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When FMGS recovery is obtained:
‐ Database cycle may have switched.
‐ The FM position bias is lost. The FM position returns to the MIX IRS position.
‐ Autotuning of VOR/DME are restored, based on the aircraft’s IRS position.
‐ FMGS tuning of the ILS and ADF �� is not possible.
‐ Lateral and vertical managed modes cannot re-engage.
‐ The “CAB PR LDG ELEV FAULT” ECAM message is displayed.
‐ The “REENTER WEIGHT/CG” MCDU message is displayed.
Procedure
When the system has recovered, managed speed may not re-engage, because its target would be
green dot. The PERF/IDLE factor is reset to 00/00. If a PERF/IDLE factor was entered, performance
may be slightly modified after recovery.
‐ SELECT the initial database.
‐ SELECT DIR TO the required downpath waypoint.
‐ SELECT LAT REV at the downpath waypoint and redefine DESTINATION.
‐ SELECT the FUEL PRED page and reenter GW and CG values read on the ECAM fuel page.
‐ SELECT the PROG page and enter CRZ FL.
‐ SELECT the PERF page and enter CI.
‐ CHECK or reengage (as appropriate) the relevant speed/Mach target and vertical mode.
Redefine the flight plan for the remainder of the flight, as the opportunity presents itself.
‐ PERFORM a NAV accuracy check, when possible.
An FM position update will be considered, if MIX IRS and actual positions differ by more than
20 nm.
Both FMGCs are inoperative. ‐ FM and FG capability are lost.
‐ Both NDs display “MAP NOT AVAILABLE”. Navaid tuning is not performed.
‐ AP/FD and A/THR are lost.
‐ Both MCDUs revert to the MCDU MENU page.
A330/A340 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
SUPPLEMENTARY PROCEDURES
AUTO FLIGHT - FMGES RESET AND OTHER ABNORMAL PROCEDURES
A330/A340 FLEET PRO-SUP-22-10 P 4/12
FCOM 19 AUG 10
‐ The following messages are displayed on the ECAM:
“CAB PR LDG ELEV FAULT”
“AUTO FLT AP OFF”, if the AP was engaged
“AUTO FLT A/THR OFF”, if the A/THR was engaged.
‐ “AUTO FLT FM1 + 2 FAULT”.
Procedure
‐ FLY raw data.
‐ TUNE necessary navaids, using the RMPs.
‐ Successively RESET both FMGCs, with the FMGEC reset breakers that are located on the
overhead.
�� If successful, refer to dual reset with loss of data and auto recovery
Note: A recovery will result in the loss of all pilot-entered data.
�� If unsuccessful:
‐ FLY raw data.
‐ SET the FM source to NORM.
‐ SELECT the NAV B/UP prompt on both MCDU DATA pages.
(Refer to 99 Duref Cible FCOM. HOW TO USE, concerning navigation backup operation)
‐ SET the landing elevation of the destination on the overhead.
�� Above 700 ft AGL
ILS tuning may be lost. The loss of ILS tuning, due to a dual reset, will cause a loss of the LOC
and G/S, and the disengagement of the APs and FDs. In this case:
‐ PERFORM a go-around, if not stabilized at 1 000 ft AGL, and if visual references are not
acquired.
�� Below 700 ft AGL
A single or double reset does not affect an ILS approach below 700 ft AGL. ILS frequency is
locked and AP/FDs remain engaged.
‐ CONTINUE the approach.
During a non ILS approach, if the master FMGC fails, AP/FD and managed modes are lost and FDs
engage in basic modes.
‐ PERFORM a go-around, if not stabilized at 1 000 ft, and if visual references are not acquired.
A330/A340 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
SUPPLEMENTARY PROCEDURES
AUTO FLIGHT - FMGES RESET AND OTHER ABNORMAL PROCEDURES
A330/A340 FLEET PRO-SUP-22-10 P 5/12
FCOM 19 AUG 10
MANUAL FMGES RESET
Applicable to: ALL
On rare occasions, the FMGS may require manual resetting.
If this occurs in flight, reset one FMGC at a time.
The aircraft has two reset breakers per FMGC:
‐ The FM reset-breaker resets the flight management part of the FMGC.
‐ The FMGEC reset-breaker resets the flight management, flight guidance, and flight envelope
parts.
Resetting the FM or FMGEC reset-breakers disconnects the onside autopilot.
The FM further resynchronizes to reset one or both FM.
Resetting the FM or FMGC reset-breaker does not increment the reset counter: There is no limitation
to the number of reset-breaker resets.
OTHER ABNORMAL PROCEDURES
Applicable to: ALL
The FMGS may temporarily display erroneous predictions that can affect such data as ECON
speed/Mach, optimum flight level, fuel or time predictions. If erroneous predictions are observed:
On ground, or in flight:
‐ CHECK the cruise temperature (sign and value), the gross weight, and the cruise flight level.
‐ REENTER the same cost index to restart a computation (In descent or approach, a cost index
　
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