DOC AIRBUS | AMM A320FInstallation of the Master Control Unit (MCU)
TASK 25-21-34-400-001-A
Installation of the Master Control Unit (MCU)
Self explanatory
2. Job Set-up Information
A. Consumable Materials
B. Work Zones and Access Panels
C. Referenced Information
3. Job Set-up
Subtask 25-21-34-861-051-A ** ON A/C NOT FOR ALL
Subtask 25-21-34-560-051-F ** ON A/C NOT FOR ALL
Subtask 25-21-34-410-050-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.03.31 23:30:20 UTC
Installation of the Master Control Unit (MCU)
WARNING:
BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
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. Consumable Materials
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.05BAB1) | Threadlocking Adhesive-- Low strength Low viscosity - |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 200 | UPPER HALF FUSELAGE |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 20-28-00-912-802-A | Electrical Bonding - General Maintenance Procedure |
| TASK 21-24-19-400-001-A | Installation of the Individual Air Outlet |
| TASK 23-73-45-400-001-A | Installation of the Passenger Service Unit |
| TASK 24-42-00-861-001-A | Energize the Ground Service Network from the External Power |
| TASK 24-42-00-862-001-A | De-energize the Ground Service Network Supplied from the External Power |
| TASK 25-21-00-710-002-A | Operational Test of the In-Seat Power-Supply System (PED Power Supply) |
| TASK 25-21-00-740-001-A | Built-In Test Equipment (BITE) Test of the Master Control Unit (MCU) |
| TASK 35-21-41-400-001-A | Installation of the Emergency Oxygen Containers |
Subtask 25-21-34-861-051-A ** ON A/C NOT FOR ALL
A. Aircraft Maintenance Configuration
(1) Make sure that the ground service network is energized
(Ref. AMM TASK 24-42-00-861-001).
(2) Make sure that the door of the related overhead stowage compartment is open.
Subtask 25-21-34-865-059-A ** ON A/C NOT FOR ALL (1) Make sure that the ground service network is energized
(Ref. AMM TASK 24-42-00-861-001).
(2) Make sure that the door of the related overhead stowage compartment is open.
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 | |||
| 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 |
Subtask 25-21-34-560-051-F ** ON A/C NOT FOR ALL
A. Installation of Configuration Module(s) 100HP1 and/or 100HP2
(1) Remove the CAP-BLANKING from each electrical connector and receptacle.
(2) Make sure that all the electrical connections are clean and in the correct condition.
(3) Make sure that the configuration module is connected to the MCU as follows:
Subtask 25-21-34-560-051-J ** ON A/C NOT FOR ALL (1) Remove the CAP-BLANKING from each electrical connector and receptacle.
(2) Make sure that all the electrical connections are clean and in the correct condition.
(3) Make sure that the configuration module is connected to the MCU as follows:
- 100HP1 to 55HP1
- 100HP2 to 55HP2.
A. Installation of Configuration Module(s) 101HP and/or 102HP
(1) Remove the CAP-BLANKING from each electrical connector and receptacle.
(2) Make sure that all the electrical connections are clean and in the correct condition.
(3) Make sure that the configuration module is connected to the MCU as follows:
Subtask 25-21-34-560-051-M ** ON A/C NOT FOR ALL (1) Remove the CAP-BLANKING from each electrical connector and receptacle.
(2) Make sure that all the electrical connections are clean and in the correct condition.
(3) Make sure that the configuration module is connected to the MCU as follows:
- 101HP to 55HP1
- 102HP to 55HP2.
A. Installation of configuration module(s) 101HP and/or 102HP
(1) Remove the CAP-BLANKING from each electrical connector and receptacle.
(2) Make sure that all the electrical connections are clean and in the correct condition.
(3) Make sure that the configuration module(s) (13) is connected to the MCU(s) as follows:
(5) Make sure that the clamps (12) of the related configuration module (13) are correctly locked.
Subtask 25-21-34-560-051-N ** ON A/C NOT FOR ALL (1) Remove the CAP-BLANKING from each electrical connector and receptacle.
(2) Make sure that all the electrical connections are clean and in the correct condition.
(3) Make sure that the configuration module(s) (13) is connected to the MCU(s) as follows:
- 101HP to 55HP1
- 102HP to 55HP2.
(5) Make sure that the clamps (12) of the related configuration module (13) are correctly locked.
A. Installation of the configuration module 101HP and 102HP
(1) Remove the CAP-BLANKING from each electrical connector and receptacle.
(2) Make sure that all the electrical connections are clean and in the correct condition.
