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FCOM 19 AUG 10
SYSTEM INTERFACE DIAGRAM
Applicable to: ALL
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - GENERAL
SYSTEM INTERFACE DIAGRAM
Intentionally left blank
A330/A340 FLEET DSC-22_10-20 P 2/2
FCOM 19 AUG 10
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - GENERAL
FMGES MODES OF OPERATION
A330/A340 FLEET DSC-22_10-30 P 1/6
FCOM 19 AUG 10
GENERAL
Applicable to: ALL
The FMGES has four modes of operation:
Dual mode (the normal mode)‐
Independent mode. Each FMGEC being con‐trolled by its associated MCDU
Single mode (using one FMGEC only)‐
Back‐-up navigation mode.
DUAL MODE
Applicable to: ALL
This is the normal mode. The two FMGECs are synchronized: each performs its own computations
and exchanges data with the other through a crosstalk bus.
One FMGEC is the master, the other the slave, so that some data in the slave FMGEC comes from
the master.
All data inserted into any MCDU is transferred to both FMGECs and to all peripherals.
MASTER FMGEC LOGIC:
If one autopilot (AP) ‐is engaged, the related FMGEC is master:
• It uses the onside FD for guidance
• It controls the A/THR
• It controls the FMA 1 and 2
If two APs are engaged, FMGEC1 is master.‐
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - GENERAL
FMGES MODES OF OPERATION
A330/A340 FLEET DSC-22_10-30 P 2/6
FCOM 19 AUG 10
If no AP is engaged and‐
• The FD1 pb is on, then FMGEC1 is master.
• The FD1 pb is off, and FD2 pb on then FMGEC2 is master.
If no AP/FD is engaged, A/THR is controlled by FMGEC1.‐
INDEPENDENT MODE
Applicable to: ALL
The system selects automatically this degraded mode under specific abnormal conditions (e.g.
different database validity on both FMGECs). Each FMGEC works independently from the other and
is linked to the peripherals on its owner side (“on side” peripheral) only.
While this is occuring, “INDEPENDENT OPERATION” message is displayed on both MCDUs
scratchpads. The "IND" annunciator light illuminates amber on the top of the MCDU.
Each MCDU transmits data received from its onside FMGEC. It affects only the onside EFIS
(Electronic Flight Instrument System) and RMP (Radio Management Panel).
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - GENERAL
FMGES MODES OF OPERATION
A330/A340 FLEET DSC-22_10-30 P 3/6
FCOM 19 AUG 10
On POS MONITOR pages and GPS MONITOR pages, FM and GPS position from the opposite
FMGEC are not displayed.
On RAD NAV page and PROG page, navaids tuned on the opposite MCDU are not displayed.
Corresponding fields are blank.
PROCEDURES ON GROUND
　 If each FMGEC is loaded with a different database, the FMGES will only operate in
independent mode only.
CHECK the database number and validity.
CROSSLOAD the database to restore the dual operation.
Crossload function is available on ground only (in preflight or done phase), when an
independent operation is detected.
PROCEDURES IN FLIGHT
DO NOT SWITCH the navigation databases.
MAKE the same entries on both MCDUs to have both AP/FD similar orders.
Both FGs being valid, 2 APs may be engaged for CAT II or CAT III operations.
　 In the event of a go around and when the second AP is disconnected:
ENSURE that the FMGEC in command has correct flight plan orders and an updated nav
database.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - GENERAL
FMGES MODES OF OPERATION
A330/A340 FLEET DSC-22_10-30 P 4/6
FCOM 19 AUG 10
SINGLE MODE
Applicable to: ALL
The system degrades to the single mode when one FMGEC has failed, and the flight crew has
selected the FM source selector to the healthy FM.
While this is occurring:
Corresponding ND displays "OFFSIDE FM CONTROL" amber message‐
Both POS MONITOR pages display the same position (operative FMGEC position)‐
Both FDs are driven by the same FMGEC‐
Any entry on either MCDU is sent to the operative FMGEC.‐
PROCEDURES
　 If a transient failure triggers a single mode of operation:
DO NOT USE the MCDU(s) until the PLEASE WAIT message is suppressed.
SET both NDs on the same range and mode to display the same information from the
operative FMGEC.
When convenient, RESET the failed FMGEC. (Refer to PRO-SUP-22-10 MANUAL FMGES
RESET).
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - GENERAL
FMGES MODES OF OPERATION
　
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