Installation of the Pulsation Dampener of the Blue Hydraulic System

TASK 29-12-46-400-001-A
Installation of the Pulsation Dampener of the Blue Hydraulic System

WARNING: MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING GEAR. THIS WILL PREVENT UNWANTED MOVEMENT OF THE LANDING GEAR, AND THUS POSSIBLE INJURY TO PERSONS AND DAMAGE TO THE AIRCRAFT AND/OR EQUIPMENT.

FIN: 2092GM ** 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 - HYDRAULIC FLUID RESISTANT
No specific	1	SCRAPER - NON METALLIC
No specific	2	WARNING NOTICE(S)
No specific	Torque wrench: range to between 5.9 and 5.4 m.daN (43.51 and 39.82 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
195BB

D. Referenced Information

REFERENCE	DESIGNATION
TASK 12-12-29-611-001-A	Fill the Hydraulic Fluid Reservoir with a Hand Pump
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 29-10-00-863-003-A	Pressurize the Blue Hydraulic System with a Hydraulic Ground Power-Cart
TASK 29-10-00-863-003-A-01	Pressurize the Blue Hydraulic System with the Blue Electric Pump
TASK 29-10-00-864-003-A	Depressurize the Blue 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)
Hydraulic Pulsation Dampener ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 29-12-46-860-051-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 Blue 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 Blue hydraulic system is depressurized.
(Ref. AMM TASK 29-14-00-614-001).
(4) Make sure that the access panel 197BB is open.
(5) Make sure that the CONTAINER - HYDRAULIC FLUID RESISTANT is in position below the location of the pulsation dampener.
(6) Make sure that the WARNING NOTICE(S) are in position to tell persons not to pressurize the Blue hydraulic system:

in the cockpit on the hydraulic section 40VU of the overhead panel,
on the ground service panel of the Blue hydraulic system.

Subtask 29-12-46-865-051-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
49VU	HYD/HYD PWR/B WARN/& CTL	2702GJ	C12
123VU	B HYD/ELEC PUMP	2701GJ	AB09

4. Procedure
Subtask 29-12-46-910-050-A ** ON A/C NOT FOR ALL

A. Preparation for Installation
(1) Remove the sealant from the mating surface of the pulsation dampener (3) and the aircraft structure with a SCRAPER - NON METALLIC.
(2) Clean the component interfaces and the adjacent area.
(3) Do an inspection of the component interfaces and the adjacent area.
(4) Apply a layer of Polysulfide Sealant-Low Adhesion Brushable - (Material No.06AEA1) to the mating surface of the pulsation dampener (3).

Subtask 29-12-46-420-050-A ** ON A/C NOT FOR ALL

B. Installation of the Pulsation Dampener

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) Remove the blanking plugs from the line ends.
(2) Make sure that the hydraulic line end-fittings are serviceable.
(3) Apply Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) to the pipe end-fittings.
(4) Put the pulsation dampener (3) in position and install the nut (4).
(5) Connect the hose (1) to the pulsation dampener (3).
(6) TORQUE the pipe end-fitting (2) to between 5.9 and 5.4 m.daN (43.51 and 39.82 lbf.ft )

.
(7) Connect the hose (6) to the pulsation dampener (3).
(8) TORQUE the pipe end-fitting (5) to between 5.9 and 5.4 m.daN (43.51 and 39.82 lbf.ft )

Subtask 29-12-46-865-052-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
49VU	HYD/HYD PWR/B WARN/& CTL	2702GJ	C12
123VU	B HYD/ELEC PUMP	2701GJ	AB09

Subtask 29-12-46-790-050-A ** ON A/C NOT FOR ALL

D. Leak Test of the Hydraulic Connections
(1) Pressurize the reservoir of the Blue hydraulic system (Ref. AMM TASK 29-14-00-614-002).
(2) Make sure that the fluid level in the reservoir of the Blue hydraulic system is correct. Add fluid as necessary (Ref. AMM TASK 12-12-29-611-001).
(3) Pressurize the Blue hydraulic system (Ref. AMM TASK 29-10-00-863-003).
(4) Examine the connections of pulsation dampener (3) and make sure that there are no leaks.
(5) Depressurize the Blue hydraulic system (Ref. AMM TASK 29-10-00-864-003).

5. Close-up
Subtask 29-12-46-942-050-A ** ON A/C NOT FOR ALL

A. Put the aircraft back to the serviceable condition.
(1) Remove the container.
(2) Remove the WARNING NOTICE(S).

Subtask 29-12-46-410-050-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 panel 195BB.

[Rev.10 from 2021] 2026.04.01 00:19:41 UTC