DOC AIRBUS | AMM A320FInstallation of the Check Valve Restrictor Tubes (for Engine 2)
TASK 29-13-49-400-007-A
Installation of the Check Valve Restrictor Tubes (for Engine 2)
This task is effective post SB RA32178-1
This task is for the installation of the check valve restrictor tubes for engine 2 1000EM2. For the installation of the check valve restrictor tubes for engine 1 1000EM1 (Ref.Task 29-11-49-000-00700).
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 29-13-49-860-082-A ** ON A/C NOT FOR ALL
Subtask 29-13-49-420-070-A ** ON A/C NOT FOR ALL
Subtask 29-13-49-860-083-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 00:22:39 UTC
Installation of the Check Valve Restrictor Tubes (for Engine 2)
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 JobThis task is effective post SB RA32178-1
This task is for the installation of the check valve restrictor tubes for engine 2 1000EM2. For the installation of the check valve restrictor tubes for engine 1 1000EM1 (Ref.Task 29-11-49-000-00700).
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Work Zones and Access Panels
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 195BB, 447AL, 448AR |
| 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 29-10-00-864-002-A | Depressurize the Yellow Hydraulic System |
| TASK 29-13-00-710-002-A | Operational Test of 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 71-13-00-010-040-B | Opening of the Fan Cowl Doors |
| TASK 71-13-00-410-040-B | Closing of the Fan Cowl Doors |
Check Valve Restrictor TubesSubtask 29-13-49-860-082-A ** ON A/C NOT FOR ALL
A. Aircraft Maintenance Configuration
(1) Make sure that the Yellow hydraulic system is depressurized (Ref. AMM TASK 29-10-00-864-002).
(2) Make sure that the Yellow hydraulic reservoir is depressurized (Ref. AMM TASK 29-14-00-614-001).
(3) Make sure that the WARNING NOTICE(S) is (are) in position to tell persons not to pressurize the Yellow hydraulic system:
Subtask 29-13-49-941-082-A ** ON A/C NOT FOR ALL (1) Make sure that the Yellow hydraulic system is depressurized (Ref. AMM TASK 29-10-00-864-002).
(2) Make sure that the Yellow hydraulic reservoir is depressurized (Ref. AMM TASK 29-14-00-614-001).
(3) Make sure that the WARNING NOTICE(S) is (are) 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) Make sure that the WARNING NOTICE(S) is (are) in position to tell persons not to pressurize the Yellow hydraulic system:
Subtask 29-13-49-865-064-A ** ON A/C NOT FOR ALL (1) On the center pedestal, on the ENG panel 115VU:
- make sure that the WARNING NOTICE(S) is (are) in position to tell persons not to start the engine 2.
(3) Make sure that the WARNING NOTICE(S) is (are) 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/2 pushbutton switch is off.
C. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:
Subtask 29-13-49-010-070-A ** ON A/C NOT FOR ALL | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 121VU | HYDRAULIC/Y HYD/PUMP ENG2/MONG | 3700GD | Q37 |
D. Get Access
(1) Make sure that the fan-cowl doors are open:
- 447AL 448AR (Ref. AMM TASK 71-13-00-010-040).
(2) Make sure that the access door 195BB is open.
(3) Make sure that the ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE is in position at the engine.
4. Procedure(1) Make sure that the fan-cowl doors are open:
- 447AL 448AR (Ref. AMM TASK 71-13-00-010-040).
(2) Make sure that the access door 195BB is open.
(3) Make sure that the ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE is in position at the engine.
Subtask 29-13-49-420-070-A ** ON A/C NOT FOR ALL
A. Installation of the Check Valve Restrictor Tubes
(1) Connect the tube (30) to the HCU. Do not torque the coupling nut at this time.
(2) Put the clamps (10) on the tube (30). Install the bolts (5), washers (20) and nuts (25) that attach the clamps to the engine brackets at the flange STA199 (A2). (3 locations). Do not torque the nuts at this time.
(3) Connect the tube (30) to the tube (15). Do not torque the coupling nut at this time.
(4) Put the clamp (10) on the tube (15). Install the bolt (5), washer (20) and nut (25) that attach the clamp to the engine bracket at the flange STA199 (A2). Do not torque the nuts at this time.
(5) Put the clamp (10) on the tube (15). Install the bolt (5), washer (20) and nut (25) that attach the clamp to the engine bracket at the flange STA185 (B5). Do not torque the nuts at this time.
