Installation of the Thrust Reverser Hydraulic Valve Filter [IAE]

TASK 78-37-51-400-012-A
Installation of the Thrust Reverser Hydraulic Valve Filter

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 1M(3 FT)
No specific	1	EXTRACTION TOOL - SEAL
No specific	1	WARNING NOTICE(S)
No specific	Torque wrench: range to between 85 and 75 lbf.ft (11.52 and 10.17 m.daN )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.02ABA1)	Phosphate Ester Hydraulic Fluid-General Power - -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
437AL, 438AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
2	FILTER ELEMENT	AIPC 78-37-51-81-030
6	O-RING	AIPC 78-37-51-81-090

E. Referenced Information

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
The Thrust Reverser Hydraulic Filter

3. Job Set-up
Subtask 78-37-51-860-058-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 78-37-51-010-092-A ** ON A/C NOT FOR ALL

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 78-37-51-865-070-A ** ON A/C NOT FOR ALL

C. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

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

Subtask 78-37-51-614-075-A ** ON A/C NOT FOR ALL

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
Subtask 78-37-51-420-063-A ** ON A/C NOT FOR ALL

A. Installation of the Thrust Reverser Hydraulic Valve Filter
(1) Hold the filter bowl (10) with the open end pointing up.
(2) Lubricate a new AIPC 78-37-51-81-090 O-RING (6) with Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) or Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) and install onto DPI body (5) using EXTRACTION TOOL - SEAL and replacement tool.
(3) Install the disc spring (11) in the filter bowl (10).

NOTE: The large diameter of the disc spring (11) facing the bottom of the bowl.

(4) Slide AIPC 78-37-51-81-030 FILTER ELEMENT (2) into filter bowl (10). Make sure full engagement of the filter element (2) by pushing firmly into place.
(5) Install back-up ring (12), O-ring (13), onto filter bowl (10) as shown in figure.

The Thrust Reverser Hydraulic Filter ** ON A/C NOT FOR ALL

(6) Insert C-ring (4) into filter head (1) groove.
(7) Lubricate seals with Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) , then screw filter bowl (10) as assembled, into filter head (1). Make sure the filter element (2) engages with the shut off valve (3) correctly.
(8) TORQUE assembly together to between 85 and 75 lbf.ft (11.52 and 10.17 m.daN )

.
(9) Assemble fire blanket (7) and (8) onto the filter bowl (10) and secure by wire locking (9).

Subtask 78-37-51-865-071-A ** ON A/C NOT FOR ALL

B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

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

Subtask 78-37-51-614-076-A ** ON A/C NOT FOR ALL

C. 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 are no leaks at the tube connections.

Subtask 78-37-51-710-057-A ** ON A/C NOT FOR ALL

D. 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 hydraulic filter is present.
(2) Make sure that there are no leaks at the tube connections.

5. Close-up
Subtask 78-37-51-410-072-A ** ON A/C NOT FOR ALL

A. 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).

[Rev.10 from 2021] 2026.04.01 03:30:12 UTC