(3) Make sure that the configuration module (18) is connected to the Master Control Unit (MCU) as follows:
(5) Make sure that the clamps (17) of the configuration module (18) are correctly locked.
Subtask 25-21-34-420-050-B ** ON A/C NOT FOR ALL (1) Remove the CAP-BLANKING from each electrical connector and receptacle.
(2) Make sure that all the electrical connections are clean and in the correct condition.
(3) Make sure that the configuration module (18) is connected to the Master Control Unit (MCU) as follows:
- 101HP to 55HP1
- 102HP to 55HP2.
(5) Make sure that the clamps (17) of the configuration module (18) are correctly locked.
B. Installation of MCU(s) 55HP1 and/or 55HP2
(1) When you connect/install the components, refer to the match marks made during the removal procedure.
(2) Put the related MCU (9) in position and install the washers (3) and the screws (4).
(3) Install the washer (5) and the screw (6) (Ref. AMM TASK 20-28-00-912-802).
(4) Connect the electrical connectors:
(b) Make sure that all the electrical connections are clean and in the correct condition.
(c) Install the cap (2).
(d) Apply Threadlocking Adhesive-- Low strength Low viscosity - (Material No.05BAB1) to the electrical connector (10).
(e) Connect the electrical connectors (1), (10) and (11).
(f) Engage the spring latches (12).
(5) Put the cover (7) in position and engage the fasteners (8).
Subtask 25-21-34-420-050-F ** ON A/C NOT FOR ALL (1) When you connect/install the components, refer to the match marks made during the removal procedure.
(2) Put the related MCU (9) in position and install the washers (3) and the screws (4).
(3) Install the washer (5) and the screw (6) (Ref. AMM TASK 20-28-00-912-802).
(4) Connect the electrical connectors:
CAUTION:
MAKE SURE THAT THE SPRING LATCHES CORRECTLY HOLD THE CONNECTOR IN THE FULLY ENGAGED POSITION. THE SPRING LATCHES PREVENT UNWANTED MOVEMENT OF THE CONNECTOR, AND THUS THE RISK OF ARCING, WHICH CAN CAUSE DAMAGE TO THE UNIT.
(a) Remove the CAP-BLANKING from each electrical connector and receptacle.(b) Make sure that all the electrical connections are clean and in the correct condition.
(c) Install the cap (2).
(d) Apply Threadlocking Adhesive-- Low strength Low viscosity - (Material No.05BAB1) to the electrical connector (10).
(e) Connect the electrical connectors (1), (10) and (11).
(f) Engage the spring latches (12).
(5) Put the cover (7) in position and engage the fasteners (8).
B. Installation of Master Control Unit (MCU) 55HP1 and/or 55HP2
(1) When you connect/install the components, refer to the match marks made during the removal procedure.
(2) Put the MCU (13) in position and install the washers (12) and the screws (11).
(3) Install the washer (10) and the screw (9) (Ref. AMM TASK 20-28-00-912-802).
(4) Connect the electrical connectors:
(b) Make sure that all the electrical connections are clean and in the correct condition.
(c) Apply Threadlocking Adhesive-- Low strength Low viscosity - (Material No.05BAB1) to the electrical connector (14).
(d) Connect the electrical connectors (8), (14) and (15).
(e) Lock the electrical connectors (15) with the spring latches (16).
(5) Put the cover (7) in position and lock the fasteners (6).
(6) Remove the blanking plugs from the ducts (3) and (5).
(7) Put the clamps (4) in position.
(8) Install the duct (3) to the ducts (5).
(9) Tighten the clamps (4).
(10) Put the cover (2) in position and lock the fasteners (1).
Subtask 25-21-34-420-050-G ** ON A/C NOT FOR ALL (1) When you connect/install the components, refer to the match marks made during the removal procedure.
(2) Put the MCU (13) in position and install the washers (12) and the screws (11).
(3) Install the washer (10) and the screw (9) (Ref. AMM TASK 20-28-00-912-802).
(4) Connect the electrical connectors:
CAUTION:
MAKE SURE THAT THE SPRING LATCHES CORRECTLY HOLD THE CONNECTOR IN THE FULLY ENGAGED POSITION. THE SPRING LATCHES PREVENT UNWANTED MOVEMENT OF THE CONNECTOR, AND THUS THE RISK OF ARCING, WHICH CAN CAUSE DAMAGE TO THE UNIT.
(a) Remove the CAP-BLANKING from each electrical connector and receptacle.(b) Make sure that all the electrical connections are clean and in the correct condition.
(c) Apply Threadlocking Adhesive-- Low strength Low viscosity - (Material No.05BAB1) to the electrical connector (14).
