W DOC AIRBUS | AMM A320F

Installation of the Centralized Fault Display Interface Unit (CFDIU)

TASK 31-32-34-400-001-A
Installation of the Centralized Fault Display Interface Unit (CFDIU)

ZONE: 127
FIN: 1TW
1. Reason for the Job
Self explanatory
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
No specific
1
ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
 B. Work Zones and Access Panels
ZONE/ACCESS
ZONE DESCRIPTION
127
REAR AVIONIC COMPARTMENT
824
 C. Referenced Information
REFERENCE
DESIGNATION
TASK 31-32-00-600-001-A
Uploading of the Maintenance Filter Data Base to the CFDIU with the Portable Data Loader (SFIM)
TASK 31-32-00-600-001-C
Uploading of the Maintenance Filter Data Base to the CFDIU
TASK 31-32-00-600-001-D
Uploading of the Maintenance Filter Data Base to the CFDIU
TASK 31-32-00-740-002-A
BITE Test of the Centralized Fault Display Interface Unit (CFDIU)
TASK 31-32-00-750-001-A
CFDIU TIME/DATE Initialization
TASK 31-32-00-860-010-A
Procedure to Get Access to the SYSTEM REPORT/TEST NAV Page
TASK 52-41-00-010-002-A
Open the Avionics Compartment Doors for Access
TASK 52-41-00-410-002-A
Close the Avionics Compartment Doors after Access
F Centralized Fault Display Interface Unit (CFDIU)
3. Job Set-up
Subtask 31-32-34-860-050-A
A. Aircraft Maintenance Configuration
   (1) Make sure that the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE is in position at the access door 824 in zone 128.
   (2) Make sure that the access door 824 is open (Ref. AMM TASK 52-41-00-010-002).
Subtask 31-32-34-865-051-A
B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
121VUCFDS/CFDIU/SPLY2TWJ18
121VUCFDS/CFDIU/BACK/UP8TWJ17
** ON A/C NOT FOR ALL
121VUCFDS/CFDIU/SPLY2TWJ41
121VUCFDS/CFDIU/BACK/UP8TWJ40
4. Procedure
Subtask 31-32-34-550-050-A ** ON A/C NOT FOR ALL
A. Reset of the Electrically Erasable Programmable Read Only Memory (EEPROM) to Change the CFDIU Configuration from the Multi-Mode Receiver (MMR) to the Instrument Landing System (ILS) Configuration
NOTE: This procedure is only necessary if you move the Centralized Fault Display Interface Unit (CFDIU) from an aircraft with the MMR installed to an aircraft with the ILS installed.
NOTE: If you do not do this procedure, access to the ILS BITE will not be possible.
   (1) Before you install the CFDIU on the aircraft, do the testing and fault isolation procedure in the work shop to do the reset the EEPROM.
Subtask 31-32-34-420-050-A
B. Installation of the CFDIU
   (1) Clean the component interfaces and the adjacent area.
   (2) Do an inspection of the component interfaces and the adjacent area.
   (3) Remove the blanking caps from the electrical connectors (2).
   (4) Make sure that the electrical connectors (2) are in the correct condition.
   (5) Install the CFDIU (1) on its rack (3).
   (6) Push the CFDIU (1) on its rack (3) to connect the electrical connectors (2).
   (7) Engage the nuts (4) on the lugs (5) and tighten.
Subtask 31-32-34-865-052-A
C. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
121VUCFDS/CFDIU/SPLY2TWJ18
121VUCFDS/CFDIU/BACK/UP8TWJ17
** ON A/C NOT FOR ALL
121VUCFDS/CFDIU/SPLY2TWJ41
121VUCFDS/CFDIU/BACK/UP8TWJ40
Subtask 31-32-34-740-051-A ** ON A/C NOT FOR ALL
D. Do the procedure to get the SYSTEM REPORT/TEST NAV page (Ref. AMM TASK 31-32-00-860-010).
If the SYSTEM REPORT/TEST/NAV page shows ILS1 and ILS2 indications but not MMR1 and MMR2 indications, you must do the steps that follow:
  • Make sure that the engines are shut down
  • Open CFDIU SUPPLY circuit breaker 2TW
  • Open CFDIU BACK UP circuit breaker 8TW
  • Make sure that MMR1 and MMR2 circuit breakers, 42RT1 and 42RT2, are closed
  • After 30 seconds, close CFDIU circuit breakers 2TW and 8TW
  • After 180 seconds, get access to the SYSTEM REPORT/TEST/NAV page (the MMR indications are shown).
NOTE: After a power-up of the CFDS:
  • The CFDS prompt is shown in the MCDU MENU page after approximately 60 seconds.
  • The full CFDS functionality is available after approximately 3 minutes, to make computation of the aircraft configuration possible.
Subtask 31-32-34-740-050-A
E. Do the BITE test of the Centralized Fault Display Interface Unit (Ref. AMM TASK 31-32-00-740-002).
NOTE: If the clock is defective, you can re-initialize the time and date on the MCDU (Ref. AMM TASK 31-32-00-750-001).
Subtask 31-32-34-970-050-A
F. If available, you can load the maintenance filter data base of the CFDIU (Ref. AMM TASK 31-32-00-600-001).
5. Close-up
Subtask 31-32-34-410-050-A
A. Close Access
   (1) Make sure that the work area is clean and clear of tools and other items.
   (2) Close the access door 824 (Ref. AMM TASK 52-41-00-410-002).
   (3) Remove the access platform(s).
[Rev.10 from 2021] 2026.04.01 00:34:07 UTC
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