DOC AIRBUS | AMM A320FInstallation of the Thrust Reverser Hydraulic Isolation Valve [IAE]
TASK 78-37-51-400-010-A
Installation of the Thrust Reverser Hydraulic Isolation Valve
1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
C. Work Zones and Access Panels
D. Referenced Information
3. Job Set-up
Subtask 78-37-51-860-052-A ** ON A/C NOT FOR ALL
Subtask 78-37-51-420-052-A ** ON A/C NOT FOR ALL
Subtask 78-37-51-865-059-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 03:30:08 UTC
Installation of the Thrust Reverser Hydraulic Isolation Valve
1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
| REFERENCE | DESIGNATION |
|---|---|
| No specific | corrosion resistant steel lockwire 0.8 mm DIA. |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| FOR [1000EM1] (ENGINE-1) | |
| 437AL, 438AR | |
| FOR [1000EM2] (ENGINE-2) | |
| 447AL, 448AR | |
| REFERENCE | DESIGNATION |
|---|---|
| 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 71-13-00-010-010-A | Opening of the Fan Cowls 437AL(447AL),438AR(448AR) |
| TASK 71-13-00-410-010-A | Closing of the Fan Cowls 437AL(447AL),438AR(448AR) |
| TASK 78-31-00-710-041-A | Operational Test of the Thrust Reverser System with the CFDS |
| TASK 78-31-00-710-041-A-02 | Operational test of the Thrust Reverser without the CFDS and Engine Running |
Thrust Reverser Hydraulic Isolation ValveSubtask 78-37-51-860-052-A ** ON A/C NOT FOR ALL
A. Aircraft Maintenance Configuration
(1) On the center pedestal, on the ENG panel 115VU, make sure that a WARNING NOTICE(S) is in position to tell persons not to start the engine.
(2) On the overhead maintenance panel 50VU, make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off. Make sure that a WARNING NOTICE(S) is in position to tell persons not to energize the FADEC 1(2).
(3) Make sure that the ACCESS PLATFORM 1M(3 FT) is in position.
Subtask 78-37-51-010-055-A ** ON A/C NOT FOR ALL (1) On the center pedestal, on the ENG panel 115VU, make sure that a WARNING NOTICE(S) is in position to tell persons not to start the engine.
(2) On the overhead maintenance panel 50VU, make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off. Make sure that a WARNING NOTICE(S) is in position to tell persons not to energize the FADEC 1(2).
(3) Make sure that the ACCESS PLATFORM 1M(3 FT) is in position.
B. Make sure that the fan cowl doors are open (Ref. AMM TASK 71-13-00-010-010):
(1) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(2) FOR [1000EM2] (ENGINE-2)
447AL 448AR
Subtask 78-37-51-865-058-A ** ON A/C NOT FOR ALL (1) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(2) FOR [1000EM2] (ENGINE-2)
447AL 448AR
C. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:
Subtask 78-37-51-614-057-A ** ON A/C NOT FOR ALL | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| FOR FIN: 1000EM1 (ENGINE1) | |||
| 121VU | ENG1/REV/LOCK | 1EG1 | N44 |
| FOR FIN: 1000EM2 (ENGINE2) | |||
| 121VU | ENG2/REV/LOCK | 1EG2 | N45 |
D. Make sure that the hydraulic reservoirs are depressurized
(1) For engine 1 depressurize the green hydraulic reservoir (Ref. AMM TASK 29-14-00-614-001).
(2) For engine 2 depressurize the yellow hydraulic reservoir (Ref. AMM TASK 29-14-00-614-001).
4. Procedure(1) For engine 1 depressurize the green hydraulic reservoir (Ref. AMM TASK 29-14-00-614-001).
(2) For engine 2 depressurize the yellow hydraulic reservoir (Ref. AMM TASK 29-14-00-614-001).
Subtask 78-37-51-420-052-A ** ON A/C NOT FOR ALL
A. Installation of the Thrust Reverser Hydraulic Isolation Valve
(1) Put a CLOTH - PROTECTIVE in the location where you will install the thrust reverser isolation valve.
The hydraulic fluid will cause damage to the engine.
(2) Put the thermal isolation (30) between the spacers (35) and (40) in position on the support plate (15).
(4) Remove the blanking plugs from the ports of the isolation valve and filter.
(5) Remove the PLUG-BLANKING from each disconnected line end.
(6) Install and connect the pressure supply tube (85) between the filter (25) and the isolation valve (50).
(7) TORQUE the four bolts (10) to between 0.79 and 0.56 m.daN (69.91 and 49.56 lbf.in )
.
(8) Safety the bolts (10):
(9) TORQUE the coupling nuts of the tube (85) to between 3.2 and 2.9 m.daN (23.60 and 21.39 lbf.ft ).
(10) Install the assembly support plate (15) with the isolation valve (50) in position below the pylon with the bolts (90) and washers (95). Do not tighten the bolts.
(11) Remove the PLUG-BLANKING from each disconnected line end.
(12) Connect the pressure supply tube (20), the control tube (60) and the return tube (55).