(6) Connect the tube (15) to the tee fitting on the upper case drain tube. Do not torque the coupling nut at this time.
(7) Make sure that the tubes (15) and (30) are correctly aligned with each other, the HCU and the tee fitting on the upper case drain tube.
(8) TORQUE the coupling nut on the tube (15) to between 145 and 135 lbf.in (1.64 and 1.53 m.daN )
.
.
.
Subtask 29-13-49-865-114-A ** ON A/C NOT FOR ALL (1) Connect the tube (30) to the HCU. Do not torque the coupling nut at this time.
(2) Put the clamps (10) on the tube (30). Install the bolts (5), washers (20) and nuts (25) that attach the clamps to the engine brackets at the flange STA199 (A2). (3 locations). Do not torque the nuts at this time.
(3) Connect the tube (30) to the tube (15). Do not torque the coupling nut at this time.
(4) Put the clamp (10) on the tube (15). Install the bolt (5), washer (20) and nut (25) that attach the clamp to the engine bracket at the flange STA199 (A2). Do not torque the nuts at this time.
(5) Put the clamp (10) on the tube (15). Install the bolt (5), washer (20) and nut (25) that attach the clamp to the engine bracket at the flange STA185 (B5). Do not torque the nuts at this time.
(6) Connect the tube (15) to the tee fitting on the upper case drain tube. Do not torque the coupling nut at this time.
(7) Make sure that the tubes (15) and (30) are correctly aligned with each other, the HCU and the tee fitting on the upper case drain tube.
(8) TORQUE the coupling nut on the tube (15) to between 145 and 135 lbf.in (1.64 and 1.53 m.daN )
. NOTE: Use a second wrench to hold the tee fitting when you torque the tube coupling nut.
(9) TORQUE the coupling nuts on the two ends of the tube (30) to between 100 and 85 lbf.in (1.13 and 0.96 m.daN ) . NOTE: Use a second wrench to hold the tube (15) and the fitting on the HCU when you torque the tube coupling nut.
(10) TORQUE the nut (25) to between 25 and 20 lbf.in (0.28 and 0.23 m.daN ) . B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
Subtask 29-13-49-710-090-A ** ON A/C NOT FOR ALL | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 121VU | HYDRAULIC/Y HYD/PUMP ENG2/MONG | 3700GD | Q37 |
C. Operational Test
(1) Pressurize the Yellow hydraulic reservoir (Ref. AMM TASK 29-14-00-614-002).
(2) Do an operational test of the Yellow hydraulic system (Ref. AMM TASK 29-13-00-710-002).
(3) During the dry motoring of engine 2, make sure that there are no leaks from the check valve restrictor tubes.
(4) Make sure that the level of the hydraulic fluid in the Yellow reservoir is correct. If necessary, fill the reservoir (Ref. AMM TASK 12-12-29-611-001) or (Ref. AMM TASK 12-12-29-611-002).
5. Close-up(1) Pressurize the Yellow hydraulic reservoir (Ref. AMM TASK 29-14-00-614-002).
(2) Do an operational test of the Yellow hydraulic system (Ref. AMM TASK 29-13-00-710-002).
(3) During the dry motoring of engine 2, make sure that there are no leaks from the check valve restrictor tubes.
(4) Make sure that the level of the hydraulic fluid in the Yellow reservoir is correct. If necessary, fill the reservoir (Ref. AMM TASK 12-12-29-611-001) or (Ref. AMM TASK 12-12-29-611-002).
Subtask 29-13-49-860-083-A ** ON A/C NOT FOR ALL
A. Aircraft Maintenance Configuration
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the access platform(s).
Subtask 29-13-49-410-069-A ** ON A/C NOT FOR ALL (1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the access platform(s).
B. Close Access
(1) Close the fan-cowl doors:
- 447AL 448AR (Ref. AMM TASK 71-13-00-410-040).
(2) Close the door 195BB.
Subtask 29-13-49-942-066-A ** ON A/C NOT FOR ALL (1) Close the fan-cowl doors:
- 447AL 448AR (Ref. AMM TASK 71-13-00-410-040).
(2) Close the door 195BB.
C. Safety Precautions
(1) Remove the WARNING NOTICE(S).
(1) Remove the WARNING NOTICE(S).