Installation of the Thrust Reverser HCU Filter Cartridge [IAE]

TASK 78-31-51-400-011-A
Installation of the Thrust Reverser HCU Filter Cartridge

WARNING: DO NOT GET HYDRAULIC FLUID ON YOUR SKIN, IN YOUR EYES OR IN YOUR MOUTH. HYDRAULIC FLUID IS POISONOUS AND CAN GO THROUGH YOUR SKIN AND INTO YOUR BODY. FLUSH HYDRAULIC FLUID FROM YOUR EYES, MOUTH OR SKIN WITH WATER. GET MEDICAL AID IF YOU GET HYDRAULIC FLUID IN YOUR EYES OR MOUTH.

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: 4101KS1 ** ON A/C NOT FOR ALL
FIN: 4101KS2 ** ON A/C NOT FOR ALL

1. Reason for the Job
This task supplies the data to install the thrust reverser Hydraulic Control Unit (HCU) filter cartridge and to reset the clog indicator.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 2M (6 FT)
No specific	AR	WARNING NOTICE(S)
IAE1N20049	2	PIN - LOCKOUT ACTUATOR

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.V02-156)	lockwire

C. Work Zones and Access Panels

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

D. Referenced Information

REFERENCE	DESIGNATION
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 70-23-13-911-010-A	Procedures for the Installation of Preformed Packings
TASK 71-13-00-010-010-A	Opening of the Fan Cowls 437AL(447AL),438AR(448AR)
TASK 71-13-00-410-010-A	Closing of the Fan Cowls 437AL(447AL),438AR(448AR)
TASK 78-30-00-040-012-A	Deactivation of the Thrust Reverser Hydraulic Control Unit (HCU) for Ground Maintenance
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	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
HCU Filter Module and Clog Indicator
Thrust-Reverser Locking Actuator

3. Job Set-up
Subtask 78-31-51-860-052-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 2M (6 FT) is in position.

Subtask 78-31-51-010-063-A ** ON A/C NOT FOR ALL

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

Subtask 78-31-51-040-058-A ** ON A/C NOT FOR ALL

C. Deactivation of the thrust reverser

WARNING: MAKE SURE THAT THE THRUST REVERSER HYDRAULIC CONTROL UNIT (HCU) IS DEACTIVATED BEFORE YOU DO WORK ON OR AROUND THE THRUST REVERSER. IF THE HCU IS NOT DEACTIVATED, THERE IS A RISK OF UNWANTED THRUST REVERSER OPERATION WHICH CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.

(1) Make sure that the thrust reverser Hydraulic Control Unit (HCU) is deactivated (Ref. AMM TASK 78-30-00-040-012).

4. Procedure
Subtask 78-31-51-420-056-A ** ON A/C NOT FOR ALL

A. Installation of the filter cartridge

HCU Filter Module and Clog Indicator ** ON A/C NOT FOR ALL

(1) Install the filter cartridge (4) in the filterhead (1).

NOTE: Make sure that the packing is not damaged. If packing is damaged, replace with new packing (Ref. AMM TASK 70-23-13-911-010).

(2) Install the filter bowl (3) on the filter head (1).

NOTE: Make sure that the packing is not damaged. If packing is damaged, replace with new packing (Ref. AMM TASK 70-23-13-911-010).

(a) Tighten the filter bowl by hand.
(b) Safety the filter bowl with lockwire (Material No.V02-156) .

Subtask 78-31-51-420-064-A ** ON A/C NOT FOR ALL

B. Installation of the clog indicator sight glass

HCU Filter Module and Clog Indicator ** ON A/C NOT FOR ALL

(1) Push the red indicator magnet (7) in to reset the clog indicator.
(2) Put the sight glass (5) on the filter head (1).
(3) Install the retaining ring (6) to hold the sight glass (5) in position. Tighten the retaining ring by hand.

Subtask 78-31-51-440-056-A ** ON A/C NOT FOR ALL

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

Subtask 78-31-51-863-051-A ** ON A/C NOT FOR ALL

D. Pressurization of 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).

Subtask 78-31-51-870-051-A ** ON A/C NOT FOR ALL

E. Bleed the air from the thrust reverser hydraulic actuation system

Thrust-Reverser Locking Actuator ** ON A/C NOT FOR ALL

CAUTION: MAKE SURE THAT ALL CAUGHT AIR IS BLED FROM THE SYSTEM. IF YOU DO NOT DO THIS, CAUGHT AIR CAN CAUSE UNSATISFACTORY OPERATION OF THE TRANSLATING SLEEVES. TEN CYCLES OF TRANSLATING SLEEVE POWER EXTENSION AND RETRACTION WILL REMOVE ALL CAUGHT AIR FROM THE SYSTEM.

CAUTION: YOU MUST MOVE THE LOCK LEVERS OF THE TWO LOCKING ACTUATORS AFT TO THE UNLOCKED POSITION BEFORE YOU BLEED THE SYSTEM. IF YOU DO NOT DO THIS, UNEVEN OPERATION OF THE TRANSLATING SLEEVES CAN CAUSE DAMAGE TO THE SYSTEM.

(1) Move the lock levers (18) of the left and right locking actuators aft to the unlocked position and install the IAE1N20049 PIN - LOCKOUT ACTUATOR (19), to hold the lock levers in the unlocked position.
(2) Operate the system:

WARNING: MAKE SURE THAT THERE ARE NO PERSONS IN THE AREA AROUND THE THRUST REVERSER BEFORE YOU DO A POWER EXTENSION OR RETRACTION OF THE TRANSLATING SLEEVES. THE TRANSLATING SLEEVES EXTEND AND RETRACT IN 4.5 SECONDS OR LESS AND CAN CAUSE INJURY AND DAMAGE.

(a) Operate the system through ten cycles of translating sleeve power extension and retraction (Ref. AMM TASK 78-31-00-710-041).
(3) Remove the lockout pins:

CAUTION: THE LOCKING ACTUATOR LOCK LEVERS MUST BE IN THE FORWARD LOCKED POSITION FOR FLIGHT OPERATION.

(a) Remove the lockout pins (IAE1N20049) (19) from the lock levers (18) of the left and right locking actuators and move the lock levers forward to the locked position.
(4) Make sure there is no leaks at the filter bowl.

5. Close-up
Subtask 78-31-51-410-060-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) Close the fan cowls (Ref. AMM TASK 71-13-00-410-010):
(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 03:27:42 UTC