(d) Connect the electrical connectors (8), (14) and (15).
(e) Lock the electrical connectors (15) with the spring latches (16).
(5) Put the cover (7) in position and lock the fasteners (6).
(6) Remove the blanking plugs from the ducts (3) and (5).
(7) Put the clamps (4) in position.
(8) Install the duct (3) to the ducts (5).
(9) Tighten the clamps (4).
(10) Put the cover (2) in position and lock the fasteners (1).
B. Installation 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) When you connect/install the components, refer to the match marks made during the removal procedure.
(2) Put the related MCU (8) in position and install the washers (2) and the screws (3).
(3) Install the washer (4) and the screw (5) (Ref. AMM TASK 20-28-00-912-802).
(4) Connect the electrical connectors:
(a) Remove the CAP-BLANKING from each electrical connector and receptacle.
(b) Make sure that all the electrical connections are clean and in the correct condition.
(c) Apply Threadlocking Adhesive-- Low strength Low viscosity - (Material No.05BAB1) to the related electrical connector (9).
(d) Connect the electrical connectors (1), (9) and (10).
(5) Put the related cover (7) in position and lock the fasteners (6).
Subtask 25-21-34-869-050-A ** 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) Put the related MCU (8) in position and install the washers (2) and the screws (3).
(3) Install the washer (4) and the screw (5) (Ref. AMM TASK 20-28-00-912-802).
(4) Connect the electrical connectors:
(a) Remove the CAP-BLANKING from each electrical connector and receptacle.
(b) Make sure that all the electrical connections are clean and in the correct condition.
(c) Apply Threadlocking Adhesive-- Low strength Low viscosity - (Material No.05BAB1) to the related electrical connector (9).
(d) Connect the electrical connectors (1), (9) and (10).
CAUTION:
MAKE SURE THAT THE SPRING LATCHES CORRECTLY HOLD THE CONNECTOR IN THE FULLY ENGAGED POSITION. THE SPRING LATCHES PREVENT UNWANTED MOVEMENT OF THE CONNECTOR, AND THUS THE RISK OF ARCING, WHICH CAN CAUSE DAMAGE TO THE UNIT.
(e) Lock the electrical connector(s) (10) with the spring latches (11). (5) Put the related cover (7) in position and lock the fasteners (6).
C. Close the related CBs for each MCU
(1) Make sure that you close all the related CBs for each MCU at the same time.
Subtask 25-21-34-865-054-A ** ON A/C NOT FOR ALL (1) Make sure that you close all the related CBs for each MCU at the same time.
D. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
Subtask 25-21-34-710-050-A ** ON A/C NOT FOR ALL Subtask 25-21-34-740-050-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 |
F. BITE Test of the Master Control Unit
(1) Do the BITE Test of the Master Control Unit (Ref. AMM TASK 25-21-00-740-001).
5. Close-up(1) Do the BITE Test of the Master Control Unit (Ref. AMM TASK 25-21-00-740-001).
Subtask 25-21-34-410-050-A ** ON A/C NOT FOR ALL
A. Close Access
(1) Close the door of the related overhead stowage compartment.
(2) Make sure that the work area is clean and clear of tools and other items.
Subtask 25-21-34-410-050-C ** ON A/C NOT FOR ALL (1) Close the door of the related overhead stowage compartment.
(2) Make sure that the work area is clean and clear of tools and other items.
A. Close Access
(1) Install the bin (Ref. AMM D/O 25-24-41-40) of the related overhead stowage compartment.
(2) Install the passenger service unit (Ref. AMM TASK 23-73-45-400-001) of the related overhead stowage compartment.
(3) Install the emergency oxygen container (Ref. AMM TASK 35-21-41-400-001) of the related overhead stowage compartment.
(4) Install the individual air outlet (Ref. AMM TASK 21-24-19-400-001) of the related overhead stowage compartment.
(5) Make sure that the work area is clean and clear of tools and other items.
Subtask 25-21-34-862-051-A ** ON A/C NOT FOR ALL (1) Install the bin (Ref. AMM D/O 25-24-41-40) of the related overhead stowage compartment.
(2) Install the passenger service unit (Ref. AMM TASK 23-73-45-400-001) of the related overhead stowage compartment.
(3) Install the emergency oxygen container (Ref. AMM TASK 35-21-41-400-001) of the related overhead stowage compartment.
(4) Install the individual air outlet (Ref. AMM TASK 21-24-19-400-001) of the related overhead stowage compartment.
(5) Make sure that the work area is clean and clear of tools and other items.