FMS GENERAL DESCRIPTION
FMGS OPERATION 5
FMGC1 is the Master except when:
− AP2 is engaged singly (normal situation when the RHS pilot is PF).
When both APs are engaged for ILS approach, FMGC1 becomes the
"master".
− FD2 is ON, FD1 is OFF and both APs disengaged.
For DUAL mode operation both FMGCs should remain precisely
synchronized. If this is not possible the FMSs may attempt a
resynchronization.
If resynchronization is successful, the input data previously received
and used by FMS before the resynchronization remains stored in
memory.
See Part IV: FMS Degraded Operation.
SINGLE Mode
The degraded Single mode operation occurs automatically when one
FMGC has failed; the scratchpad amber message OPP FMGC IN
PROCESS is displayed on the MCDU of the failed FMGC. Entries on both
MCDUs go to the operational FMGC.
See Part IV: FMS Degraded Operation.
INDEPENDENT Mode
The degraded Independent mode occurs automatically at power-up if
communication between the FMGCs is not possible, or a mismatch
between FMGCs is detected.
The scratchpad amber message INDEPENDENT OPERATION is
displayed on both MCDUs and the amber IND annunciator on top of the
MCDU screen is illuminated.
The two FMGCs and their associated MCDUs operate independently;
data entered and displayed is only related to the FMGC on that side of
the aircraft. There is no cross-talk.
See Part IV: FMS Degraded Operation.
AIRBUS A318/319/320/321
© THALES AVIONICS S.A.
J43126AA 00
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