DOC AIRBUS | AMM A320FInstallation of the Low Level Switch of the Blue Hydraulic System
TASK 29-12-41-400-003-A
Installation of the Low Level Switch of the Blue 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 29-12-41-860-058-A
Subtask 29-12-41-420-052-A
Subtask 29-12-41-860-059-A
[Rev.10 from 2021]
2026.04.01 00:19:25 UTC
Installation of the Low Level Switch of the Blue 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.
1. Reason for the JobSelf explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | 1 | ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE |
| No specific | 1 | CONTAINER 5 L (1.32 USGAL) |
| No specific | 2 | WARNING NOTICE(S) |
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.02ABA1) | Phosphate Ester Hydraulic Fluid-General Power - - |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 197FB |
| FIG.ITEM | DESIGNATION | IPC-CSN |
|---|---|---|
| 7 | O-RING | AIPC 29-12-41-01-040 |
| 7 | PACKING | AIPC 29-12-41-01-045 |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 12-12-29-611-001-A | Fill the Hydraulic Fluid Reservoir with a Hand Pump |
| TASK 12-12-29-611-002-A | Fill the Hydraulic Fluid Reservoir with a Hydraulic Service Cart |
| 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 29-00-00-864-001-A | Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action |
| TASK 29-00-00-870-008-A | Bleeding Procedure of the Blue Hydraulic System Upstream of the Blue E-Pump |
| TASK 29-00-00-870-009-A | Bleeding Procedure of the Blue Hydraulic System Downstream of the Blue E-Pump |
| TASK 29-00-00-910-002-A | Safety Procedures of the Hydraulic System |
| TASK 29-10-00-863-003-A | Pressurize the Blue Hydraulic System with a Hydraulic Ground Power-Cart |
| TASK 29-10-00-863-003-A-01 | Pressurize the Blue Hydraulic System with the Blue Electric Pump |
| TASK 29-10-00-864-003-A | Depressurize the Blue Hydraulic System |
| TASK 29-14-00-614-001-A | Depressurization of the Hydraulic Reservoirs |
| TASK 29-31-00-710-001-A | Functional Check of Reservoir Low Level Warning |
| TASK 31-60-00-860-002-A | EIS Stop Procedure |
Quantity Indicator and Low Level SwitchSubtask 29-12-41-860-058-A
A. Aircraft Maintenance Configuration
(2) Make sure that the Blue 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 Blue hydraulic system is depressurized.
(Ref. AMM TASK 29-14-00-614-001).
(4) Make sure that the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE is in position at the access door 197FB.
(5) Make sure that the access door 197FB is open.
(6) Make sure that the CONTAINER 5 L (1.32 USGAL) is in position below the reservoir.
(7) Make sure that the WARNING NOTICE(S) are in position to tell persons not to pressurize the Blue hydraulic system:
Subtask 29-12-41-865-058-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 Blue 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 Blue hydraulic system is depressurized.
(Ref. AMM TASK 29-14-00-614-001).
(4) Make sure that the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE is in position at the access door 197FB.
(5) Make sure that the access door 197FB is open.
(6) Make sure that the CONTAINER 5 L (1.32 USGAL) is in position below the reservoir.
(7) Make sure that the WARNING NOTICE(S) are in position to tell persons not to pressurize the Blue hydraulic system:
- in the cockpit on the hydraulic section 40VU of the overhead panel,
- on the ground service panel of the Blue hydraulic system.
B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:
4. Procedure| PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C ALL | |||
| 49VU | HYD/HYD PWR/B WARN/& CTL | 2702GJ | C12 |
| 121VU | HYDRAULIC/LOW/LVL/IND | 1832GQ | N32 |
| 123VU | B HYD/ELEC PUMP | 2701GJ | AB09 |
Subtask 29-12-41-420-052-A
A. Installation of the Low Level 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 plug from the reservoir (1).
(4) Lubricate the new AIPC 29-12-41-01-040 O-RING (7) or the new O-ring AIPC 29-12-41-01-045 PACKING (7) with Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) .
(5) Put the O-ring (7) in position on the low level switch (8).
(6) Put the low level switch (8) in position in the reservoir (1).
(7) Install the bolts (10) and the washers (9).
