Installation of the Ground Leakage-Measurement Manifold of the Yellow Hydraulic System

TASK 29-19-41-400-003-A
Installation of the Ground Leakage-Measurement Manifold of the Yellow Hydraulic System

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

FIN: 3146GM ** 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	CONTAINER 2 L (0.53 USGAL)
No specific	1	SCRAPER - NON METALLIC
No specific	2	WARNING NOTICE(S)
No specific	Torque wrench: range to between 3.2 and 2.9 m.daN (23.60 and 21.39 lbf.ft )
No specific	Torque wrench: range to between 5.9 and 5.4 m.daN (43.51 and 39.82 lbf.ft )
No specific	Torque wrench: range to between 8.3 and 7.5 m.daN (61.21 and 55.31 lbf.ft )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.02ABA1)	Phosphate Ester Hydraulic Fluid-General Power - -
(Material No.06AEA1)	Polysulfide Sealant-Low Adhesion Brushable -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
196BB

D. Referenced Information

REFERENCE	DESIGNATION
TASK 12-12-29-611-001-A	Fill the Hydraulic Fluid Reservoir with a Hand Pump
TASK 12-12-29-611-002-A	Fill the Hydraulic Fluid Reservoir with a Hydraulic Service Cart
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
TASK 29-00-00-864-001-A	Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action
TASK 29-00-00-910-002-A	Safety Procedures of the Hydraulic System
TASK 29-10-00-863-002-A	Pressurize the Yellow Hydraulic System with a Hydraulic Ground Power-Cart
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 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 29-23-00-860-001-A	Disconnection of the Isolation Coupling of the Power Transfer Unit (PTU)
TASK 29-23-00-860-002-A	Connection of the Isolation Coupling of the Power Transfer Unit (PTU)
Ground Leakage-Measurement Manifold - Yellow Hydraulic System (3146GM)

3. Job Set-up
Subtask 29-19-41-860-063-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration

WARNING: OBEY THE HYDRAULIC SAFETY PROCEDURES.

(1) Obey the hydraulic safety procedures (Ref. AMM TASK 29-00-00-910-002).
(2) Make sure that the Yellow hydraulic system is depressurized and put it in the maintenance configuration.
(Ref. AMM TASK 29-00-00-864-001).
(3) Make sure that the reservoir of the Yellow hydraulic system is depressurized.
(Ref. AMM TASK 29-14-00-614-001).
(4) Make sure that the WARNING NOTICE(S) are in position to tell persons not to pressurize the Yellow hydraulic system:

In the cockpit on the hydraulic section 40VU of the overhead panel
On the ground service panel of the Yellow hydraulic system.

(5) Make sure that the access door 196BB is open.
(6) Make sure that the CONTAINER 2 L (0.53 USGAL) is in position below the manifold (3146GM) to collect unwanted fluid.
(7) Make sure that the isolation coupling of the Power Transfer Unit (PTU) is disconnected (Ref. AMM TASK 29-23-00-860-001).

Subtask 29-19-41-865-057-A ** ON A/C NOT FOR ALL

B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	HYDRAULIC/SOL VALVES/G/Y/B/LEAK/TST	1881GP	N35
121VU	HYDRAULIC/HYD POWER/Y	3803GX	N30
123VU	Y HYD/ELEC/PUMP	3802GX	AB06
123VU	Y HYD/ELEC/ELEC PUMP/NORM	3801GX	AB03

4. Procedure
Subtask 29-19-41-910-052-A ** ON A/C NOT FOR ALL

A. Preparation for the Installation
(1) Remove the sealant from the mating surface of the manifold (12) and the aircraft structure with a SCRAPER - NON METALLIC.
(2) Examine the structure of the aircraft in the area of the manifold attachment for cracks, corrosion or other damage.
(3) Apply a layer of Polysulfide Sealant-Low Adhesion Brushable - (Material No.06AEA1) to the mating surface of the manifold (12).

