Functional Test of the Pressurizing System of the Hydraulic Reservoirs

TASK 29-14-00-720-001-A
Functional Test of the Pressurizing System of the Hydraulic Reservoirs

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	2	WARNING NOTICE(S)
97A29102035000	1	CONNECTOR-PRESSURIZING,HYDRAULIC TANK
98D29003501000	1	FILL UNIT-AIR PRESSURIZING TOOL, HYDRAULIC RESERVOIR
98D29003501003	1	FILL UNIT - AIR

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
195BB, 196BB, 197CB, 197EB, 197FB, 198CB

C. Referenced Information

REFERENCE	DESIGNATION
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 29-14-00-614-001-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 32-12-00-010-001-A	Open the Main Gear Doors for Access
TASK 32-12-00-410-001-A	Close the Main Gear Doors after Access
TASK 36-12-00-710-001-A	Operational Test of the APU Bleed Air Supply and Crossbleed Systems
TASK 49-00-00-860-005-A	APU Start by External Power
TASK 49-00-00-860-005-A-01	APU Start by Batteries
TASK 49-00-00-860-006-A	APU Shutdown by External Power
TASK 49-00-00-860-006-A-01	APU Shutdown by Batteries
TASK 49-00-00-860-008-A	APU Start by External Power
TASK 49-00-00-860-008-A-01	APU Start by Batteries
TASK 49-00-00-860-009-A	APU Shutdown by External Power (131-9(A))
TASK 49-00-00-860-009-A-01	APU Shutdown by Batteries (131-9(A))

3. Job Set-up
Subtask 29-14-00-010-054-A

A. Get Access
(1) Open the access doors 195BB 196BB 197CB 197EB 197FB 198CB.
(2) Open the right door of the main landing-gear (Ref. AMM TASK 32-12-00-010-001).

Subtask 29-14-00-865-052-A

B. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
123VU	B HYD/ELEC PUMP	2701GJ	AB09
123VU	Y HYD/ELEC/PUMP	3802GX	AB06
123VU	Y HYD/ELEC/ELEC PUMP/NORM	3801GX	AB03

Subtask 29-14-00-860-050-B

C. Aircraft Maintenance Configuration

WARNING: OBEY THE HYDRAULIC SAFETY PROCEDURES.

(1) Obey the hydraulic safety procedures (Ref. AMM TASK 29-00-00-910-002).
(2) Depressurize the Green, Yellow and Blue hydraulic systems and put them in the maintenance configuration (Ref. AMM TASK 29-00-00-864-001).
(3) Put WARNING NOTICE(S) to tell persons not to pressurize the hydraulic systems:

In the flight compartment near the hydraulic section 40VU of the overhead panel.
On the ground service panels of the Green, Yellow and Blue hydraulic systems.

(4) Depressurize the reservoirs of the Green, Yellow and Blue hydraulic systems (Ref. AMM TASK 29-14-00-614-001).
(5) Remove the blanking cap from the reservoir-pressurization ground connector (referred to as ground connector) on the reservoir pressurization unit 1360GM.
(6) Connect the 98D29003501000 FILL UNIT-AIR PRESSURIZING TOOL, HYDRAULIC RESERVOIR or 98D29003501003 FILL UNIT - AIR to the ground connector.

NOTE: If the pressurizing tool is not available, you can use an alternative air supply. The supply must have a pressure of 5 bar (73 psi) and it must have a filter. The rating of the filter must be 5 microns or better.
As alternative to the air source, you can use the nitrogen source with 97A29102035000 CONNECTOR-PRESSURIZING,HYDRAULIC TANK.

(7) Open the ground connector.

4. Procedure
Subtask 29-14-00-720-050-B

A. Do this test:

ACTION	RESULT
1.On the ground air supply: Set the supply at 5 bar (73 psi).
2.Pressurize the reservoirs of the three hydraulic systems (Ref. AMM TASK 29-14-00-614-002).	On the air pressure gages: The pressure in each reservoir increases to 50 psig.
3.On the ground air supply: Stop the supply of air to the reservoir pressurizing system. Disconnect the ground supply from the ground connector 1391GM but keep the ground connector open.	On the air pressure gages: The pressure in the reservoirs is constant.
4.On the ground connector 1391GM: Close the ground connector.
5.On the water separator: Push the drain valve in and hold it in the open position. Release the drain valve of the water separator 1061GM and allow it to go to the closed position.	On the air pressure gages: The pressure in the reservoirs is constant.
6.Depressurize the reservoirs of the three hydraulic systems (Ref. AMM TASK 29-14-00-614-001).	On the air pressure gages: The pressure in the reservoirs decreases to zero.
7.Start the APU (Ref. AMM D/O 49-00-00-86) or (Ref. AMM TASK 49-00-00-860-005) or (Ref. AMM TASK 49-00-00-860-008).
8.Set the bleed air supply from the APU to supply the reservoir pressurizing system (Ref. AMM TASK 36-12-00-710-001).	On the air pressure gages: The pressure in each reservoir increases to between 20 and 40 psig.
9.Stop the operation of the APU (Ref. AMM D/O 49-00-00-86) or (Ref. AMM TASK 49-00-00-860-006) or (Ref. AMM TASK 49-00-00-860-009).
10.Connect the ground air supply to the ground connector 1391GM of the air pressurization manifold 1370GM.
11.On the ground connector 1391GM: Open the ground connector.
12.Pressurize the reservoirs of the hydraulic systems to 50 psig (Ref. AMM TASK 29-14-00-614-002).	On the air pressure gages: The pressure in the reservoirs increases to 50 psig.

5. Close-up
Subtask 29-14-00-860-051-B

A. Put the aircraft back to the serviceable condition.
(1) Close the ground connector and disconnect the ground air supply.
(2) Install the blanking cap on the ground connector.
(3) Remove the WARNING NOTICE(S).
(4) Make sure that the work area is clean and clear of tools and other items.
(5) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

Subtask 29-14-00-410-054-A

B. Close Access
(1) Close the right door of the main landing-gear (Ref. AMM TASK 32-12-00-410-001).
(2) Close the access doors 195BB 196BB 197CB 197EB 197FB 198CB.

Subtask 29-14-00-865-053-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
123VU	B HYD/ELEC PUMP	2701GJ	AB09
123VU	Y HYD/ELEC/PUMP	3802GX	AB06
123VU	Y HYD/ELEC/ELEC PUMP/NORM	3801GX	AB03

[Rev.10 from 2021] 2026.04.01 00:24:10 UTC