DOC AIRBUS | AMM A320FInstallation of the Reservoir Depressurization Valve of the Yellow Hydraulic System
TASK 29-14-16-400-003-A
Installation of the Reservoir Depressurization Valve of the Yellow Hydraulic System
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
C. Work Zones and Access Panels
D. Expendable Parts
E. Referenced Information
3. Job Set-up
Subtask 29-14-16-860-055-A
Subtask 29-14-16-420-052-A
Subtask 29-14-16-942-052-A
[Rev.10 from 2021]
2026.04.01 00:24:38 UTC
Installation of the Reservoir Depressurization Valve of the Yellow Hydraulic System
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.
FIN: 3087GM
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.04QAB2) | Coating_- Flexible Structure |
| (Material No.06AEB2) | Polysulfide Sealant-Low Adhesion Fillet Structure |
| (Material No.06LCG9) | Non Hardening Jointing Putty-Medium Temp. Area - - |
| (Material No.14CCB6) | Testing Medium-Leak Detection - Oxygen System |
| No specific | lockwire, corrosion resistant steel 1.2 mm (0.047 in.) |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 198CB, 198DB |
| FIG.ITEM | DESIGNATION | IPC-CSN |
|---|---|---|
| 3 | O-RING | AIPC 29-14-04-04-030 |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 29-00-00-864-001-A | Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action |
| TASK 29-00-00-910-002-A | Safety Procedures of the 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) |
Depressurization ValveSubtask 29-14-16-860-055-A
A. Aircraft Maintenance Configuration
(2) Make sure that the WARNING NOTICE(S) are in position to tell persons not to pressurize the Yellow hydraulic system:
(Ref. AMM TASK 29-00-00-864-001).
(4) Make sure that the reservoir of the Yellow hydraulic system is depressurized (Ref. AMM TASK 29-14-00-614-001).
(5) Make sure that the access panels 198CB and 198DB are removed.
Subtask 29-14-16-865-055-A WARNING:
OBEY THE HYDRAULIC SAFETY PROCEDURES.
(1) Obey the hydraulic safety procedures (Ref. AMM TASK 29-00-00-910-002). (2) Make sure that the WARNING NOTICE(S) are in position to tell persons not to pressurize the Yellow hydraulic system:
- in the cockpit on the hydraulic section 40VU of the overhead panel,
- on the ground service panel of the Yellow hydraulic system.
(Ref. AMM TASK 29-00-00-864-001).
(4) Make sure that the reservoir of the Yellow hydraulic system is depressurized (Ref. AMM TASK 29-14-00-614-001).
(5) Make sure that the access panels 198CB and 198DB are removed.
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 | HYDRAULIC/HYD POWER/Y | 3803GX | N30 |
| ** ON A/C NOT FOR ALL | |||
| 121VU | HYDRAULIC/HYD POWER/Y | 3803GX | N31 |
| ** ON A/C ALL | |||
| 123VU | Y HYD/ELEC/PUMP | 3802GX | AB06 |
| 123VU | Y HYD/ELEC/ELEC PUMP/NORM | 3801GX | AB03 |
Subtask 29-14-16-420-052-A
A. Installation of the Reservoir Depressurization Valve
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Make sure that the contact surface of the depressurization valve (4) and the ground service panel is clean.
(4) Apply Polysulfide Sealant-Low Adhesion Fillet Structure (Material No.06AEB2) to the contact surface of the depressurization valve (4).
(5) Apply Non Hardening Jointing Putty-Medium Temp. Area - - (Material No.06LCG9) to the bolts (5).
(6) Install the depressurization valve (4) in the ground service panel.
(7) Install the bolts (5) and the nuts (6) and tighten them.
(8) Install the removed parts on the depressurization valve as follows:
(a) Remove the blanking plugs from the depressurization valve (4) and the reducer (2).
(b) Lubricate the threads of the reducer (2) and the AIPC 29-14-04-04-030 O-RING (3) with Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) .
(c) Put the new O-ring (3) in position on the reducer (2).
(d) Install the reducer (2).
(e) TORQUE the reducer (2) to between 3.50 and 3.20 m.daN (25.81 and 23.60 lbf.ft )
.
(9) Apply Coating_- Flexible Structure (Material No.04QAB2) to the sealant around the depressurization valve (4).
(10) Remove the blanking plugs the from the line ends.
(11) Make sure that the hydraulic line end-fittings are serviceable.
(12) Apply Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) to the thread of the line end-fitting.
