DOC AIRBUS | AMM A320FInstallation of the Reservoir Pressure Switch of the Yellow Hydraulic System
TASK 29-34-11-400-003-A
Installation of the Reservoir Pressure Switch 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 29-34-11-860-058-A
Subtask 29-34-11-420-052-A
Subtask 29-34-11-860-053-A
[Rev.10 from 2021]
2026.04.01 00:28:09 UTC
Installation of the Reservoir Pressure Switch 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.
FIN: 3384GH
1. Reason for the JobSelf explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | 2 | WARNING NOTICE(S) |
| No specific | Torque wrench: range to between 1.32 and 1.21 m.daN (116.81 and 107.08 lbf.in )  |
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.02ABA1) | Phosphate Ester Hydraulic Fluid-General Power - - |
| (Material No.03FAB1) | Mineral Oil base Grease-- Vaseline or Petrolatum - |
| (Material No.04QAB2) | Coating_- Flexible Structure |
| (Material No.14CCB6) | Testing Medium-Leak Detection - Oxygen System |
| No specific | lockwire 0.8 mm (0.032 in.). |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 197BB |
| FIG.ITEM | DESIGNATION | IPC-CSN |
|---|---|---|
| 3 | O-RING | AIPC 29-34-03-02-020 |
| 3 | O-RING | AIPC 29-34-83-02-040 |
| 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) |
| 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 29-34-00-710-001-A | Operational Test of Reservoir Low Air Pressure Warning |
Air Pressure SwitchSubtask 29-34-11-860-058-A
A. Aircraft Maintenance Configuration
(2) Make sure that the Yellow hydraulic system is depressurized and put it in the maintenance configuration.
(Ref. AMM TASK 29-00-00-864-001).
(3) Make sure that the reservoir of the Yellow hydraulic system is depressurized.
(Ref. AMM TASK 29-14-00-614-001).
(4) Make sure that the WARNING NOTICE(S) are in position to tell persons not to pressurize the Yellow hydraulic system:
(6) Make sure that the isolation coupling of the Power Transfer Unit (PTU) is disconnected (Ref. AMM TASK 29-23-00-860-001).
Subtask 29-34-11-865-059-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 Yellow hydraulic system is depressurized and put it in the maintenance configuration.
(Ref. AMM TASK 29-00-00-864-001).
(3) Make sure that the reservoir of the Yellow hydraulic system is depressurized.
(Ref. AMM TASK 29-14-00-614-001).
(4) 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.
(6) Make sure that the isolation coupling of the Power Transfer Unit (PTU) is disconnected (Ref. AMM TASK 29-23-00-860-001).
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 ALL | |||
| 121VU | HYDRAULIC/LOW/LVL/IND | 1832GQ | N32 |
| 121VU | HYDRAULIC/HYD/QTY/IND | 1831GQ | P35 |
| 121VU | HYDRAULIC/Y HYD/PUMP ENG2/MONG | 3700GD | Q37 |
| ** 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 29-34-11-420-052-A
A. Installation of the Reservoir Pressure Switch
(1) Clean the component interfaces and the adjacent area.
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Remove the blanking plugs from the pressure switch and the port on the top of the reservoir.
(4) Apply Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) to the new AIPC 29-34-03-02-020 O-RING (3) or AIPC 29-34-83-02-040 O-RING (3).
(5) Install the O-ring (3) on the pressure switch (2).
(6) Install the pressure switch (2) on the reservoir.
(7) TORQUE the pressure switch (2) to between 1.32 and 1.21 m.daN (116.81 and 107.08 lbf.in ).
(8) Safety the pressure switch (2) with lockwire 0.8 mm (0.032 in.).
(9) Make sure that the bonding jumper (5) and the area of the pressure switch (2) which it touches are clean.
(10) Apply Mineral Oil base Grease-- Vaseline or Petrolatum - (Material No.03FAB1) to the parts of the bonding jumper (5) and the pressure switch (2) which touch.
(11) Connect the bonding jumper (5) to the pressure switch (2).
(12) Install the bolt (7), the washer (6) and the nut (4). Tighten the nut (4).
(13) Remove the blanking caps from the electrical connector (1) and the pressure switch (2).
