Removal of the Self Sealing Half-Coupling of the Yellow Pump Suction (3700GM)

TASK 29-13-39-000-802-A
Removal of the Self Sealing Half-Coupling of the Yellow Pump Suction (3700GM)

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: 400
FIN: 3700GM ** 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)
No specific	1	CONTAINER 10 L(2 1/2 USGAL)
No specific	AR	PLUG - BLANKING
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
400	POWER PLANT, NACELLES AND PYLONS
195BB, 198CB, 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)
Self Sealing Half-Coupling of the Yellow Pump Suction

3. Job Set-up
Subtask 29-13-39-860-054-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 a WARNING NOTICE(S) in position to tell persons not to pressurize the Yellow hydraulic system:

On the ground service panel of the Yellow hydraulic-system access-door 198CB.

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

Subtask 29-13-39-941-054-A ** ON A/C NOT FOR ALL

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

Put a WARNING NOTICE(S) in position to tell persons not to start the engine.

(2) Make sure that the engine 1(2) shutdown occurred not less than five minutes before you do this procedure.
(3) Put a WARNING NOTICE(S) in position to tell persons not to pressurize the Yellow hydraulic system:

In the cockpit, on the HYD section of the HYD/FUEL panel 40VU.

(4) On the maintenance panel 50VU:

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

(5) Put a CONTAINER 10 L(2 1/2 USGAL) below the connection between the pressure hose (1) and the fluid disconnect panel (6) to collect the fluid.

Subtask 29-13-39-010-052-A ** ON A/C NOT FOR ALL

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

4. Procedure
Subtask 29-13-39-020-052-A ** ON A/C NOT FOR ALL

A. Removal of the Self Sealing Half-Coupling of the Yellow Pump Suction

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) Disconnect the hose half-coupling (1) from the self sealing half-coupling (4).
(2) Remove and discard the teflon retainer ring (2) and the O-ring (3) from the self sealing half-coupling (4).
(3) Remove the self sealing half-coupling (4) from the fluid disconnect panel (6).
(4) Remove and discard the O-ring (5) from the self sealing half-coupling (4).
(5) Put a PLUG - BLANKING on the disconnected hose half-coupling (1) and the fluid disconnect panel (6).

[Rev.10 from 2021] 2026.04.01 00:20:59 UTC