is then changed, the aircraft will turn towards the active leg of the other
FMGC.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
OTHER FUNCTIONS - MCDU BACK UP NAVIGATION
A330/A340 FLEET DSC-22_20-60-150 P 1/8
FCOM 19 AUG 10
GENERAL
Applicable to: ALL
The MCDU NAV B/UP allows to link a MCDU to its associated IRS in order to allow the pilot to
monitor the navigation and to be provided with some basic flight planning functions in case of FM 1 +
2 failure.
CAUTION The MCDU NAV B/UP is to be used only in case of FM 1 + 2 failure. It can be
selected temporarily in case of FM1 or 2 only failure, in order to ensure that the
function is available on the failed side.
When in MCDU NAV B/UP on both sides, one FG at least must be available to
engage AP and A/THR.
The MCDU NAV B/UP function provides :
aircraft position ‐ using onside IRS or IRS 3
‐ F-PLN as memorized in the MCDU
‐ F-PLN display on ND
‐ F-PLN automatic sequencing
‐ AP/FD selected modes, if at least one FG is available
‐ Limited lateral revisions
‐ Mag (True) bearing depending on the pilot selection, from aircraft position to the TO WPT and
associated distance
‐ True track between waypoints
‐ Time estimates computed with current GS from onside IRS
‐ Total time and distance to destination
The following features are not provided :
‐ No DATA BASE available :
• No autotuning, NAVAIDs must be selected on RMP
• No radio position, no GPS position
• No EFIS CTL PANEL options
• No LDG ELEV (must be manually selected on overhead panel)
‐ No performance data :
• No CLB/DES/APP NAV/FINAL modes
• No SPEED MANAGED
• No automatic SPD/MACH change over
‐ Most of predictions are lost :
• No EFOB
• No XTRA
• No ETA at DEST
‐ No multiple lateral F-PLN
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
OTHER FUNCTIONS - MCDU BACK UP NAVIGATION
A330/A340 FLEET DSC-22_20-60-150 P 2/8
FCOM 19 AUG 10
‐ No AF/FD managed modes
‐ No crosstalk between MCDUs : F-PLN revisions have to be achieved on both MCDUs.
BACK UP NAV SELECTION
Applicable to: ALL
FM F-PLN DOWNLOAD IN MCDU
While BACK UP NAV is not active, the FM downloads permanently a condensed form of the
　
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