Installation of the Priority Valve of the Blue Hydraulic System

TASK 29-12-33-400-001-A
Installation of the Priority Valve 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.

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

FIN: 2064GM

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 1 L (1/4 USGAL)
No specific	2	WARNING NOTICE(S)
No specific	Torque wrench: range to between 0.90 and 0.80 m.daN (79.65 and 70.80 lbf.in )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.02ABA1)	Phosphate Ester Hydraulic Fluid-General Power - -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
195BB

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
4	O-RINGS	AIPC 29-12-14-02-140
8	BACK-UP RINGS	AIPC 29-12-14-02-150
7	BACK-UP RINGS	AIPC 29-12-14-02-160
6	SQUARE-SECTION SEALS	AIPC 29-12-14-02-170

E. Referenced Information

REFERENCE	DESIGNATION
TASK 12-12-29-611-001-A	Fill the Hydraulic Fluid Reservoir with a Hand Pump
TASK 20-23-21-911-001-A	Removal/Installation of the Bobbins from their Housings and Installation of O-rings, Square Seals, and Back-up Rings on the Bobbins
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
Priority Valve on HP Manifold with P/N series D29070173
Priority Valve on HP Manifold with P/N series 1554A9900

3. Job Set-up
Subtask 29-12-33-860-051-A

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 195BB is open.
(5) Make sure that the CONTAINER 1 L (1/4 USGAL) is in position below the HP manifold.
(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 29-12-33-865-051-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	HYD/HYD PWR/B WARN/& CTL	2702GJ	C12
121VU	HYDRAULIC/LOW/LVL/IND	1832GQ	N32
121VU	HYDRAULIC/HYD/QTY/IND	1831GQ	P35
123VU	B HYD/ELEC PUMP	2701GJ	AB09

4. Procedure
Subtask 29-12-33-560-050-A

A. Preparation for Installation
(1) Remove the blanking plugs from the HP manifold and the priority valve (1).
(2) Apply Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) to the new:

Back-up rings (8) and (7)
O-rings (4) and
Square-section seals (6).

(3) Put the two new AIPC 29-12-14-02-160 BACK-UP RINGS (7) in position on the sides of the bobbins (5) without the identification grooves (equipment side).
(4) Put the two new AIPC 29-12-14-02-170 SQUARE-SECTION SEALS (6) in position on the sides of the bobbins (5) without the identification grooves (equipment side).
(5) Put the two new AIPC 29-12-14-02-150 BACK-UP RINGS (8) in position on the sides of the bobbins (5) with the identification grooves (manifold side).
(6) Put the two new AIPC 29-12-14-02-140 O-RINGS (4) in position on the sides of the bobbins (5) with the identification grooves (manifold side).
(7) Install the two bobbins (5) with the identification grooves in the ports of the manifold (Ref. AMM TASK 20-23-21-911-001).

Subtask 29-12-33-420-050-A

B. Installation of the Priority Valve
(1) Clean the component interfaces and the adjacent area.
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Install the priority valve (1) on the manifold.
(4) Install the bolts (2) and the washers (3).
(5) TORQUE the bolts (2) to between 0.90 and 0.80 m.daN (79.65 and 70.80 lbf.in )

Subtask 29-12-33-790-050-A

C. Test
(1) Pressurize the reservoir of the Blue hydraulic system (Ref. AMM TASK 29-14-00-614-001).
(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) Remove the warning notices from the cockpit and the ground service panel.
(4) Pressurize the Blue hydraulic system (Ref. AMM TASK 29-10-00-863-003).
(5) Examine the connection of the priority valve (1) and make sure that there are no leaks.
(6) Depressurize the Blue hydraulic system (Ref. AMM TASK 29-10-00-864-003).

5. Close-up
Subtask 29-12-33-410-050-A

A. Close Access
(1) Remove the container.
(2) Make sure that the work area is clean and clear of tools and other items.
(3) Close the access panel 195BB.

Subtask 29-12-33-865-052-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	HYD/HYD PWR/B WARN/& CTL	2702GJ	C12
121VU	HYDRAULIC/LOW/LVL/IND	1832GQ	N32
121VU	HYDRAULIC/HYD/QTY/IND	1831GQ	P35
123VU	B HYD/ELEC PUMP	2701GJ	AB09

[Rev.10 from 2021] 2026.04.01 08:02:46 UTC