(13) Connect the line end-fitting (1) to the reducer (2).
(14) TORQUE the line end-fitting (1) to between 1.7 and 1.5 m.daN (12.54 and 11.06 lbf.ft ).
Subtask 29-14-16-790-052-A CAUTION:
USE A SECOND WRENCH TO APPLY COUNTERTORQUE TO THE UNION WHEN YOU DISCONNECT/CONNECT HYDRAULIC LINES ON UNIONS. IF YOU DO NOT USE THE SECOND WRENCH, THERE IS A RISK THAT YOU WILL LOOSEN OR TIGHTEN THE UNION TOO MUCH.
CAUTION:
YOU MUST INSTALL HYDRAULIC TUBES WITH HYDRAULIC FLUID AS LUBRICANT.
(1) Clean the component interfaces and the adjacent area.(2) Do an inspection of the component interfaces and the adjacent area.
(3) Make sure that the contact surface of the depressurization valve (4) and the ground service panel is clean.
(4) Apply Polysulfide Sealant-Low Adhesion Fillet Structure (Material No.06AEB2) to the contact surface of the depressurization valve (4).
(5) Apply Non Hardening Jointing Putty-Medium Temp. Area - - (Material No.06LCG9) to the bolts (5).
(6) Install the depressurization valve (4) in the ground service panel.
(7) Install the bolts (5) and the nuts (6) and tighten them.
(8) Install the removed parts on the depressurization valve as follows:
(a) Remove the blanking plugs from the depressurization valve (4) and the reducer (2).
(b) Lubricate the threads of the reducer (2) and the AIPC 29-14-04-04-030 O-RING (3) with Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) .
(c) Put the new O-ring (3) in position on the reducer (2).
(d) Install the reducer (2).
(e) TORQUE the reducer (2) to between 3.50 and 3.20 m.daN (25.81 and 23.60 lbf.ft )
. (9) Apply Coating_- Flexible Structure (Material No.04QAB2) to the sealant around the depressurization valve (4).
(10) Remove the blanking plugs the from the line ends.
(11) Make sure that the hydraulic line end-fittings are serviceable.
(12) Apply Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) to the thread of the line end-fitting.
(13) Connect the line end-fitting (1) to the reducer (2).
(14) TORQUE the line end-fitting (1) to between 1.7 and 1.5 m.daN (12.54 and 11.06 lbf.ft )
. WARNING:
USE PROTECTIVE GOGGLES AND GLOVES WHEN YOU REMOVE OR INSTALL LOCKWIRE. EACH TIME YOU CUT LOCKWIRE, REMOVE AND DISCARD IT IMMEDIATELY. LOOSE LOCKWIRE CAN CUT YOU OR MAKE YOU BLIND, AND/OR CAN CAUSE DAMAGE.
(15) Safety the cap assembly of the depressurization valve with lockwire, corrosion resistant steel 1.2 mm (0.047 in.). B. Test
(1) Make sure that the depressurization valve (4) is closed.
(2) Pressurize the reservoir of the Yellow hydraulic system (Ref. AMM TASK 29-14-00-614-002).
(3) Apply Testing Medium-Leak Detection - Oxygen System (Material No.14CCB6) to the connection of the pipe end-fitting (1) and the reducer (2) and make sure that there are no leaks.
5. Close-up(1) Make sure that the depressurization valve (4) is closed.
(2) Pressurize the reservoir of the Yellow hydraulic system (Ref. AMM TASK 29-14-00-614-002).
(3) Apply Testing Medium-Leak Detection - Oxygen System (Material No.14CCB6) to the connection of the pipe end-fitting (1) and the reducer (2) and make sure that there are no leaks.
Subtask 29-14-16-942-052-A
A. Remove the warning notices from the cockpit and from the ground service panel.
Subtask 29-14-16-410-052-A B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the access door 198CB.
(3) Install the access panel 198DB.
Subtask 29-14-16-865-058-A (1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the access door 198CB.
(3) Install the access panel 198DB.
C. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
| PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 121VU | HYDRAULIC/HYD POWER/Y | 3803GX | N30 |
| ** ON A/C NOT FOR ALL | |||
| 121VU | HYDRAULIC/HYD POWER/Y | 3803GX | N31 |
| ** ON A/C ALL | |||
| 123VU | Y HYD/ELEC/PUMP | 3802GX | AB06 |
| 123VU | Y HYD/ELEC/ELEC PUMP/NORM | 3801GX | AB03 |