(14) Make sure that all the electrical connections are clean and in the correct condition.
(15) Connect the electrical connector (1) and the pressure switch (2).
(16) Apply Coating_- Flexible Structure (Material No.04QAB2) to the connection of the bonding jumper (5) and the pressure switch (2).
Subtask 29-34-11-790-052-A (1) Clean the component interfaces and the adjacent area.
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Remove the blanking plugs from the pressure switch and the port on the top of the reservoir.
(4) Apply Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) to the new AIPC 29-34-03-02-020 O-RING (3) or AIPC 29-34-83-02-040 O-RING (3).
(5) Install the O-ring (3) on the pressure switch (2).
(6) Install the pressure switch (2) on the reservoir.
(7) TORQUE the pressure switch (2) to between 1.32 and 1.21 m.daN (116.81 and 107.08 lbf.in )
. (8) Safety the pressure switch (2) with lockwire 0.8 mm (0.032 in.).
(9) Make sure that the bonding jumper (5) and the area of the pressure switch (2) which it touches are clean.
(10) Apply Mineral Oil base Grease-- Vaseline or Petrolatum - (Material No.03FAB1) to the parts of the bonding jumper (5) and the pressure switch (2) which touch.
(11) Connect the bonding jumper (5) to the pressure switch (2).
(12) Install the bolt (7), the washer (6) and the nut (4). Tighten the nut (4).
(13) Remove the blanking caps from the electrical connector (1) and the pressure switch (2).
(14) Make sure that all the electrical connections are clean and in the correct condition.
(15) Connect the electrical connector (1) and the pressure switch (2).
(16) Apply Coating_- Flexible Structure (Material No.04QAB2) to the connection of the bonding jumper (5) and the pressure switch (2).
B. Leak Test of the Hydraulic Connections
(1) Pressurize the reservoir of the Yellow hydraulic system (Ref. AMM TASK 29-14-00-614-002).
(2) Apply Testing Medium-Leak Detection - Oxygen System (Material No.14CCB6) to the connection of the pressure switch (2) and the reservoir and make sure that there are no leaks.
Subtask 29-34-11-865-060-A (1) Pressurize the reservoir of the Yellow hydraulic system (Ref. AMM TASK 29-14-00-614-002).
(2) Apply Testing Medium-Leak Detection - Oxygen System (Material No.14CCB6) to the connection of the pressure switch (2) and the reservoir and make sure that there are no leaks.
C. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
Subtask 29-34-11-710-052-A 5. Close-up| PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 121VU | HYDRAULIC/HYD POWER/Y | 3803GX | N30 |
| ** ON A/C ALL | |||
| 121VU | HYDRAULIC/LOW/LVL/IND | 1832GQ | N32 |
| 121VU | HYDRAULIC/HYD/QTY/IND | 1831GQ | P35 |
| 121VU | HYDRAULIC/Y HYD/PUMP ENG2/MONG | 3700GD | Q37 |
| ** 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 29-34-11-860-053-A
A. Put the aircraft back to the serviceable condition.
(1) Connect the isolation coupling of the power transfer unit (PTU) (Ref. AMM TASK 29-23-00-860-002).
(2) Make sure that the work area is clean and clear of tools and other items.
(3) Close the access door 197BB.
(4) Remove the warning notices from the cockpit and the ground service panel of the Yellow hydraulic system.
Subtask 29-34-11-865-061-A (1) Connect the isolation coupling of the power transfer unit (PTU) (Ref. AMM TASK 29-23-00-860-002).
(2) Make sure that the work area is clean and clear of tools and other items.
(3) Close the access door 197BB.
(4) Remove the warning notices from the cockpit and the ground service panel of the Yellow hydraulic system.
B. Make sure that this(these) circuit breaker(s) is(are) closed:
| PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 121VU | HYDRAULIC/HYD POWER/Y | 3803GX | N30 |
| ** ON A/C ALL | |||
| 121VU | HYDRAULIC/LOW/LVL/IND | 1832GQ | N32 |
| 121VU | HYDRAULIC/HYD/QTY/IND | 1831GQ | P35 |
| 121VU | HYDRAULIC/Y HYD/PUMP ENG2/MONG | 3700GD | Q37 |
| ** 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 |