Installation of the Thrust Reverser Hydraulic Isolation Valve [CFMB]

TASK 78-37-51-400-001-A
Installation 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: REFER TO THE MANUFACTURER'S MATERIAL SAFETY DATA SHEETS FOR CONSUMABLE MATERIAL INFORMATION. THIS INCLUDES HAZARDOUS INGREDIENTS, PHYSICAL AND CHEMICAL CHARACTERISTICS, FIRE, EXPLOSION, REACTIVITY, HEALTH HAZARD DATA, PRECAUTIONS FOR SAFE HANDLING, AND USE OF CONTROL MEASURES.

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	CLOTH - PROTECTIVE
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 0.79 and 0.56 m.daN (69.91 and 49.56 lbf.in )
No specific	Torque wrench: range to between 1.02 and 0.85 m.daN (90.27 and 75.22 lbf.in )
No specific	Torque wrench: range to between 1.7 and 1.5 m.daN (12.54 and 11.06 lbf.ft )
No specific	Torque wrench: range to between 3.2 and 2.9 m.daN (23.60 and 21.39 lbf.ft )

B. Consumable Materials

REFERENCE	DESIGNATION
No specific	corrosion resistant steel lockwire 0.8 mm DIA.

C. 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

D. 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 Isolation Valve

3. Job Set-up
Subtask 78-37-51-860-050-C ** 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 78-37-51-010-051-C ** 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 78-37-51-865-052-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 78-37-51-614-051-C ** 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 78-37-51-420-050-C ** ON A/C NOT FOR ALL

A. Installation of the Thrust Reverser Hydraulic Isolation Valve

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

(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 (155) between the spacers (27) and (26) in position on the support plate (5).

NOTE: You must install the shortest spacer (26) on the isolation valve side.

(3) Put the isolation valve (45) in position on the support plate (5) with the four bolts (35), the washers (30) and the spacers (25). Do not tighten the bolts.
(4) Install and connect the pressure supply tube (125) between the filter and the isolation valve (45).
(5) Remove the blanking plugs from the ports of the isolation valve and the filter.
(6) Remove the PLUG-BLANKING from each disconnected line end.
(7) TORQUE the four bolts (35) to between 0.79 and 0.56 m.daN (69.91 and 49.56 lbf.in )

.
(8) Safety the bolts (35) with the corrosion resistant steel lockwire 0.8 mm DIA..
(9) Remove the tube (125).
(10) Install the assembly support plate (5) with the isolation valve (45) in position below the pylon with the bolts (20) and (50) and the washers (15). Do not tighten the bolts.

NOTE: The bolts (50) are shorter than the bolts (20).

(11) Remove the PLUG-BLANKING from each disconnected line end.
(12) Connect the pressure supply tube (70), the control tube (115) and the return tube (120).
(13) TORQUE the coupling nuts of the pressure supply tube (70) and the control tube (115) to between 3.2 and 2.9 m.daN (23.60 and 21.39 lbf.ft )

.
(14) TORQUE the coupling nut of the pressure return tube (120) to between 1.7 and 1.5 m.daN (12.54 and 11.06 lbf.ft )

.
(15) TORQUE the bolts (20) and (50) to between 1.02 and 0.85 m.daN (90.27 and 75.22 lbf.in )

.
(16) Install the clamp (140) with the bolt (130) and the washer (135) to attach the pressure supply tube (70).
(17) Install and connect the pressure supply tube (125) between the filter and the isolation valve (45).
(18) TORQUE the coupling nuts to between 3.2 and 2.9 m.daN (23.60 and 21.39 lbf.ft )

.
(19) Remove the CAP-BLANKING from each electrical connector and receptacle.
(20) Make sure that all the electrical connections are clean and in the correct condition.
(21) Connect the electrical connector (40) to the isolation valve (45).
(22) Remove the protective cloth from the engine.

5. Close-up
Subtask 78-37-51-865-053-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 78-37-51-614-052-C ** ON A/C NOT FOR ALL

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 78-37-51-710-050-C ** 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) 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 78-37-51-410-050-C ** 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 03:26:50 UTC