Removal of the Thrust Reverser Hydraulic Isolation Valve [CFMB]

TASK 78-37-51-000-001-A
Removal of the Thrust Reverser Hydraulic Isolation Valve

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE PARTS AFTER THE ENGINE SHUTDOWN. USE APPLICABLE THERMAL GLOVES. THE ENGINE PARTS CAN STAY HOT FOR ONE HOUR AFTER SHUTDOWN AND CAN BURN YOU.

WARNING: WEAR A FACE SHIELD WHICH IS RESISTANT TO HIGH PRESSURE JETS WHEN YOU WORK ON PRESSURIZED SYSTEMS.

WARNING: DO NOT GET THE FLUID ON YOUR SKIN OR IN YOUR EYES. IF YOU DO:

FLUSH IT AWAY WITH CLEAN WATER
GET MEDICAL AID.

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.

ZONE: 400
FIN: 50EG1 ** ON A/C NOT FOR ALL
FIN: 50EG2 ** ON A/C NOT FOR ALL

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	CAP - BLANKING
No specific	AR	CLOTH - PROTECTIVE
No specific	AR	CONTAINER 3 L(3/4 USGAL)
No specific	AR	PLIERS - NOSE, SOFT, LONG
No specific	AR	PLUG - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
400	POWER PLANT, NACELLES AND PYLONS
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 71-13-00-010-040-B	Opening of the Fan Cowl Doors
Thrust Reverser Hydraulic Isolation Valve

3. Job Set-up
Subtask 78-37-51-941-050-C ** 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 78-37-51-010-050-C ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-040):
(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 78-37-51-865-051-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 78-37-51-614-050-C ** ON A/C NOT FOR ALL

D. Depressurization of the hydraulic reservoirs
(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 78-37-51-020-050-C ** ON A/C NOT FOR ALL

A. Removal of the Thrust Reverser Hydraulic Isolation Valve

Thrust Reverser Hydraulic Isolation Valve ** ON A/C NOT FOR ALL

(1) Disconnect the electrical connector (40) from the thrust reverser isolation valve (45).

NOTE: If necessary, use the PLIERS - NOSE, SOFT, LONG to loosen the electrical connector.

(2) Put CAP - BLANKING on the electrical connector of the harness and on the isolation valve.
(3) Remove the bolt (130) and the washer (135) that attach the clamp (140).
(4) Disconnect the hydraulic tubes.
(a) Put a CONTAINER 3 L(3/4 USGAL) below the tubes.
(b) Disconnect the pressure supply tube (70), control tube (115) and return tube (120). Let the hydraulic fluid drain into the container.
(c) Disconnect and remove the pressure supply tube (125) between the filter and the isolation valve (45).
(d) Remove the container and put a CLOTH - PROTECTIVE below the isolation valve.
(e) Put the PLUG-BLANKING in each disconnected line end.
(5) Remove the bolts (20) and (50) and washers (15) that attach the support plate (5) (where the isolation valve and its filter are installed) below the pylon.
(6) Remove the support plate assembly (5) from the pylon.
(7) Put the PLUG-BLANKING in each disconnected line end.
(8) Cut and remove the lockwire which safeties the bolts (35).
(9) Loosen and remove the four bolts (35), washers (30) and spacers (25), (26) and (27) that attach the isolation valve (45) and the thermal isolation (155) on the support plate (5).
(10) Remove the isolation valve (45) and the thermal isolation (155) from the support plate (5).
(11) Put blanking plugs on the open ports of the isolation valve and of the filter.
(12) Remove the protective cloth from the engine.

[Rev.10 from 2021] 2026.04.01 03:26:49 UTC