(13) TORQUE the coupling nuts of the pressure supply tube (20) and control tube (60) to between 3.2 and 2.9 m.daN (23.60 and 21.39 lbf.ft ).
(14) TORQUE the coupling nut of the return tube (55) to between 1.7 and 1.5 m.daN (12.54 and 11.06 lbf.ft ).
(15) TORQUE the bolts (90) to between 0.79 and 0.56 m.daN (69.91 and 49.56 lbf.in ).
(16) Install the clamp (75) with the bolt (65), the washer (70) and nut (80) to attach the control tube (60) and the return tube (55).
(17) Remove the CAP-BLANKING from each electrical connector and receptacle.
(18) Make sure that all the electrical connections are clean and in the correct condition.
(19) Connect the electrical connector (45) to the isolation valve (50).
(20) Remove the protective cloth from the engine.
5. Close-up(1) Put a CLOTH - PROTECTIVE in the location where you will install the thrust reverser isolation valve.
The hydraulic fluid will cause damage to the engine.
(2) Put the thermal isolation (30) between the spacers (35) and (40) in position on the support plate (15).
NOTE: You must install the shortest spacer (40) on isolation valve side.
(3) Put the isolation valve (50) in position on the support plate (15) with the four bolts (10), the washers (12) and the spacers (100). Do not tighten the bolts. (4) Remove the blanking plugs from the ports of the isolation valve and filter.
(5) Remove the PLUG-BLANKING from each disconnected line end.
(6) Install and connect the pressure supply tube (85) between the filter (25) and the isolation valve (50).
(7) TORQUE the four bolts (10) to between 0.79 and 0.56 m.daN (69.91 and 49.56 lbf.in )
. (8) Safety the bolts (10):
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.
(a) Safety the bolts (10) with corrosion resistant steel lockwire 0.8 mm DIA.(9) TORQUE the coupling nuts of the tube (85) to between 3.2 and 2.9 m.daN (23.60 and 21.39 lbf.ft )
. (10) Install the assembly support plate (15) with the isolation valve (50) in position below the pylon with the bolts (90) and washers (95). Do not tighten the bolts.
(11) Remove the PLUG-BLANKING from each disconnected line end.
(12) Connect the pressure supply tube (20), the control tube (60) and the return tube (55).
(13) TORQUE the coupling nuts of the pressure supply tube (20) and control tube (60) to between 3.2 and 2.9 m.daN (23.60 and 21.39 lbf.ft )
. (14) TORQUE the coupling nut of the return tube (55) to between 1.7 and 1.5 m.daN (12.54 and 11.06 lbf.ft )
. (15) TORQUE the bolts (90) to between 0.79 and 0.56 m.daN (69.91 and 49.56 lbf.in )
. (16) Install the clamp (75) with the bolt (65), the washer (70) and nut (80) to attach the control tube (60) and the return tube (55).
(17) Remove the CAP-BLANKING from each electrical connector and receptacle.
(18) Make sure that all the electrical connections are clean and in the correct condition.
(19) Connect the electrical connector (45) to the isolation valve (50).
(20) Remove the protective cloth from the engine.
Subtask 78-37-51-865-059-A ** ON A/C NOT FOR ALL
A. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
Subtask 78-37-51-614-058-A ** ON A/C NOT FOR ALL | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| FOR FIN: 1000EM1 (ENGINE1) | |||
| 121VU | ENG1/REV/LOCK | 1EG1 | N44 |
| FOR FIN: 1000EM2 (ENGINE2) | |||
| 121VU | ENG2/REV/LOCK | 1EG2 | N45 |
B. Pressurization of the hydraulic reservoir
(1) For engine 1 pressurize the green hydraulic reservoir (Ref. AMM TASK 29-14-00-614-002).
(2) For engine 2 pressurize the yellow hydraulic reservoir (Ref. AMM TASK 29-14-00-614-002).
(3) Make sure that there is no leaks at the tube connections.
Subtask 78-37-51-710-052-A ** ON A/C NOT FOR ALL (1) For engine 1 pressurize the green hydraulic reservoir (Ref. AMM TASK 29-14-00-614-002).
(2) For engine 2 pressurize the yellow hydraulic reservoir (Ref. AMM TASK 29-14-00-614-002).
(3) Make sure that there is no leaks at the tube connections.
C. Test and bleed procedure.
(1) Operate the thrust reverser for ten deploy-to-stow cycles (Ref. AMM TASK 78-31-00-710-041) and check on CFDS that no messages related to the isolation valve is present.
(2) Make sure that there is no leaks at the tube connections.
Subtask 78-37-51-410-052-A ** ON A/C NOT FOR ALL (1) Operate the thrust reverser for ten deploy-to-stow cycles (Ref. AMM TASK 78-31-00-710-041) and check on CFDS that no messages related to the isolation valve is present.
(2) Make sure that there is no leaks at the tube connections.
D. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-010):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(3) Remove the access platform(s).
(4) Remove the WARNING NOTICE(S).
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-010):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(3) Remove the access platform(s).
(4) Remove the WARNING NOTICE(S).