Removal of the Engine 2 Yellow Hydraulic Pump Delivery Check Valve

TASK 29-13-36-000-001-A
Removal of the Engine 2 Yellow Hydraulic Pump Delivery 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: 420
FIN: 3050GM ** 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	1	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific	AR	CONTAINER 5 L (1.32 USGAL)
No specific	AR	PLUG - BLANKING
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
420	ENG 2 PYLON BOX AND FORWARD FAIRING
447AL

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 71-13-00-010-010-A	Opening of the Fan Cowls 437AL(447AL),438AR(448AR)
TASK 71-13-00-010-040-A	Opening of the Fan Cowl Doors
TASK 71-13-00-010-040-B	Opening of the Fan Cowl Doors
Engine 2 Pump Delivery Check Valve

3. Job Set-up
Subtask 29-13-36-860-050-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Depressurize the Yellow hydraulic system (Ref. AMM TASK 29-10-00-864-002).
(2) Depressurize the Yellow hydraulic reservoir (Ref. AMM TASK 29-14-00-614-001).
(3) Put WARNING NOTICE(S) in position to tell persons not to pressurize the Yellow hydraulic system:

on the ground service panel 198CB.

(4) Put WARNING NOTICE(S) on the access door 195BB to tell persons not to pressurize the Yellow hydraulic reservoir.

Subtask 29-13-36-941-051-A ** ON A/C NOT FOR ALL

B. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:

put 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) Put WARNING NOTICE(S) in position to tell persons not to pressurize the Yellow hydraulic system:

in the cockpit, on the HYD section of the overhead panel 40VU.

(4) On the overhead maintenance panel 50VU:

make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.

(5) Put WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).
(6) Put a CONTAINER 5 L (1.32 USGAL) below the connection between the pressure hose and the fluid disconnect panel to collect the remaining fluid.

Subtask 29-13-36-941-051-B ** ON A/C NOT FOR ALL

B. Safety Precautions
(1) On the ENG panel 115VU:

make sure that the ENG 2 switch is in the OFF position
put a WARNING NOTICE(S) to tell persons not to start the engine.

(2) Make sure that the engine 2 shutdown occurred not less than 5 minutes before you do this procedure.
(3) Put a WARNING NOTICE(S) in position to tell persons not to pressurize the Yellow hydraulic system:

on the HYD section of the panel 40VU.

(4) On the ENG section of the panel 50VU:

make sure that the ON legend of the ENG/FADEC/GND/PWR 2 pushbutton switch is off.

(5) Put a WARNING NOTICE(S) to tell persons not to energize the FADEC system.
(6) Put a CONTAINER 5 L (1.32 USGAL) below the connection below the check valve.

Subtask 29-13-36-010-050-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Open the left fan-cowl door 447AL (Ref. AMM TASK 71-13-00-010-040).
(2) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position at the engine.

Subtask 29-13-36-010-050-B ** ON A/C NOT FOR ALL

C. Get Access
(1) Open the left fan-cowl door 447AL (Ref. AMM TASK 71-13-00-010-010).
(2) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position at the engine.

4. Procedure
Subtask 29-13-36-020-051-A ** ON A/C NOT FOR ALL

A. Removal of the Check Valve

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

(1) Hold the check valve (1) with a wrench and disconnect the hose (2).
(2) Put PLUG - BLANKING on the disconnected hose (2) and on the check valve (1).
(3) Remove the check valve (1) with the O-ring (3) from the panel (4).

(4) Put blanking plugs on the panel port (4) and on the check valve (1).

[Rev.10 from 2021] 2026.04.01 04:45:38 UTC