Installation of the Thrust Reverser Hydraulic Filter Assembly [CFMB]

TASK 78-37-51-400-004-A
Installation of the Thrust Reverser Hydraulic Filter Assembly

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

WARNING: WEAR APPLICABLE PERSONAL PROTECTIVE EQUIPMENT (PPE) WHEN YOU DO THIS TASK. BEFORE YOU USE PPE, READ, UNDERSTAND AND OBEY ALL INSTRUCTIONS FOR ITS USE. THESE INSTRUCTIONS INCLUDE INSTRUCTIONS FROM THE MANUFACTURER, YOUR EMPLOYER AND GOVERNMENT REGULATIONS. YOU CAN GET INJURED IF YOU DO NOT USE PPE. GET INSTRUCTIONS FROM YOUR EMPLOYER ON WHICH PPE IS NECESSARY.

CAUTION: MAKE SURE THERE IS NO UNWANTED MATERIAL IN THE PORTS AND ORIFICES OR DAMAGE CAN OCCUR.

CAUTION: YOU MUST INSTALL HYDRAULIC TUBES WITH HYDRAULIC FLUID AS LUBRICANT.

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

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 1M(3 FT)
No specific	AR	CLOTH - PROTECTIVE
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 1.79 and 1.38 m.daN (13.20 and 10.18 lbf.ft )
No specific	Torque wrench: range to between 3.2 and 2.9 m.daN (23.60 and 21.39 lbf.ft )

B. Work Zones and Access Panels

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

C. 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 71-13-00-010-040-B	Opening of the Fan Cowl Doors
TASK 71-13-00-410-040-B	Closing of the Fan Cowl Doors
TASK 78-31-00-710-042-A	Operational Test of the Thrust Reverser System
Thrust Reverser Hydraulic Filter Assembly

3. Job Set-up
Subtask 78-37-51-860-056-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 78-37-51-010-087-A ** ON A/C NOT FOR ALL

B. Make sure that the fan cowl doors are open (Ref. AMM TASK 71-13-00-010-040):
(1) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(2) FOR [1000EM2] (ENGINE-2)
447AL 448AR.

Subtask 78-37-51-865-064-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 78-37-51-614-069-A ** ON A/C NOT FOR ALL

D. Depressurization of the Hydraulic Reservoirs
(1) For engine 1:

Make sure that the reservoir of the Green hydraulic system is depressurized
(Ref. AMM TASK 29-14-00-614-001)

(2) For engine 2:

Make sure that the reservoir of the Yellow hydraulic system is depressurized.
(Ref. AMM TASK 29-14-00-614-001)

4. Procedure
Subtask 78-37-51-420-061-A ** ON A/C NOT FOR ALL

A. Installation of the Thrust Reverser Hydraulic Filter Assembly

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

(1) Put a CLOTH - PROTECTIVE in the location where you will install the thrust reverser hydraulic filter assembly.
The hydraulic fluid will cause damage to the engine.
(2) Put the hydraulic filter assembly (30) in position on the support plate (50) with the four bolts (40) and the four washers (45). Do not torque the bolts (40) at this time.
(3) Remove the blanking plugs from the ports of the filter assembly (30).
(4) Remove the blanking plugs from the disconnected line ends (20) and (25).
(5) Connection of the pressure supply tubes

CAUTION: USE A SECOND WRENCH TO APPLY COUNTER TORQUE WHEN YOU DISCONNECT/CONNECT HYDRAULIC TUBES.

(a) Connect the pressure supply tube (25) to the filter (30) and the isolation valve (35). Do not torque the tube (25) at this time.
(b) Connect the pressure supply tube (20) to the filter (30). Do not torque the tube (20) at this time.
(6) TORQUE the four bolts (40) to between 1.79 and 1.38 m.daN (13.20 and 10.18 lbf.ft )

.
(7) TORQUE the coupling nut of the pressure supply tubes (20) and (25) to between 3.2 and 2.9 m.daN (23.60 and 21.39 lbf.ft )

.
(8) Install the clamp (15) with the bolt (5) and the washer (10) to attach the pressure supply tube (20).
(9) Remove the protective cloth from the engine.

5. Close-up
Subtask 78-37-51-865-065-A ** ON A/C NOT FOR ALL

A. 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 78-37-51-614-070-A ** ON A/C NOT FOR ALL

B. Pressurization of the Hydraulic Reservoirs
(1) For engine 1:

Pressurize the reservoir of the Green hydraulic system (Ref. AMM TASK 29-14-00-614-002).

(2) For engine 2:

Pressurize the reservoir of the Yellow hydraulic system (Ref. AMM TASK 29-14-00-614-002).

(3) Make sure that there are no leaks at the tube connections.

Subtask 78-37-51-710-055-A ** ON A/C NOT FOR ALL

C. Test and Bleed Procedure
(1) Operate the thrust reverser for ten deploy-to-stow cycles (Ref. AMM TASK 78-31-00-710-042).
(2) Do a check on the CFDS that there are no messages related to the isolation valve.
(3) Make sure that there are no leaks at the tube connections.

Subtask 78-37-51-410-070-A ** ON A/C NOT FOR ALL

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 71-13-00-410-040):
(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 03:26:52 UTC