DOC AIRBUS | AMM A320FInstallation of the Alternate Braking Control Unit (ABCU)
TASK 32-43-34-400-001-A
Installation of the Alternate Braking Control Unit (ABCU)
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 32-43-34-860-050-A ** ON A/C NOT FOR ALL
Subtask 32-43-34-420-050-B ** ON A/C NOT FOR ALL
Subtask 32-43-34-410-050-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 00:49:15 UTC
Installation of the Alternate Braking Control Unit (ABCU)
FIN: 95GG ** ON A/C NOT FOR ALL
1. Reason for the JobSelf explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | AR | ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 822 |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 20-28-00-912-802-A | Electrical Bonding - General Maintenance Procedure |
| TASK 22-97-00-710-001-A | Operational Test of the LAND CAT III Capability |
| 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 32-42-00-710-001-A | Operational Check of the Normal Braking System |
| TASK 32-43-00-710-002-A | Operational Check to start the Functional Test of the Alternate Braking Automatically (flight simulated) |
| TASK 32-46-00-740-001-A | BITE Test of the BSCU |
| TASK 32-46-00-740-003-A | BITE Test of the BSCU - LRU Identification |
| TASK 32-51-00-720-003-A | Functional Test of the Nose Wheel Steering with the Handwheel |
| TASK 34-10-00-860-004-A | Inertial Reference (IR) Alignment-Procedure |
| TASK 34-10-00-860-004-A-01 | Automatic Inertial Reference (IR) Alignment-Procedure |
| TASK 34-10-00-860-004-A-02 | Inertial Reference (IR) Alignment-Procedure to do a Check of the Links between each Flight Management and Guidance Computer (FMGC) and the three Air Data/Inertial Reference Units (ADIRUs) |
Alternate Braking Control Unit (ABCU) (95GG)Subtask 32-43-34-860-050-A ** ON A/C NOT FOR ALL
A. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).
Subtask 32-43-34-865-051-A ** ON A/C NOT FOR ALL (1) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).
B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:
Subtask 32-43-34-860-051-A ** ON A/C NOT FOR ALL | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 49VU | ABCU &/Y BRK/PRESS IND | 61GG | C10 |
| ** ON A/C NOT FOR ALL | |||
| 121VU | ABCU/HOT BUS/SPLY | 110GG | P30 |
| ** ON A/C NOT FOR ALL | |||
| 121VU | HYDRAULIC/BRAKING AND STEERING/SYS2/SPLY | 4GG | M36 |
| 121VU | HYDRAULIC/BRAKING AND STEERING/SYS2/CTL | 3GG | M35 |
| 121VU | HYDRAULIC/BRAKING AND STEERING/SYS1/CTL | 1GG | M34 |
| 121VU | HYDRAULIC/BRAKING AND STEERING/SYS1/IND AND/SPLY | 2GG | M33 |
| ** ON A/C NOT FOR ALL | |||
| 121VU | ABCU/HOT BUS/SPLY | 110GG | P31 |
C. Aircraft Maintenance configuration
(1) Make sure that the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE is in position at the access door 822.
(2) Make sure that the access door 822 is open.
4. Procedure(1) Make sure that the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE is in position at the access door 822.
(2) Make sure that the access door 822 is open.
Subtask 32-43-34-420-050-B ** ON A/C NOT FOR ALL
A. Installation of the ABCU
(1) Clean the component interface and/or the adjacent area.
(2) Do a visual inspection of the component interface and/or the adjacent area.
(3) Make sure that the bonded points are in the correct condition.
(4) Remove the blanking caps from the electrical connectors.
(5) Make sure that the electrical connectors are clean and in the correct condition.
(6) Put and hold the ABCU (6) on the bracket (7) .
(7) Install the screws (4) and washers (3).
(8) Tighten the screws (4).
(9) Connect the electrical connectors (1) and (2).
(10) Do an electrical bonding at the screws (4) (Ref. AMM TASK 20-28-00-912-802).
Subtask 32-43-34-865-052-A ** ON A/C NOT FOR ALL (1) Clean the component interface and/or the adjacent area.
(2) Do a visual inspection of the component interface and/or the adjacent area.
(3) Make sure that the bonded points are in the correct condition.
(4) Remove the blanking caps from the electrical connectors.
(5) Make sure that the electrical connectors are clean and in the correct condition.
(6) Put and hold the ABCU (6) on the bracket (7) .
(7) Install the screws (4) and washers (3).
(8) Tighten the screws (4).
(9) Connect the electrical connectors (1) and (2).
(10) Do an electrical bonding at the screws (4) (Ref. AMM TASK 20-28-00-912-802).
B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
Subtask 32-43-34-710-050-A ** ON A/C NOT FOR ALL | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 49VU | ABCU &/Y BRK/PRESS IND | 61GG | C10 |
| ** ON A/C NOT FOR ALL | |||
| 121VU | ABCU/HOT BUS/SPLY | 110GG | P30 |
| ** ON A/C NOT FOR ALL | |||
| 121VU | HYDRAULIC/BRAKING AND STEERING/SYS2/SPLY | 4GG | M36 |
| 121VU | HYDRAULIC/BRAKING AND STEERING/SYS2/CTL | 3GG | M35 |
| 121VU | HYDRAULIC/BRAKING AND STEERING/SYS1/CTL | 1GG | M34 |
| 121VU | HYDRAULIC/BRAKING AND STEERING/SYS1/IND AND/SPLY | 2GG | M33 |
| ** ON A/C NOT FOR ALL | |||
| 121VU | ABCU/HOT BUS/SPLY | 110GG | P31 |
C. BITE Test
(1) Do the Operational check to start the functional test of the alternate braking automatically (flight simulated) (Ref. AMM TASK 32-43-00-710-002).
(2) Do the BITE test of the BSCU (Ref. AMM TASK 32-46-00-740-001).
(b) Do the operational test of the LAND CAT III CAPABILITY (Ref. AMM TASK 22-97-00-710-001).
5. Close-up(1) Do the Operational check to start the functional test of the alternate braking automatically (flight simulated) (Ref. AMM TASK 32-43-00-710-002).
(2) Do the BITE test of the BSCU (Ref. AMM TASK 32-46-00-740-001).
NOTE: If the airline operates the aircraft in CAT 3 conditions, do the LAND CAT 3 capability test:
(a) Make sure that the CAT 3 DUAL INOP indication is not shown on the lower ECAM DU with the FADEC GND PWR 1 and 2 pushbutton switches (maintenance panel 50VU) pushed (ON legends on) and the 3 IRs aligned (Ref. AMM TASK 34-10-00-860-004). (b) Do the operational test of the LAND CAT III CAPABILITY (Ref. AMM TASK 22-97-00-710-001).
NOTE: As an alternative procedure, you can do this test without the CFDS (Ref. AMM TASK 32-42-00-710-001) and (Ref. AMM TASK 32-51-00-720-003).
(3) On the center pedestal, on the MCDU, do the bite test of the BSCU (LRU IDENTIFICATION) (Ref. AMM TASK 32-46-00-740-003). Subtask 32-43-34-410-050-A ** ON A/C NOT FOR ALL
A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the access doors 822.
(3) Remove the access platform(s).
(4) De-energize the aircraft electrical cicuits (Ref. AMM TASK 24-41-00-862-002).
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the access doors 822.
(3) Remove the access platform(s).
(4) De-energize the aircraft electrical cicuits (Ref. AMM TASK 24-41-00-862-002).