LEVEL I - ATA 29 Hydraulic Power

A380 TECHNICAL TRAINING MANUAL MANUAL MAINTENANCE COURSE - T1 & T2 (RR / Metric) LEVEL I - ATA 29 Hydraulic Power

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A380 TECHNICAL TRAINING MANUAL

LEVEL I - AT ATA 29 HYDRAULIC POWER Hydraulic Power System Introduction (1) . . . . . . . . . . . . . . . . . . . . . . 2 Hydraulic Power System Presentation (1) . . . . . . . . . . . . . . . . . . . . . . 6 Hydraulic Power System Maintenance (1) . . . . . . . . . . . . . . . . . . . . . 16

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MAINTENANCE COURSE - T1 & T2 (RR / Metric) LEVEL I - ATA 29 Hydraulic Power

TABLE OF CONTENTS

Apr 21, 2006 Page 1


HYDRAULIC POWER SYSTEM INTRODUCTION (1) General The hydraulic power system comprises: - a main hydraulic power generation, - a backup hydraulic power generation supplied by electrical power, - an auxiliary hydraulic power generation.

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HYDRAULIC POWER SY ST STEM INTRODU CT CTION (1 (1)

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HYDRAULIC POWER SYSTEM INTRODUCTION (1) Architecture In normal operation the two hydraulic circuits, green and yellow, are pressurized at 5000 PSI by engine pumps. These two hydraulic circuits supply the flight controls and landing gear system. As a backup local electro-hydraulic power generation is powered by electrical sources. They supply power for: - the flight controls through the Electro-Hydrostatic Actuators (EHA) and Electrical Backup Hydraulic Actuators (EBHA), - the braking and Nose Wheel Steering (NWS) system through Local Electro-hydraulic Generation Systems (LEHGS). Electric pumps supply auxiliary hydraulic power generation for maintenance operation and cargo door operation.

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HYDRAULIC POWER SYSTEM S YSTEM PRESENT PR ESENTA ATION (1) (1 ) General The A380 hydraulic power is generated by two fully independent hydraulic circuits, green and yellow, which are normally pressurized at 5000 PSI. The two circuits operate simultaneously, with no fluid transfer between them. As a backup local electro-hydraulic generation is powered by electrical sources.

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HYDRAULIC PO POWER SY SYSTEM PRESENTATION (1 (1)

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HYDRAULIC POWER SYSTEM S YSTEM PRESENT PR ESENTA ATION (1) (1 ) Hydraulic power system architecture architecture The hydraulic power system comprises: - main hydraulic power generation, - backup hydraulic power generation supplied by electrical power, - auxiliary hydraulic power generation.

Main Hydraulic Power Generation The green and yellow hydraulic circuits are fully independent. The hydraulic circuits are pressurized at 5000 PSI in normal operation by four Engine Driven Pumps (EDPs) in each circuit. Each circuit has a single hydraulic reservoir (RSVR). There are two EDPs per engine, each engine has one Fire Shut Off Valve (FSOV) to supply hydraulic fluid t o both EDPs on th at engine. The green and yellow circuits generate hydraulic power to operate: - the primary Flight Controls (F/CTL), - the secondary flight controls, - the landing gear, - the braking and steering system.

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HYDRAULIC POWER SYSTEM ARCHITECTURE - MAIN HYDRAULIC POWER GENERATION 1

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HYDRAULIC POWER SYSTEM S YSTEM PRESENT PR ESENTA ATION (1) (1 ) Hydraulic power system architecture architecture (continued) Backup Hydraulic Power Generation As a back-up to the normal hydraulic circuits, hydraulic pressure can be locally produced for the flight controls and landing gear using local electro-hydraulic power generators. The local electro-hydraulic generation system comprises: - EHA (Electro-Hydrostatic Actuator) and EBHA (Electrical Backup Hydraulic Actuator) to operate primary flight controls, - LEHGS (Local Electro-Hydraulic Generation System) to operate braking and steering systems.

