DOC AIRBUS | AMM A320FInstallation of the Normal Brake Servovalve
TASK 32-42-48-400-001-A
Installation of the Normal Brake Servovalve
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
C. Expendable Parts
D. Referenced Information
3. Job Set-up
Subtask 32-42-48-941-052-A
Subtask 32-42-48-420-053-A
Subtask 32-42-48-942-051-A
[Rev.10 from 2021]
2026.04.01 12:31:52 UTC
Installation of the Normal Brake Servovalve
WARNING:
MAKE SURE THAT THE FLIGHT CONTROL SAFETY-LOCKS AND THE WARNING NOTICES ARE IN POSITION.
WARNING:
MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING GEAR. THIS WILL PREVENT UNWANTED MOVEMENT OF THE LANDING GEAR, AND THUS POSSIBLE INJURY TO PERSONS AND DAMAGE TO THE AIRCRAFT AND/OR EQUIPMENT.
WARNING:
BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
1. Reason for the JobSelf explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.02ABA1) | Phosphate Ester Hydraulic Fluid-General Power - - |
| (Material No.08BAA9) | Non Aqueous Cleaner-General - - |
| (Material No.14SBA1) | Textile-Lint free Cotton - |
| FIG.ITEM | DESIGNATION | IPC-CSN |
|---|---|---|
| 3 | SEALS | AIPC 32-42-48-01-040 |
| 2 | RINGS | AIPC 32-42-48-01-050 |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 29-00-00-864-001-A | Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action |
| TASK 29-10-00-864-002-A | Depressurize the Yellow Hydraulic System |
| TASK 29-14-00-614-001-A | Depressurization of the Hydraulic Reservoirs |
| TASK 29-14-00-614-002-A | Pressurization of the Hydraulic Reservoirs through the Ground Connector |
| TASK 29-14-00-614-002-A-01 | Pressurization of the Hydraulic Reservoirs with the Auxiliary Power Unit (APU) |
| TASK 29-23-00-860-001-A | Disconnection of the Isolation Coupling of the Power Transfer Unit (PTU) |
| TASK 29-23-00-860-002-A | Connection of the Isolation Coupling of the Power Transfer Unit (PTU) |
| TASK 32-00-00-481-001-A | Installation of the Safety Devices on the Landing Gears |
| TASK 32-42-00-720-002-A | Functional Test of the Tachometers and the Anti-Skid System with the Normal Braking System ON |
| TASK 32-42-00-720-005-A | Functional Test of the Normal Braking System after Removal/Installation of one Normal Servovalve |
| TASK 32-42-00-870-001-A | Bleeding of the Normal Braking at the Brake Units |
Normal-Brake ServovalveSubtask 32-42-48-941-052-A
A. Safety Precautions
(1) Make sure that the SAFETY BARRIER(S) are in position.
(2) Make sure that the ground safety locks are on the landing gear (Ref. AMM TASK 32-00-00-481-001).
(3) On the panel 400VU:
Subtask 32-42-48-860-054-A (1) Make sure that the SAFETY BARRIER(S) are in position.
(2) Make sure that the ground safety locks are on the landing gear (Ref. AMM TASK 32-00-00-481-001).
(3) On the panel 400VU:
- make sure that the landing-gear control-lever 6GA is in the DOWN position
- make sure that the WARNING NOTICE(S) is in position to tell persons not to operate the landing gear.
- the Green hydraulic system
- the Yellow hydraulic system.
B. Aircraft Maintenance Configuration
(1) Make sure that the ACCESS PLATFORM 3M (10 FT) is in position below the applicable servovalve, at zone 730 or 740.
(2) Make sure the isolation coupling of the PTU is disconnected (Ref. AMM TASK 29-23-00-860-001).
(3) Make sure that the Yellow and Green hydraulic systems are de-pressurized (Ref. AMM TASK 29-00-00-864-001) and (Ref. AMM TASK 29-10-00-864-002).
(4) Make sure that the applicable hydraulic reservoirs have been depressurized (Ref. AMM TASK 29-14-00-614-001).
Subtask 32-42-48-865-051-A (1) Make sure that the ACCESS PLATFORM 3M (10 FT) is in position below the applicable servovalve, at zone 730 or 740.
(2) Make sure the isolation coupling of the PTU is disconnected (Ref. AMM TASK 29-23-00-860-001).
(3) Make sure that the Yellow and Green hydraulic systems are de-pressurized (Ref. AMM TASK 29-00-00-864-001) and (Ref. AMM TASK 29-10-00-864-002).
(4) Make sure that the applicable hydraulic reservoirs have been depressurized (Ref. AMM TASK 29-14-00-614-001).
C. 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 | HYDRAULIC/G HYD/PUMP ENG1/MONG | 1702GK | R34 |
| ** ON A/C 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 | HYDRAULIC/G HYD/PUMP ENG1/MONG | 1702GK | R33 |
Subtask 32-42-48-420-053-A
A. Preparation for Installation
(1) Clean the component interface and/or the adjacent area with a Textile-Lint free Cotton - (Material No.14SBA1) made moist with Non Aqueous Cleaner-General - - (Material No.08BAA9) .
(2) Make sure that the parts retained from the removed component are clean and in the correct condition.
(3) Do an inspection of the component interfaces and the adjacent area.
(4) Examine the interface of the servovalve and the normal brake manifold for the correct condition.
(5) Remove the CAP - BLANKING from the electrical connector (4).
