Installation of the Thrust Reverser Hydraulic Manual Control Valve [IAE]

TASK 78-31-44-400-010-A
Installation of the Thrust Reverser Hydraulic Manual Control 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.

CAUTION: DO NOT LET HYDRAULIC FLUID FALL ON THE ENGINE. UNWANTED HYDRAULIC FLUID MUST BE REMOVED IMMEDIATELY WITH A CLEAN LINT FREE CLOTH. THE FLUID CAN CAUSE DAMAGE TO THE SURFACE PROTECTION AND TO SOME PARTS.

FIN: 3011KM1 ** ON A/C NOT FOR ALL
FIN: 3011KM2 ** 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 3M (10 FT)
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 8.3 and 7.5 m.daN (61.21 and 55.31 lbf.ft )

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
413AL
FOR [1000EM2] (ENGINE-2)
423AL

C. Referenced Information

REFERENCE	DESIGNATION
TASK 12-12-29-611-001-A	Fill the Hydraulic Fluid Reservoir with a Hand Pump
TASK 29-10-00-863-001-A	Pressurize the Green Hydraulic System with a Hydraulic Ground Power-Cart
TASK 29-10-00-863-002-A	Pressurize the Yellow Hydraulic System with a Hydraulic Ground Power-Cart
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 29-23-00-863-001-A	Pressurize the Green Hydraulic System from the Yellow Hydraulic System through the PTU with the Electric Pump
TASK 78-30-00-440-012-A	Re-activation of the Thrust Reverser Hydraulic Control Unit (HCU) after Ground Maintenance
TASK 78-31-00-710-041-A-02	Operational test of the Thrust Reverser without the CFDS and Engine Running
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
Manual Control Valve

3. Job Set-up
Subtask 78-31-44-860-050-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 3M (10 FT) is in position.

Subtask 78-31-44-630-050-A ** ON A/C NOT FOR ALL

B. Remove the caps from the openings.

NOTE: Do not remove the blanking plug from the pipe (1).

4. Procedure
Subtask 78-31-44-860-051-A ** ON A/C NOT FOR ALL

A. Prepare the installation of the manual control valve (7).
(1) Make sure that the lever (4) is in the NORMAL position and lockwired.
(2) Clean the component interfaces and the adjacent area.
(3) Do an inspection of the component interfaces and the adjacent area.

Subtask 78-31-44-420-050-B ** ON A/C NOT FOR ALL

B. Installation of the Thrust Reverser Hydraulic Manual Control Valve.
(1) Remove the blanking plug from the pipe (1) and immediately connect the pipe (1) to the valve (7).

NOTE: Hydraulic fluid flows from the pipe (1). Connect the pipe (1) to the valve (7) before the end of hydraulic flow. If you do not the reservoir will become empty.

(2) Tighten the pipe nut (8) by hand.
(3) Make sure that the hydraulic fluid flows drops by drops out of the valve (7) port to the HCU.

NOTE: The non-return valve of the manual control valve (7) has two slots, and you have to let the empty in the valve (7) become full before you check the hydraulic fluid leakage.

Subtask 78-31-44-420-051-A ** ON A/C NOT FOR ALL

C. Installation of the Manual Control Valve:
(1) Put the manual control valve (7) in position and install the bolts (2) with the washers (3). Tighten the bolts (2).
(2) Connect the pipe (5) to the manual control valve (7).
(3) TORQUE the pipe nuts (6) and (8) to between 8.3 and 7.5 m.daN (61.21 and 55.31 lbf.ft )

Subtask 78-31-44-210-050-A ** ON A/C NOT FOR ALL

D. Make sure that the level of hydraulic fluid in reservoirs is correct.
If necessary, fill the reservoir (Ref. AMM TASK 12-12-29-611-001).

Subtask 78-31-44-614-052-A ** ON A/C NOT FOR ALL

E. Pressurize the Hydraulic Systems:

WARNING: PRESSURIZATION OF THE HYDRAULIC SYSTEM CAN RESULT IN INADVERTENT THRUST REVERSER OPERATION. REMOVE ALL PERSONNEL FROM THE AREA AROUND THE THRUST REVERSER BEFORE THE HYDRAULIC SYSTEM IS PRESSURIZED. FAILURE TO COMPLY CAN RESULT IN INJURY TO PERSONNEL.

(1) Pressurize the hydraulic reservoirs (Ref. AMM TASK 29-14-00-614-002).
(2) Pressurize the applicable hydraulic system (Ref. AMM TASK 29-10-00-863-001) or (Ref. AMM TASK 29-10-00-863-002) or (Ref. AMM TASK 29-23-00-863-001).
(3) Check that there is no leaks at the pipe nut (8).

Subtask 78-31-44-440-050-A ** ON A/C NOT FOR ALL

F. Activate the HCU (Ref. AMM TASK 78-30-00-440-012).

Subtask 78-31-44-710-050-A ** ON A/C NOT FOR ALL

G. Do an operational test of the thrust reverser system (Ref. AMM TASK 78-31-00-710-041).

NOTE: Do ten deploy/stow cycles to bleed the air from the thrust reverser system.

NOTE: As an alternative procedure, you can do the operational test without the CFDS (Ref. AMM TASK 78-31-00-710-041).

Subtask 78-31-44-790-050-A ** ON A/C NOT FOR ALL

H. Do a leak Check:
(1) Make sure that there is no leaks at the manual control valve.
(2) Remove the container and discard the drained fluid.

5. Close-up
Subtask 78-31-44-410-050-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) Install the pylon access panel
(a) FOR [1000EM1] (ENGINE-1)
413AL
(b) FOR [1000EM2] (ENGINE-2)
423AL
(3) Remove the access platform(s).
(4) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 03:27:35 UTC