DOC AIRBUS | AMM A320FInstallation of the MDDU
TASK 31-38-22-400-001-A
Installation of the MDDU
1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Work Zones and Access Panels
B. Referenced Information
3. Job Set-up
Subtask 31-38-22-860-050-A ** ON A/C NOT FOR ALL
Subtask 31-38-22-420-050-A ** ON A/C NOT FOR ALL
Subtask 31-38-22-862-051-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 04:42:11 UTC
Installation of the MDDU
1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Work Zones and Access Panels
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 210 | CKPT,FWD COMPT BHD TO FLT COMPT BULKHEAD |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 24-41-00-861-002-A | Energize the Aircraft Electrical Circuits from the External Power |
| TASK 24-41-00-861-002-A-01 | Energize the Aircraft Electrical Circuits from the APU |
| TASK 24-41-00-861-002-A-02 | Energize the Aircraft Electrical Circuits from Engine 1(2) |
| TASK 24-41-00-862-002-A | De-energize the Aircraft Electrical Circuits Supplied from the External Power |
| TASK 24-41-00-862-002-A-01 | De-energize the Aircraft Electrical Circuits Supplied from the APU |
| TASK 24-41-00-862-002-A-02 | De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2) |
| TASK 31-38-00-740-002-A | BITE Test of the Multipurpose Disk Drive Unit (MDDU) |
Multipurpose Disk Drive Unit (1TD)Subtask 31-38-22-860-050-A ** ON A/C NOT FOR ALL
A. Make sure that the aircraft electrical circuits from the external power is de-energized (Ref. AMM TASK 24-41-00-862-002).
Subtask 31-38-22-875-051-A ** ON A/C NOT FOR ALL B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:
4. Procedure| PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 121VU | DATA/LOADER/SPLY | 3TD | J16 |
| 121VU | DLS&/DLRB/SPLY | 5TD | J15 |
Subtask 31-38-22-420-050-A ** ON A/C NOT FOR ALL
A. Installation of the MDDU
(1) Clean the component interfaces and the adjacent area.
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Remove the CAP-BLANKING from each electrical connector and receptacle.
(4) Make sure that all the electrical connections are clean and in the correct condition.
(5) Connect the electrical connector (2).
(6) Make sure that the work area is clean and clear of tool(s) and other items in the MDDU housing.
(7) Install the MDDU (1) in its housing.
(8) Tighten the four quarter-turn fasteners (3).
Subtask 31-38-22-861-051-A ** ON A/C NOT FOR ALL Subtask 31-38-22-875-052-A ** ON A/C NOT FOR ALL (1) Clean the component interfaces and the adjacent area.
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Remove the CAP-BLANKING from each electrical connector and receptacle.
(4) Make sure that all the electrical connections are clean and in the correct condition.
(5) Connect the electrical connector (2).
(6) Make sure that the work area is clean and clear of tool(s) and other items in the MDDU housing.
(7) Install the MDDU (1) in its housing.
(8) Tighten the four quarter-turn fasteners (3).
C. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
Subtask 31-38-22-710-050-A ** ON A/C NOT FOR ALL | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 121VU | DATA/LOADER/SPLY | 3TD | J16 |
| 121VU | DLS&/DLRB/SPLY | 5TD | J15 |
D. On the MDDU, make sure that the < < MDDU READY > > indication is shown.
Subtask 31-38-22-740-050-A ** ON A/C NOT FOR ALL 5. Close-upSubtask 31-38-22-862-051-A ** ON A/C NOT FOR ALL