Pressurize the Yellow Hydraulic System with a Hydraulic Ground Power-Cart

TASK 29-10-00-863-002-A
Pressurize the Yellow Hydraulic System with a Hydraulic Ground Power-Cart

WARNING: OBEY THE HYDRAULIC SAFETY PROCEDURES.

WARNING: MAKE SURE THAT THE TRAVEL RANGES OF THE FLIGHT CONTROLS SURFACES ARE CLEAR. MOVEMENT OF FLIGHT CONTROLS CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.

WARNING: PRESSURIZE ONLY THE HYDRAULIC SYSTEM(S) THAT IS (ARE) NECESSARY FOR THE TASK. ISOLATE THE OTHER HYDRAULIC SYSTEM(S) BEFORE YOU SUPPLY HYDRAULIC POWER TO THE AIRCRAFT.

CAUTION: DO NOT CONNECT GROUND POWER SUPPLIES TO THE GREEN AND YELLOW HYDRAULIC SYSTEMS AT THE SAME TIME. THIS COULD CAUSE:

THE PTU TO OPERATE TOO FAST
DAMAGE TO THE PTU IF ONE GROUND POWER SUPPLY IS IN OPERATION AND THE OTHER IS IN THE BY-PASS MODE.

ZONE: 190

1. Reason for the Job
To pressurize the Yellow hydraulic system (with a ground power supply) for maintenance.
This procedure describes the pressurization of the Yellow hydraulic system with a ground power supply.
You can also pressurize the Yellow hydraulic system with the Yellow electric pump as given in the Task (Ref. 29-24-00-863-001-A).
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
ALT29000001	1	HYD GRND PWR UNIT3000

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
190	BELLY FAIR, AIR CONDITIONING & HYD COMPT
198CB

C. 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 29-10-00-864-002-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)
TASK 31-60-00-860-001-A	EIS Start Procedure
TASK 31-60-00-860-002-A	EIS Stop Procedure
Ground Connectors on Yellow Service Panel

3. Job Set-up
Subtask 29-10-00-010-051-A

A. Open the access door 198CB.

Subtask 29-10-00-860-080-A

B. Aircraft Maintenance Configuration

CAUTION: DO NOT START OR DRY MOTOR THE ENGINES WITH A HYDRAULIC GROUND POWER SUPPLY CONNECTED TO THE AIRCRAFT. IF YOU DO, YOU CAN CAUSE DAMAGE TO THE ENGINE PUMPS.

(1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
(2) Do the EIS start procedure (upper ECAM DU and lower ECAM DU only)
(Ref. AMM TASK 31-60-00-860-001).
(3) On the ECAM control panel on the center pedestal, push the HYD pushbutton switch (P/BSW). Make sure that the lower (system) display shows the HYD page.
(4) Make sure that the ECAM does not show these warnings:

Low air pressure in the Yellow reservoir
Low fluid level in the Yellow reservoir.

(5) Obey the subsequent caution:

CAUTION: DO NOT CONNECT GROUND POWER SUPPLIES TO THE GREEN AND YELLOW HYDRAULIC SYSTEMS AT THE SAME TIME. THIS COULD CAUSE:

THE PTU TO OPERATE TOO FAST
DAMAGE TO THE PTU IF ONE GROUND POWER SUPPLY IS IN OPERATION AND THE OTHER IS IN THE BY-PASS MODE.

(6) If you will pressurize the Green hydraulic system at the same time with the Yellow hydraulic system through the PTU, the ECAM must not show these warnings:

Low air pressure in the Green reservoir
Low fluid level in the Green reservoir.

(7) If necessary, pressurize the reservoirs (Ref. AMM TASK 29-14-00-614-002).
(8) If necessary, add fluid to the applicable reservoir (Ref. AMM TASK 12-12-29-611-001) or (Ref. AMM TASK 12-12-29-611-002).
(9) If it is not necessary to pressurize the Green system at the same time with the Yellow system:

NOTE: Usually the PTU automatically pressurizes the Yellow hydraulic system at the same time with the Green hydraulic system. If you pressurize the Yellow system only, then it is necessary to stop the operation of the PTU.

(a) On section 40VU of the overhead panel, push the PTU pushbutton switch. Make sure that the OFF legend comes on.
(b) Disconnect the PTU isolation coupling (Ref. AMM TASK 29-23-00-860-001).
(10) Depressurize the reservoir of the Yellow hydraulic system (Ref. AMM TASK 29-14-00-614-001).
(11) Connect the suction and delivery lines of the hydraulic ground power-supply to the aircraft ground connectors:

Ground Connectors on Yellow Service Panel

3006GM suction
3008GM delivery.

(12) Pressurize the reservoir of the Yellow hydraulic system (Ref. AMM TASK 29-14-00-614-002).

4. Procedure
Subtask 29-10-00-863-051-A

A. Pressurization of the Yellow Hydraulic System with the Ground Power Cart-Hydraulic
(1) Pressurize the Yellow hydraulic system:
(a) Make sure, that delivery pressure on the ALT29000001 HYD GRND PWR UNIT3000 is set to 0 psi (0 bar).
(b) Start the ALT29000001 HYD GRND PWR UNIT3000.
(c) In not less than 30 seconds, increase the pressure for the Yellow hydraulic system to 3000 psi (206.84 bar).

NOTE: If the PTU is not isolated obey the subsequent precautions to prevent damage to the PTU:

Make sure that the air pressure in the Yellow and the Green reservoirs does not fall below 3 bar (43.51 psi).
Limit the flow of the ground hydraulic supply to a MAX 119 l.min (31.4362 USgal.mn).

(2) Refer to the ECAM indication of the YELLOW system pressure and make sure it shows 3000 psi.

NOTE: If the PTU is not isolated, it pressurizes the Green system at the same time. Usually, the PTU pressurizes the system to a nominal pressure of 3000 psi, but if no consumers operate, the pressure is not constant. The PTU operates in a cycle which keeps the pressure in the Green system between 2400 and 3100 psi.

5. Close-up
Subtask 29-10-00-860-055-A

A. Put the aircraft back to the serviceable condition.
(1) Depressurize the Yellow hydraulic system (Ref. AMM TASK 29-10-00-864-002).
(2) Disconnect the hydraulic ground power-supply.
(3) On section 40VU of the overhead panel, push the PTU pushbutton switch. Make sure that the OFF legend goes off.
(4) Connect the PTU isolation coupling (Ref. AMM TASK 29-23-00-860-002).
(5) 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).
(6) If necessary, pressurize the reservoir of the Yellow hydraulic system (Ref. AMM TASK 29-14-00-614-002).
(7) Do the EIS stop procedure
(Ref. AMM TASK 31-60-00-860-002).
(8) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

Subtask 29-10-00-410-051-A

B. Close the access door 198CB.

[Rev.10 from 2021] 2026.04.01 00:13:44 UTC