Removal of the Thrust Reverser Hydraulic Valve Filter [IAE]

TASK 78-37-51-000-012-A
Removal 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	CAN - DRAIN
No specific	1	EXTRACTION TOOL - SEAL
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	1	WARNING NOTICE(S)

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 71-13-00-010-010-A	Opening of the Fan Cowls 437AL(447AL),438AR(448AR)
The Thrust Reverser Hydraulic Filter

3. Job Set-up
Subtask 78-37-51-941-072-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:
(a) Put a WARNING NOTICE(S) to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).

Subtask 78-37-51-010-091-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-010):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR.
(2) Put the ACCESS PLATFORM 1M(3 FT) in position in the left side of engine.

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

C. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	ENG2/REV/LOCK	1EG2	N45
121VU	ENG1/REV/LOCK	1EG1	N44

Subtask 78-37-51-614-074-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 78-37-51-020-063-A ** ON A/C NOT FOR ALL

A. Removal of the Thrust Reverser Hydraulic Valve Filter
(1) Put a CAN - DRAIN below the filter.
(2) Cut and remove locking wire (9). Remove the fire blanket (7) and (8).
(3) Loosen the filter bowl (10) from the filter head (1).
(4) Remove the filter element (2) from the filter bowl (10).
(5) Remove seals C-ring (4), O-ring (12) and back-up ring (13). Discard the seals C-ring (4), O-ring (12) and back-up ring (13).
(6) Remove seal (6) from the Differential Pressure Indicator (DPI) (5) in the filter bowl using EXTRACTION TOOL - SEAL. Discard the seal (6).
(7) Remove the CAN - DRAIN.

[Rev.10 from 2021] 2026.04.01 03:30:11 UTC