DOC AIRBUS | AMM A320FRemoval of the Pressure Relief Valve Hose/Tube
TASK 29-13-49-000-006-A
Removal of the Pressure Relief Valve Hose/Tube
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 29-13-49-860-079-A ** ON A/C NOT FOR ALL
Subtask 29-13-49-020-067-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 00:22:36 UTC
Removal of the Pressure Relief Valve Hose/Tube
WARNING:
OBEY THE HYDRAULIC SAFETY PROCEDURES.
WARNING:
DO NOT TOUCH THE HYDRAULIC SYSTEM COMPONENTS FOR A SHORT TIME AFTER THE ENGINE IS SHUTDOWN. THE ENGINE COMPONENTS STAY HOT FOR SOME TIME AND CAN CAUSE INJURY.
CAUTION:
DO NOT LET HYDRAULIC FLUID FALL ON THE ENGINE. UNWANTED HYDRAULIC FLUID MUST BE REMOVED IMMEDIATELY WITH A CLEAN LINT FREE CLOTH. THE FLUID CAN CAUSE DAMAGE TO THE SURFACE PROTECTION AND TO SOME PARTS.
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 2M (6 FT) - ADJUSTABLE |
| No specific | AR | CONTAINER 5 L (1.32 USGAL) |
| No specific | AR | COVER - PROTECTION |
| No specific | AR | SAFETY CLIP - CIRCUIT BREAKER |
| No specific | AR | WARNING NOTICE(S) |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 447AL | |
| FOR [1000EM2] (ENGINE-2) | |
| 447AL | |
| REFERENCE | DESIGNATION |
|---|---|
| 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 71-13-00-010-040-B | Opening of the Fan Cowl Doors |
Pressure Relief Valve Hose/TubeSubtask 29-13-49-860-079-A ** ON A/C NOT FOR ALL
A. Aircraft Maintenance Configuration
(1) Make sure that the Yellow hydraulic system is depressurized and put it in the maintenance configuration.
(Ref. AMM TASK 29-10-00-864-002)
(2) Depressurize the Yellow hydraulic reservoir (Ref. AMM TASK 29-14-00-614-001).
(3) Put WARNING NOTICE(S) in position to tell persons not to pressurize the Yellow hydraulic system:
Subtask 29-13-49-941-073-A ** ON A/C NOT FOR ALL (1) Make sure that the Yellow hydraulic system is depressurized and put it in the maintenance configuration.
(Ref. AMM TASK 29-10-00-864-002)
(2) Depressurize the Yellow hydraulic reservoir (Ref. AMM TASK 29-14-00-614-001).
(3) Put WARNING NOTICE(S) in position to tell persons not to pressurize the Yellow hydraulic system:
- on the ground service panel 198CB.
B. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:
(3) Put WARNING NOTICE(S) in position to tell persons not to pressurize the Yellow hydraulic system:
(6) Put a CONTAINER 5 L (1.32 USGAL) below the higher pressure relief valve hose/tube (25) to collect the remaining fluid.
Subtask 29-13-49-010-068-A ** ON A/C NOT FOR ALL (1) On the center pedestal, on the ENG panel 115VU:
- put WARNING NOTICE(S) to tell persons not to start the engine.
(3) Put WARNING NOTICE(S) in position to tell persons not to pressurize the Yellow hydraulic system:
- in the cockpit, on the HYD section of the overhead panel 40VU.
- make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(6) Put a CONTAINER 5 L (1.32 USGAL) below the higher pressure relief valve hose/tube (25) to collect the remaining fluid.
C. Get Access
(1) Open the left fan-cowl door (Ref. AMM TASK 71-13-00-010-040):
(a) FOR [1000EM2] (ENGINE-2)
open the door 447AL.
(2) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position at the left fan-cowl door 447AL.
Subtask 29-13-49-865-061-A ** ON A/C NOT FOR ALL (1) Open the left fan-cowl door (Ref. AMM TASK 71-13-00-010-040):
(a) FOR [1000EM2] (ENGINE-2)
open the door 447AL.
(2) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position at the left fan-cowl door 447AL.
D. Open, safety and tag this(these) circuit breaker(s):
4. Procedure| PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 121VU | HYDRAULIC/Y HYD/PUMP ENG2/MONG | 3700GD | Q37 |
Subtask 29-13-49-020-067-A ** ON A/C NOT FOR ALL
A. Removal of the Pressure Relief Valve Hose/Tube
(1) Disconnect the higher pressure relief valve hose/tube (25) from the lower pressure relief valve tube (30) and let the fluid flow in the container.
(3) Remove the bolts (5), the washers (10), the nuts (15) and the clamps (20) that attach the pressure relief valve hose/tube (25) to the engine brackets at the flange STA.199(A2).
(4) Remove the pressure relief valve hose/tube (25) from the engine.
(5) Put COVER - PROTECTION on the pressure relief valve tube (30), the fitting on the top case drain hose/tube and the pressure relief valve hose/tube (25).
(6) Put a CONTAINER 5 L (1.32 USGAL) below the lower pressure relief valve tube (30) to collect the remaining fluid.
(7) Disconnect the lower pressure relief valve tube (30) from the top case drain hose/tube and let the fluid flow in the container.
(10) Remove the bolt (5), the washer (10), the nut (15) and the clamp (20) that attach the lower pressure relief valve tube to the engine bracket at flange STA.185(B5).
(11) Remove the lower pressure relief valve tube (30) from the engine.
(12) Put COVER - PROTECTION on the lower pressure relief valve tube (30), the fitting on the top case drain hose/tube and the higher pressure relief valve hose/tube (25).
(1) Disconnect the higher pressure relief valve hose/tube (25) from the lower pressure relief valve tube (30) and let the fluid flow in the container.
NOTE: Use a second wrench to hold the lower pressure relief valve tube when you loosen the coupling nut on the higher pressure relief valve tube.
(2) Disconnect the pressure relief valve hose/tube (25) from the pressure relief valve interface. (3) Remove the bolts (5), the washers (10), the nuts (15) and the clamps (20) that attach the pressure relief valve hose/tube (25) to the engine brackets at the flange STA.199(A2).
(4) Remove the pressure relief valve hose/tube (25) from the engine.
(5) Put COVER - PROTECTION on the pressure relief valve tube (30), the fitting on the top case drain hose/tube and the pressure relief valve hose/tube (25).
(6) Put a CONTAINER 5 L (1.32 USGAL) below the lower pressure relief valve tube (30) to collect the remaining fluid.
(7) Disconnect the lower pressure relief valve tube (30) from the top case drain hose/tube and let the fluid flow in the container.
NOTE: Use a second wrench to hold the fitting on the case drain tube when you loosen the coupling nut on the pressure relief valve tube.
(8) If not done before, disconnect the lower pressure relief valve tube (30) from the upper pressure relief valve hose/tube (25). NOTE: Use a second wrench to hold the lower pressure relief valve tube when you loosen the coupling nut on the higher pressure relief valve tube.
(9) Remove the bolt (5), the washer (10), the nut (15) and the clamp (20) that attach the lower pressure relief valve tube to the engine bracket at the flange STA.199(A2). (10) Remove the bolt (5), the washer (10), the nut (15) and the clamp (20) that attach the lower pressure relief valve tube to the engine bracket at flange STA.185(B5).
(11) Remove the lower pressure relief valve tube (30) from the engine.
(12) Put COVER - PROTECTION on the lower pressure relief valve tube (30), the fitting on the top case drain hose/tube and the higher pressure relief valve hose/tube (25).