(6) If you are to install the servovalve 15GG(16GG), remove the CAP - BLANKING from the electrical connector (4) of the servovalve 17GG(18GG).
(7) Remove the PLUG - BLANKING from the hydraulic line end-fittings.
(8) Make sure that the hydraulic line end-fittings are serviceable.
(9) Lubricate the new AIPC 32-42-48-01-040 SEALS (3) and the new AIPC 32-42-48-01-050 RINGS (2) with Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) .
Subtask 32-42-48-420-051-A (1) Clean the component interface and/or the adjacent area with a Textile-Lint free Cotton - (Material No.14SBA1) made moist with Non Aqueous Cleaner-General - - (Material No.08BAA9) .
(2) Make sure that the parts retained from the removed component are clean and in the correct condition.
(3) Do an inspection of the component interfaces and the adjacent area.
(4) Examine the interface of the servovalve and the normal brake manifold for the correct condition.
(5) Remove the CAP - BLANKING from the electrical connector (4).
(6) If you are to install the servovalve 15GG(16GG), remove the CAP - BLANKING from the electrical connector (4) of the servovalve 17GG(18GG).
(7) Remove the PLUG - BLANKING from the hydraulic line end-fittings.
(8) Make sure that the hydraulic line end-fittings are serviceable.
(9) Lubricate the new AIPC 32-42-48-01-040 SEALS (3) and the new AIPC 32-42-48-01-050 RINGS (2) with Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) .
NOTE: If the servovalve is a replacement, then it is supplied with the rings and seals installed.
B. Installation of the Normal Brake Servovalve
(1) Install the seals (3) and the rings (2) on the servovalve (1).
(2) Remove the COVER - PROTECTION and the PLUG - BLANKING from the normal brake manifold.
(3) Put the servovalve (1) in position on the normal brake manifold and install the bolts (5).
(4) TORQUE the bolts (5) to between 0.45 and 0.35 m.daN (39.82 and 30.97 lbf.in )
.
Subtask 32-42-48-760-050-A (1) Install the seals (3) and the rings (2) on the servovalve (1).
(2) Remove the COVER - PROTECTION and the PLUG - BLANKING from the normal brake manifold.
(3) Put the servovalve (1) in position on the normal brake manifold and install the bolts (5).
(4) TORQUE the bolts (5) to between 0.45 and 0.35 m.daN (39.82 and 30.97 lbf.in )
. C. Electrical Bonding Resistance Test
(1) Use a MILLIOHMMETER ACCURACY 0.005 OHM to measure the bonding resistance between:
(a) The MLG forward pintle bearing and the applicable brake manifold servo-valve connector shell. The bonding resistance must be less than 20 milliohms.
(2) Connect the electrical connector (4) on the servovalve (1).
(3) If you installed the servovalve 15GG(16GG) connect the connector (4) on the servovalve 17GG(18GG).
Subtask 32-42-48-860-055-A (1) Use a MILLIOHMMETER ACCURACY 0.005 OHM to measure the bonding resistance between:
(a) The MLG forward pintle bearing and the applicable brake manifold servo-valve connector shell. The bonding resistance must be less than 20 milliohms.
(2) Connect the electrical connector (4) on the servovalve (1).
(3) If you installed the servovalve 15GG(16GG) connect the connector (4) on the servovalve 17GG(18GG).
D. Aircraft Maintenance Configuration
(1) Connect the isolation coupling of the PTU (Ref. AMM TASK 29-23-00-860-002).
(2) Pressurize the applicable hydraulic reservoirs (Ref. AMM TASK 29-14-00-614-002).
Subtask 32-42-48-865-052-A (1) Connect the isolation coupling of the PTU (Ref. AMM TASK 29-23-00-860-002).
(2) Pressurize the applicable hydraulic reservoirs (Ref. AMM TASK 29-14-00-614-002).
E. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
Subtask 32-42-48-870-050-A Subtask 32-42-48-720-050-A | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 121VU | HYDRAULIC/G HYD/PUMP ENG1/MONG | 1702GK | R34 |
| ** ON A/C 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 | HYDRAULIC/G HYD/PUMP ENG1/MONG | 1702GK | R33 |
G. Test
(1) Do a functional test of the Normal Braking after removal/installation of one servovalve (Ref. AMM TASK 32-42-00-720-005).
(2) If necessary, do a functional test of the tachometers (Ref. AMM TASK 32-42-00-720-002).
5. Close-up(1) Do a functional test of the Normal Braking after removal/installation of one servovalve (Ref. AMM TASK 32-42-00-720-005).
(2) If necessary, do a functional test of the tachometers (Ref. AMM TASK 32-42-00-720-002).
NOTE: It is not necessary to do a functional test of the tachometers after the installation of only one servovalve 15GG or 16GG or 17GG or 18GG.
(3) Make sure that there are no hydraulic leaks at the interface of the normal brake manifold and the servovalve. Subtask 32-42-48-942-051-A
A. Removal of Equipment
(1) Remove the SAFETY BARRIER(S).
(2) Make sure that the work area is clean and clear of tools and other items.
(3) Remove the WARNING NOTICE(S).
(4) Remove the access platform(s).
(5) Remove the ground support and maintenance equipment, the special and standard tools and all other items.
(1) Remove the SAFETY BARRIER(S).
(2) Make sure that the work area is clean and clear of tools and other items.
(3) Remove the WARNING NOTICE(S).
(4) Remove the access platform(s).
(5) Remove the ground support and maintenance equipment, the special and standard tools and all other items.