DOC AIRBUS | AMM A320FRemoval of the Master Control Unit (MCU)
TASK 25-21-34-000-001-A
Removal of the Master Control Unit (MCU)
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Work Zones and Access Panels
C. Referenced Information
3. Job Set-up
Subtask 25-21-34-861-050-A ** ON A/C NOT FOR ALL Subtask 25-21-34-865-058-A ** ON A/C NOT FOR ALL
Subtask 25-21-34-020-050-B ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.03.31 23:30:19 UTC
Removal of the Master Control Unit (MCU)
WARNING:
DO NOT TOUCH HOT PARTS WITHOUT APPLICABLE GLOVES. HOT PARTS CAN CAUSE AN INJURY.
ZONE: 200
FIN: 100HP1 ** ON A/C NOT FOR ALL
FIN: 100HP2 ** ON A/C NOT FOR ALL
FIN: 101HP ** ON A/C NOT FOR ALL
FIN: 102HP ** ON A/C NOT FOR ALL
FIN: 55HP1 ** ON A/C NOT FOR ALL
FIN: 55HP2 ** ON A/C NOT FOR ALL
1. Reason for the JobFIN: 100HP1 ** ON A/C NOT FOR ALL
FIN: 100HP2 ** ON A/C NOT FOR ALL
FIN: 101HP ** ON A/C NOT FOR ALL
FIN: 102HP ** ON A/C NOT FOR ALL
FIN: 55HP1 ** ON A/C NOT FOR ALL
FIN: 55HP2 ** ON A/C NOT FOR ALL
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | AR | CAP - BLANKING |
| No specific | AR | PLUG - BLANKING |
| No specific | AR | SAFETY CLIP - CIRCUIT BREAKER |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 200 | UPPER HALF FUSELAGE |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 21-24-19-000-001-A | Removal of the Individual Air Outlet |
| TASK 23-73-45-000-001-A | Removal of the Passenger Service Unit |
| TASK 24-42-00-861-001-A | Energize the Ground Service Network from the External Power |
| TASK 35-21-41-000-001-A | Removal of the Emergency Oxygen Containers |
Subtask 25-21-34-861-050-A ** ON A/C NOT FOR ALL Subtask 25-21-34-865-058-A ** ON A/C NOT FOR ALL
B. Open, safety and tag this(these) circuit breaker(s):
Subtask 25-21-34-010-050-A ** ON A/C NOT FOR ALL | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 2000VU | INSEAT POWER-MCU 2 | 59HP | B08 |
| 2000VU | INSEAT POWER-MCU 1 | 58HP | B05 |
| ** ON A/C NOT FOR ALL | |||
| 2000VU | SEAT POWER-MCU 2 | 59HP | B08 |
| 2000VU | SEAT POWER-MCU 1 | 58HP | B05 |
C. Get Access
(1) Open the door of the related overhead stowage compartment.
Subtask 25-21-34-010-050-C ** ON A/C NOT FOR ALL (1) Open the door of the related overhead stowage compartment.
C. Get Access
(1) Remove the bin (Ref. AMM D/O 25-24-41-00) of the related overhead stowage compartment.
(2) Remove the passenger service unit (Ref. AMM TASK 23-73-45-000-001) of the related overhead stowage compartment.
(3) Remove the emergency oxygen container (Ref. AMM TASK 35-21-41-000-001) of the related overhead stowage compartment.
(4) Remove the individual air outlet (Ref. AMM TASK 21-24-19-000-001) of the related overhead stowage compartment.
4. Procedure(1) Remove the bin (Ref. AMM D/O 25-24-41-00) of the related overhead stowage compartment.
(2) Remove the passenger service unit (Ref. AMM TASK 23-73-45-000-001) of the related overhead stowage compartment.
(3) Remove the emergency oxygen container (Ref. AMM TASK 35-21-41-000-001) of the related overhead stowage compartment.
(4) Remove the individual air outlet (Ref. AMM TASK 21-24-19-000-001) of the related overhead stowage compartment.
Subtask 25-21-34-020-050-B ** ON A/C NOT FOR ALL
A. Removal of MCU(s) 55HP1 and/or 55HP2
(1) Make match marks on the components that you disconnect/remove to record their connections/positions. This is important for the subsequent installation procedure.
(2) Release the fasteners (8) and remove the cover (7).
(3) Disconnect the electrical connectors:
(a) Release the spring latches (12).
(b) Disconnect the electrical connectors (1), (10) and (11).
(c) Remove the cap (2).
(d) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(4) Remove the screw (6) and the washer (5).
(5) Hold the MCU (9) tightly and remove the screws (4), the washers (3) and the MCU (9).
Subtask 25-21-34-020-050-E ** ON A/C NOT FOR ALL (1) Make match marks on the components that you disconnect/remove to record their connections/positions. This is important for the subsequent installation procedure.