Subtask 29-19-41-420-052-B ** ON A/C NOT FOR ALL

B. Installation of the Ground Leakage-Measurement Manifold (3146GM)

Ground Leakage-Measurement Manifold - Yellow Hydraulic System (3146GM) ** ON A/C NOT FOR ALL

CAUTION: USE A SECOND WRENCH TO APPLY COUNTERTORQUE TO THE UNION WHEN YOU DISCONNECT/CONNECT HYDRAULIC LINES ON UNIONS. IF YOU DO NOT USE THE SECOND WRENCH, THERE IS A RISK THAT YOU WILL LOOSEN OR TIGHTEN THE UNION TOO MUCH.

CAUTION: YOU MUST INSTALL HYDRAULIC TUBES WITH HYDRAULIC FLUID AS LUBRICANT.

(1) Put the manifold (12) in position on the aircraft and install the bolts (4) and the washers (5). Do not tighten the bolts (4).
(2) Remove the blanking plugs from the pipe end-fittings and the unions on the manifold (12).
(3) Make sure that the hydraulic line end-fittings are serviceable.
(4) Apply the Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) to the threads of the line end-fittings.
(5) Connect the pipe (9) to the union (11).
(6) TORQUE the pipe end-fitting (10) to between 5.9 and 5.4 m.daN (43.51 and 39.82 lbf.ft )

.
(7) Connect the pipe (8) to the union (6).
(8) TORQUE the pipe end-fitting (7) to between 8.3 and 7.5 m.daN (61.21 and 55.31 lbf.ft )

.
(9) Connect the pipe (16) to the union (18).
(10) TORQUE the pipe end-fitting (17) to between 5.9 and 5.4 m.daN (43.51 and 39.82 lbf.ft )

.
(11) Connect the pipe (1) to the union (3).
(12) TORQUE the pipe end-fitting (2) to between 3.2 and 2.9 m.daN (23.60 and 21.39 lbf.ft )

.
(13) Connect the pipe (15) to the union (13).
(14) TORQUE the pipe end-fitting (14) to between 3.2 and 2.9 m.daN (23.60 and 21.39 lbf.ft )

.
(15) Tighten the bolts (4).

Subtask 29-19-41-865-058-A ** ON A/C NOT FOR ALL

C. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	HYDRAULIC/SOL VALVES/G/Y/B/LEAK/TST	1881GP	N35
121VU	HYDRAULIC/HYD POWER/Y	3803GX	N30
123VU	Y HYD/ELEC/PUMP	3802GX	AB06
123VU	Y HYD/ELEC/ELEC PUMP/NORM	3801GX	AB03

Subtask 29-19-41-860-059-A ** ON A/C NOT FOR ALL

D. Preparation for the Test
(1) Connect the isolation coupling of the Power Transfer Unit (PTU) (Ref. AMM TASK 29-23-00-860-002).
(2) Pressurize the reservoir of the Yellow hydraulic system (Ref. AMM TASK 29-14-00-614-002).
(3) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
(4) Make sure that the fluid level in the reservoir of the Yellow hydraulic system is correct. Add fluid as necessary (Ref. AMM TASK 12-12-29-611-001) or (Ref. AMM TASK 12-12-29-611-002).
(5) Pressurize the Yellow hydraulic system
(Ref. AMM TASK 29-10-00-863-002).
(6) On the maintenance panel 50VU, make sure that the HYD/LEAK MEASUREMENT VALVES/Y pushbutton switch is set to on (OFF light is not on).

Subtask 29-19-41-710-052-B ** ON A/C NOT FOR ALL

E. Test
(1) Make sure there are no leaks from any of the connections or from the manifold.
(2) Turn the three manual selector valves from the CLOSED to the OPEN position and back to the CLOSED position. Make sure that the valves are free to turn and have no leaks.

5. Close-up
Subtask 29-19-41-860-060-A ** ON A/C NOT FOR ALL

A. Put the aircraft back to the serviceable condition.
(1) Depressurize the Yellow hydraulic system
(Ref. AMM TASK 29-10-00-864-002).
(2) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).
(3) Remove the container from below the manifold (1).
(4) Remove the warning notices from the cockpit and the ground service panel.

Subtask 29-19-41-410-052-A ** ON A/C NOT FOR ALL

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the access door 196BB.

[Rev.10 from 2021] 2026.04.01 00:25:37 UTC