Removal of the Engine-1 Pump-Case-Drain Check-Valve

TASK 29-11-37-000-802-A
Removal of the Engine-1 Pump-Case-Drain 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.

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

ZONE: 413
FIN: 1041GM ** 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	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
413	UPPER FWD PYLON
195BB, 197CB
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 29-10-00-864-001-A	Depressurize the Green Hydraulic System
TASK 29-14-00-614-001-A	Depressurization of the Hydraulic Reservoirs
TASK 71-00-00-860-833-A	Procedure to Prevent Engine Motoring
TASK 71-13-00-010-802-A	Opening of the Fan Cowl Doors
Engine-1 Pump-Case-Drain Check-Valve

3. Job Set-up
Subtask 29-11-37-860-055-A ** ON A/C NOT FOR ALL

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

Subtask 29-11-37-941-054-A ** ON A/C NOT FOR ALL

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

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

(2) Open access door 197CB.
(3) Put WARNING NOTICE(S) in position to tell persons not to pressurize the Green hydraulic system:

On the ground service panel
On the HYD section of panel 40VU.

(4) Put a WARNING NOTICE(S) in position on access door 195BB to tell persons not to pressurize the reservoir of the Green hydraulic system.
(5) Do the procedure to prevent engine motoring
(Ref. AMM TASK 71-00-00-860-833).

Subtask 29-11-37-010-052-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL 438AR
(2) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position at the pylon.

4. Procedure
Subtask 29-11-37-020-052-A ** ON A/C NOT FOR ALL

A. Removal of the Engine-1 Pump-Case-Drain 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.

(1) Put a CONTAINER 20L (5 USGAL) below the hydraulic tube connection to collect the remaining fluid.
(2) Disconnect the tube (7) from the check valve (6).
(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 PLUG - BLANKING on the disconnected tube (7) and tube (1).

[Rev.10 from 2021] 2026.04.01 00:15:14 UTC