Thales FMGS - Chapter 3 - MCDU ANOMALIES; MCDU Locked or Blank

FMS DEGRADED OPERATION
MCDU ANOMALIES 1
AIRBUS A318/319/320/321
© THALES AVIONICS S.A.
J43126AA 00
Chapter 3 - MCDU ANOMALIES
3.1. MCDU locked or blank
The MCDU allows communication with FMGC and other subsystems
such ACARS, CFDS.
MCDU may become, blank or frozen.
If this occurs:
MCDU MENU key ........... Press
 If MCDU MENU key does
not respond to pilot
request:
Failure is coming from
MCDU.
− Use the other MCDU and
associated FMGC
− The amber FAIL
annunciator may be
illuminated,
− Consider MCDU reset
through the associated
C/B.
Refer to Airbus FCOM or
Operator's Manual for C/B
location and procedure.
 If MCDU MENU key
responds to pilot request:
− The MCDU is working
properly.
− Failure is linked to the FMS
or the other selected
subsystem.
− If the FMS is concerned,
consider performing a
manual FMS reset through
the associated C/B.
Refer to Airbus FCOM or
Operator's Manual for C/B
location and procedure.
FMS functions
F
A
I
L
MCDU functions
FM1
MCDU MENU
<FMGC (OPP)
<ACARS
<AIDS
<CFDS
RETURN>
OPP FMGC IN PROCESS