(2) Release the fasteners (8) and remove the cover (7).
(3) Disconnect the electrical connectors:
(a) Release the spring latches (12).
(b) Disconnect the electrical connectors (1), (10) and (11).
(c) Remove the cap (2).
(d) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(4) Remove the screw (6) and the washer (5).
(5) Hold the MCU (9) tightly and remove the screws (4), the washers (3) and the MCU (9).
A. Removal of Master Control Unit (MCU) 55HP1 and/or 55HP2
(1) Make match marks on the components that you disconnect/remove to record their connections/positions. This is important for the subsequent installation procedure.
(2) Release the fasteners (1) and remove the cover (2).
(3) Remove the clamps (4) and the duct (3) from the ducts (5).
(4) Put a PLUG - BLANKING on each disconnected duct.
(5) Release the fasteners (6) and remove the cover (7).
(6) Disconnect the electrical connectors:
(a) Release the spring latches (16).
(b) Disconnect the electrical connectors (8), (14) and (15).
(c) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(7) Remove the screw (9) and the washer (10).
(8) Hold the MCU (13) tightly and remove the screws (11), the washers (12) and the MCU (13).
Subtask 25-21-34-020-050-G ** ON A/C NOT FOR ALL (1) Make match marks on the components that you disconnect/remove to record their connections/positions. This is important for the subsequent installation procedure.
(2) Release the fasteners (1) and remove the cover (2).
(3) Remove the clamps (4) and the duct (3) from the ducts (5).
(4) Put a PLUG - BLANKING on each disconnected duct.
(5) Release the fasteners (6) and remove the cover (7).
(6) Disconnect the electrical connectors:
(a) Release the spring latches (16).
(b) Disconnect the electrical connectors (8), (14) and (15).
(c) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(7) Remove the screw (9) and the washer (10).
(8) Hold the MCU (13) tightly and remove the screws (11), the washers (12) and the MCU (13).
A. Removal of MCU(s) 55HP1 and/or 55HP2
Master Control Unit (MCU) ** ON A/C NOT FOR ALL
Master Control Unit (MCU) ** ON A/C NOT FOR ALL
Master Control Unit (MCU) ** ON A/C NOT FOR ALL
(1) Make match marks on the components that you disconnect/remove to record their connections/positions. This is important for the subsequent installation procedure.
(2) Release the fasteners (6) and remove the related cover (7).
(3) Disconnect the electrical connectors:
(a) Release the spring latches (11).
(b) Disconnect the electrical connectors (1), (9) and (10).
(c) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(4) Remove the screw (5) and the washer (4).
(5) Hold the related MCU (8) tightly and remove the screws (3), the washers (2) and the MCU (8).
Subtask 25-21-34-560-050-F ** ON A/C NOT FOR ALL Master Control Unit (MCU) ** ON A/C NOT FOR ALL Master Control Unit (MCU) ** ON A/C NOT FOR ALL Master Control Unit (MCU) ** ON A/C NOT FOR ALL (2) Release the fasteners (6) and remove the related cover (7).
(3) Disconnect the electrical connectors:
(a) Release the spring latches (11).
(b) Disconnect the electrical connectors (1), (9) and (10).
(c) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(4) Remove the screw (5) and the washer (4).
(5) Hold the related MCU (8) tightly and remove the screws (3), the washers (2) and the MCU (8).
B. Removal of Configuration Module(s) 100HP1 and/or 100HP2
(1) Hold the configuration module (13) tightly, pull the fasteners (14) and remove the configuration module (13).
(2) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
Subtask 25-21-34-560-050-J ** ON A/C NOT FOR ALL (1) Hold the configuration module (13) tightly, pull the fasteners (14) and remove the configuration module (13).
(2) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
B. Removal of Configuration Module(s) 101HP and/or 102HP
(1) Hold the configuration module (12) tightly and pull the fasteners (13).
(2) Remove the configuration module (12).
(3) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
Subtask 25-21-34-560-050-M ** ON A/C NOT FOR ALL (1) Hold the configuration module (12) tightly and pull the fasteners (13).
(2) Remove the configuration module (12).
(3) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
B. Removal of configuration module(s) 101HP and/or 102HP
(1) Push the two clamps (12) at the same time and remove the related configuration module (13) from the MCU (8).
(2) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
Subtask 25-21-34-560-050-N ** ON A/C NOT FOR ALL (1) Push the two clamps (12) at the same time and remove the related configuration module (13) from the MCU (8).
(2) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
B. Removal of the configuration module 101HP and 102HP
(1) Push the two clamps (17) at the same time and remove the configuration module (18) from the MCU (13).
(2) Put a CAP - BLANKING on each disconnected electrical connector.
(1) Push the two clamps (17) at the same time and remove the configuration module (18) from the MCU (13).
(2) Put a CAP - BLANKING on each disconnected electrical connector.