Removal of the Yellow Engine-2 Thrust-Reverser Check-Valve

TASK 29-13-35-000-804-A
Removal of the Yellow Engine-2 Thrust-Reverser Check-Valve

WARNING: OBEY THE HYDRAULIC SAFETY PROCEDURES.

WARNING: DO NOT TOUCH THE HYDRAULIC SYSTEM COMPONENTS FOR A SHORT TIME AFTER THE ENGINE IS SHUTDOWN. THE ENGINE COMPONENTS STAY HOT FOR SOME TIME AND CAN CAUSE INJURY.

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.

ZONE: 423
FIN: 3010KM2

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 3M (10 FT)- ADJUSTABLE
No specific	AR	CAP - PROTECTION
No specific	1	CONTAINER 20L (5 USGAL)
No specific	AR	PLUG - BLANKING
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
423	UPPER FWD PYLON
195BB, 198CB
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL, 448AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 29-10-00-864-002-A	Depressurize the Yellow Hydraulic System
TASK 29-14-00-614-001-A	Depressurization of the Hydraulic Reservoirs
TASK 71-13-00-010-803-A	Opening of the Fan Cowl Doors
TASK 78-30-00-040-807-A	Deactivation of the Thrust Reverser System for Nacelle Maintenance (ICU)
TASK 78-31-49-000-815-A	Removal of the Pylon Tubes and Hoses
Thrust-Reverser Check-Valve

3. Job Set-up
Subtask 29-13-35-860-056-A

A. Aircraft Maintenance Configuration
(1) Make sure that the Yellow hydraulic system is depressurized.
(Ref. AMM TASK 29-10-00-864-002)
(2) Depressurize the reservoir of the Yellow hydraulic system.
(Ref. AMM TASK 29-14-00-614-001)

Subtask 29-13-35-941-058-A

B. Safety Precautions
(1) On AIR COND panel 30VU:

Make sure that the APU BLEED pushbutton switch is released (the ON legend is off).
Put a WARNING NOTICE(S) in position to tell persons not to operate this pushbutton switch.

(2) Open access door 198CB.
(a) Put WARNING NOTICE(S) in position to tell persons not to pressurize the Yellow hydraulic system on the ground service panel.
(3) On the HYD section of panel 40VU:
(a) Put WARNING NOTICE(S) in position to tell persons not to pressurize the Yellow hydraulic system.
(4) Open access door 195BB:
(a) Put a WARNING NOTICE(S) in position to tell persons not to pressurize the reservoir of the Yellow hydraulic system.
(5) On the center pedestal, on ENG panel 115VU:

Make sure that the ENG/MODE selector switch is in the NORM position.
Make sure that the ENG/MASTER 1(2) control switch was in the OFF position not less than five minutes before you do this procedure.
Put WARNING NOTICE(S) in position to tell persons not to operate the ENG/MODE selector switch and the ENG/MASTER 1(2) control switch.

(6) On the ENG section of maintenance panel 50VU:

Make sure that the ON legend of the FADEC GND PWR/1(2) pushbutton switch is off.
Put a WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).

Subtask 29-13-35-010-059-A

C. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-803):
(a) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR

Subtask 29-13-35-040-055-A

D. Deactivation of the Thrust Reverser for Maintenance

WARNING: YOU MUST DEACTIVATE THE THRUST REVERSER BEFORE YOU DO WORK ON OR AROUND IT. IF YOU DO NOT, THE THRUST REVERSER CAN OPERATE ACCIDENTALLY AND CAUSE AN INJURY AND/OR DAMAGE.

(1) Do the deactivation of the thrust reverser system for maintenance (Ref. AMM TASK 78-30-00-040-807).

Subtask 29-13-35-010-060-A

E. Get Access
(1) Put an ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position at the pylon.

4. Procedure
Subtask 29-13-35-020-057-A

A. Removal of the Yellow Engine-2 Thrust-Reverser Check-Valve

CAUTION: USE TWO WRENCHES TO REMOVE OR INSTALL THE TUBE COUPLING NUTS:

ONE WRENCH TO HOLD THE UNION, AND
ONE TO LOOSEN OR TIGHTEN THE COUPLING NUT.

THIS PREVENTS DAMAGE TO THE PARTS.

CAUTION: BE CAREFUL WHEN YOU REMOVE THE CHECK VALVE AS THE HYDRAULIC FLUID WILL FLOW OUT.

(1) Put a CONTAINER 20L (5 USGAL) below the check valve (6) to collect the remaining fluid.
(2) Remove the pylon tube (7) from the check valve (6) (Ref. AMM TASK 78-31-49-000-815).
(3) Remove the screws (4) and washers (3) from the anti-rotate key (2).
(4) Remove the anti-rotate key (2).
(5) Remove the check valve (6) from the tube (1).
(6) Remove and discard the packing (5).
(7) Put the PLUG-BLANKING in each disconnected line end.
(8) Put CAP - PROTECTION on the two ends of the check valve (6).

[Rev.10 from 2021] 2026.04.01 00:20:25 UTC