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HYDRAULIC POWER SYSTEM ARCHITECTURE - BACKUP HYDRAULIC POWER GENERA GENERATION TION 1

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HYDRAULIC POWER SYSTEM S YSTEM PRESENT PR ESENTA ATION (1) (1 ) Hydraulic power system architecture architecture (continued) Auxiliary Hydraulic Power Generation On the ground, with all engines shut down, each hydraulic circuit can be pressurized by two Electric Motor Pumps (EMPs). For the cargo doors operation, one of the EMPs in the green system operates to generate hydraulic power. An isolation valve closes to isolate the main hydraulic users from the cargo doors hydraulic circuit. A similar isolation valve is fitted to the yellow circuit for the body gear steering system (not shown) which can be pressurized by the yellow EMPs. A manually operated backup auxiliary hydraulic pump can be used to operate the cargo doors. Hydraulic pressure can also be supplied to the green and yellow circuits via ground connections.

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HYDRAULIC POWER SYSTEM ARCHITECTURE - AUXILIARY AUXILIARY HYDRAULIC POWER GENERA GENERATION TION 1

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HYDRAULIC POWER SYSTEM S YSTEM PRESENT PR ESENTA ATION (1) (1 ) Control And Indicating Each hydraulic circuit reservoir supplies their respective EDPs through the FSOV that isolates the engine from the hydraulic circuit in case of fire.The valves are controlled by fire handles located on the cockpit overhead engine FIRE panel. Each EDP can be controlled ON or OFF through its respective P/BSW located on the HYDraulic cockpit control panel. Both EDPs on each engine can be declutched through a P/BSW located on the cockpit hydraulic control panel. On ground for maintenance operation, each EMP can be controlled ON or OFF t hrough its respective P/BSW located on the GrouND HYDraulic maintenance cockpit panel.

Monitoring Two Hydraulic System Monitoring Units (HSMUs), one for each hydraulic circuit, control and monitor the green and yellow hydraulic circuits respectively. They also give indication on the Control and Display System (CDS).

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CONTROL AND INDICATING - MONITORING 1

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HYDRAULIC POWER SYSTEM MAINTENANCE (1) Hydraulic Power System Safety Items

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When you work on the hydraulic power system, make sure that you obey all the AMM safety precautions. This will prevent injury to persons and/or damage to the aircraft. Here is an overview of main safety precautions relative to the hydraulic power system. As the green and yellow hydraulic systems are similar, the diagrams refer to only one hydraulic power system, the yellow system. Pay attention to the status of the hydraulic power system and its users in case they are pressurized. Make sure that all the safety devices and all the warning notices are in position, before any maintenance operations are performed. When disconnecting any Hydraulic line and component, all pumps must be switched off and the hydraulic reservoir must be depressurized to prevent fluid loss and personal injury. When opening the manual depressurization valve of the reservoirs protect your hands and face from the gas, as there could be a risk of: - Burns from hot pressurized gas, - Contamination from hydraulic fluid contained in the gas. Suitable protective clothing must be worn when working with hydraulic fluid, such as rubber gloves and safety goggles. Do not get hydraulic fluid on your skin, in your eyes or in your mouth. Hydraulic fluid is poisonous and can go through your skin and into your body. The Local Electro-Hydraulic Generation System (LEHGS) weighs approximately 120 pounds. If incorrect procedures are used during removal or installation, injury to persons, or damage to the LEHGS can occur. By consequence, the LEHGS removal/installation tasks require specific tooling that must be used. 1 6 1 6 0 W 1 L


HYDRAULIC POWER SYSTEM MA IN INTENAN CE CE (1)

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HYDRAULIC POWER SYSTEM MAINTENANCE (1) Hydraulic Power System Ground Support Equipment Some hydraulic power system maintenance tasks require Ground Support Equipment (GSE). As an example, during the LEHGS Removal/Installation, a specific GSE is used to hold this heavy component. Refer to the Aircraft Maintenance Manual (AMM) for the tasks. Also, refer to the illustrated Tool and Equipment Manual (TEM) for the complete list of the tools.

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AIRBUS S.A.S. 31707 BLAGNAC cedex, FRANCE STM REFERENCE L1W06161 APRIL 2006 PRINTED IN FRANCE AIRBUS S.A.S. 2006 ALL RIGHTS RESERVED AN EADS JOINT COMPANY WITH BAE SYSTEMS

LEVEL I - ATA 29 Hydraulic Power

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