(8) Remove the blanking caps from the electrical connector (11) and from the receptacle.
(9) Make sure that all the electrical connections are clean and in the correct condition.
(10) Connect the electrical connector (11).
Subtask 29-12-41-865-059-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 plug from the reservoir (1).
(4) Lubricate the new AIPC 29-12-41-01-040 O-RING (7) or the new O-ring AIPC 29-12-41-01-045 PACKING (7) with Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) .
(5) Put the O-ring (7) in position on the low level switch (8).
(6) Put the low level switch (8) in position in the reservoir (1).
(7) Install the bolts (10) and the washers (9).
(8) Remove the blanking caps from the electrical connector (11) and from the receptacle.
(9) Make sure that all the electrical connections are clean and in the correct condition.
(10) Connect the electrical connector (11).
B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
Subtask 29-12-41-865-061-A | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C ALL | |||
| 49VU | HYD/HYD PWR/B WARN/& CTL | 2702GJ | C12 |
| 121VU | HYDRAULIC/LOW/LVL/IND | 1832GQ | N32 |
| 123VU | B HYD/ELEC PUMP | 2701GJ | AB09 |
C. Make sure that this(these) circuit breaker(s) is(are) closed:
Subtask 29-12-41-710-051-A | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C ALL | |||
| 121VU | HYDRAULIC/HYD/QTY/IND | 1831GQ | P35 |
D. Test
(1) Do the operational test of the fluid low-level warning system (Ref. AMM TASK 29-31-00-710-001).
Subtask 29-12-41-790-051-A (1) Do the operational test of the fluid low-level warning system (Ref. AMM TASK 29-31-00-710-001).
NOTE: Do only the steps of the test applicable for the Blue hydraulic system.
E. Leak Test of the Hydraulic Connections
(1) Examine the connection of the low level switch (8) and the reservoir (1).
(2) Make sure that there are no leaks.
Subtask 29-12-41-870-051-B (1) Examine the connection of the low level switch (8) and the reservoir (1).
(2) Make sure that there are no leaks.
F. Bleeding Procedure
(1) Pressurize the Blue hydraulic system (Ref. AMM TASK 29-10-00-863-003).
(2) Keep the system pressurized for 5 minutes to bleed the Blue hydraulic system.
(3) Do the bleeding procedure of the blue hydraulic system (Ref. AMM TASK 29-00-00-870-008) and (Ref. AMM TASK 29-00-00-870-009).
(4) Depressurize the Blue hydraulic system (Ref. AMM TASK 29-10-00-864-003).
5. Close-up(1) Pressurize the Blue hydraulic system (Ref. AMM TASK 29-10-00-863-003).
(2) Keep the system pressurized for 5 minutes to bleed the Blue hydraulic system.
(3) Do the bleeding procedure of the blue hydraulic system (Ref. AMM TASK 29-00-00-870-008) and (Ref. AMM TASK 29-00-00-870-009).
(4) Depressurize the Blue hydraulic system (Ref. AMM TASK 29-10-00-864-003).
Subtask 29-12-41-860-059-A
A. Put the aircraft back to the serviceable condition.
(1) Make sure that the level of fluid in the reservoir of the Blue hydraulic system is correct. Add fluid as necessary (Ref. AMM TASK 12-12-29-611-001) or (Ref. AMM TASK 12-12-29-611-002).
(2) Do the EIS stop procedure
(Ref. AMM TASK 31-60-00-860-002).
(3) De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).
(4) Remove the container.
(5) Remove the access platform(s).
(6) Remove the WARNING NOTICE(S).
Subtask 29-12-41-410-052-A (1) Make sure that the level of fluid in the reservoir of the Blue hydraulic system is correct. Add fluid as necessary (Ref. AMM TASK 12-12-29-611-001) or (Ref. AMM TASK 12-12-29-611-002).
(2) Do the EIS stop procedure
(Ref. AMM TASK 31-60-00-860-002).
(3) De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).
(4) Remove the container.
(5) Remove the access platform(s).
(6) Remove the WARNING NOTICE(S).
B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the access door 197FB.
Subtask 29-12-41-865-060-A (1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the access door 197FB.
C. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
| PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C ALL | |||
| 121VU | HYDRAULIC/HYD/QTY/IND | 1831GQ | P35 |