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Each MCDU transmits data it receives from its onside FMGC. It affects only the onside EFIS
(Electronic Flight Instrument System) and RMP (Radio Management Panel).
On the POS MONITOR page (and GPS MONITOR page �� ), FMGS position (and GPS position ��
) from the opposite FMGC is not displayed.
On the RAD NAV page (and PROG page, if the FMGS GPS is not installed), navaids tuned on the
opposite MCDU are not displayed. Corresponding fields are blank.
PROCEDURES ON GROUND
�� If each FMGC is loaded with a different database, the FMGS will only operate in
independent mode.
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.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - GENERAL
FMGS MODES OF OPERATION
A318/A319/A320/A321 FLEET DSC-22_10-30 P 4/8
FCOM 19 AUG 10
MAKE the same entries on both MCDUs to have both AP/FDs 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 FMGC in command has correct flight plan orders and an updated nav
database.
Airbus does not recommend pulling one FMGC circuit breaker to force the system to operate
in SINGLE mode.
INDEPENDENT MODE
Applicable to:
,
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4538,,
The system automatically selects this degraded mode under specific abnormal conditions (e.g.
different database validity on both FMGCs).
Both FMGCs work independently and are linked only to peripherals on their own sides of the flight
deck (“onside” peripherals).
When this occurs, the “INDEPENDENT OPERATION” message is displayed on both MCDU
scratchpads. “IND” annunciator on top of the MCDU is lit.
Each MCDU transmits data it receives from its onside FMGC. It affects only the onside EFIS
(Electronic Flight Instrument System) and RMP (Radio Management Panel).
On the POS MONITOR page (and GPS MONITOR page �� ), FMGS position (and GPS position ��
) from the opposite FMGC is not displayed.
On the RAD NAV page, navaids tuned on the opposite MCDU are not displayed. Corresponding
fields are blank.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - GENERAL
FMGS MODES OF OPERATION
A318/A319/A320/A321 FLEET DSC-22_10-30 P 5/8
FCOM 19 AUG 10
PROCEDURES ON GROUND
�� If each FMGC is loaded with a different database, the FMGS will only operate in
independent mode.
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/FDs 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 FMGC in command has correct flight plan orders and an updated nav
database.
Airbus does not recommend pulling one FMGC circuit breaker to force the system to operate
in SINGLE mode.
SINGLE MODE
Applicable to:
The system automatically selects this degraded mode when one FMGC fails.
When this occurs, the failed FMGC displays “OPP FMGC IN PROCESS” in white on the MCDU
scratchpad.
The corresponding ND displays the “SELECT OFFSIDE RNG/MODE” amber message.
Both POS MONITOR pages display the same position (operative FMGC position).
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - GENERAL
FMGS MODES OF OPERATION
A318/A319/A320/A321 FLEET DSC-22_10-30 P 6/8
FCOM 19 AUG 10
Both FDs are driven by the same FMGC. Any entry on either MCDU is sent to the operative FMGC.
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 FMGC.
When convenient, RESET the failed FMGC. (Refer to PRO-SUP-22-10-B Manual FMGS
Reset - General).
SINGLE MODE
Applicable to:
The system automatically selects this degraded mode when one FMGC fails.
When this occurs, the failed FMGC displays “OPP FMGC IN PROCESS” in white on the MCDU
　
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