FMS DEGRADED OPERATION
OVERVIEW 1
Chapter 1 - OVERVIEW
In the basic configuration, the aircraft is equipped with two FMGCs and
two MCDUs.
FM FG
One FMGC box consists of one FM (Flight Management)
card and one FG (Flight Guidance) card. A failure may
affect the FM or/and the FG card(s).
Additionally, an intersystem bus between the FMSs allows
the FMSs to exchange information and synchronize.
F
F
M
M
G
G
C
C
Dual mode
F
F
M
M
G
G
C
C
1
1
M
M
C
C
D
D
U
U
1
1
F
F
M
M
G
G
C
C
2
2
M
M
C
C
D
D
U
U
2
2
The two FMSs are healthy and no
conditions exist to prevent
communication with each other. It is
the normal operating mode.
Synchronization / Reset
When in Dual mode, synchronization
between the two FMS is performed:
Periodically, in order to keep the Slave
FM synchronized with Master FM along
the flight,
In case of difference or discrepancy between the two FMSs.
There is no cockpit indication that FM synchronization is being
performed.
After any software reset, power transient or FM fail condition,
automatic resynchronization from the 'healthier' FM to the 'unhealthier'
FM is performed.
If errors are detected the FMS attempts to correct the situation by
automatic software resets.
If the error cannot be corrected the system is considered failed. It may
be latched or reset manually.
AIRBUS A318/319/320/321
© THALES AVIONICS S.A.
J43126AA 00
Summary of Contents for FMGS
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