a380-Level II - Ata 29 Hydraulic Power

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

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A380 TECHNICAL TRAINING MANUAL

LEVEL II - AT ATA 29 HYDRAULIC POWER Hydraulic Power Description (2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Hydraulic Hydraulic System Operation, Operation, Control & Indicating Indicating (2) . . . . . . . . . . 22 Hydraulic Hydraulic Power Power System Component Component Location Location (2) . . . . . . . . . . . . . . 48

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

TABLE OF CONTENTS

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HYDRAULIC POWER DESCRIPTION (2) System Pressurization System Pressurization Architecture Architecture

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The two fully independent hydraulic systems operate simultaneously and are pressurized at 5000 PSI. In normal operation, each hydraulic system is pressurized by its own Engine Driven Pumps (EDPs) (two per Engine). On ground only, and with the engines off, the Electro Motor Pumps are used to pressurize the system for the cargo doors (green circuit) or the body wheel steering (yellow circuit) operation, or for maintenance operations. Each hydraulic system is managed by a Hydraulic System Monitoring Unit (HSMU). The HSMU provides local warnings on the overhead panel and indications on the Display Units (DUs). They are fully independent and are supplied by DC BUS. Each Electro Motor Pump is supplied by AC BUS. One Electro Motor Pump is supplied by AC Ground Service BUS to provide cargo doors operation. A pressure transmitter is used to monitor system pressure status and is connected to the HSMU. The pressure information is shown on the HYD ECAM page and on the Ground Service Panel (GSP) via pressure indicators. A pressure switch (one per pump) detects a pressure drop of the related pump. They send a low-pressure signal to the HSMU when the pressure decreases and the signal disappears when the pressure rises. 9 2 M L 0 T 0 T D 0 L 2 8 0 6 0 Y 0 L


HYDRAULIC POWER DESCRIPTION (2)

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SYSTEM PRESSURIZATION - SYSTEM PRESSURIZA PRESSURIZATION TION ARCHITECTURE 0

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HYDRAULIC POWER DESCRIPTION (2) System Pressurization (continued) Pressurization From Ground Power Unit Ground Power Units (GPUs) through Ground Connectors can be used to pressurize the HYD systems for maintenance operations.




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HYDRAULIC POWER DESCRIPTION (2) System Servicing Accumulator One power accumulator on each circuit is connected t o the HP circuit upstream the HP belly fairing manifold. The Power Accumulator is a metal bellow accumulator which is factory gas pre-charged with Helium. Servicing is done in shop only.




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HYDRAULIC POWER DESCRIPTION (2) System Servicing (continued) Reservoir Pressurization/Depressurization Pressurization/Depressurization

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Each hydraulic reservoir can be pressurized by three different sources: - Engine HP, - Pneumatic system, - GSP. The reservoirs supply hydraulic fluid to the EDPs, the Electro Motor Pumps and the cargo door auxiliary pump. The reservoir nominal pressure is 65 PSI (4,1bars). Each reservoir has a pressure relief valve that evacuates air or liquids in case of fluid overflow or overpressure. A pressure switch monitors the reservoir pressure and triggers a warning in case of low pressure. Air pressure value can be read on the reservoir itself via a direct reading gage or on the GSP. For GSP indicators, the air pressure is transmitted from the RSVR pressure transducer via the HSMU to the gage. On the GSP, an air depressurization switch can be manually activated for maintenance and a reservoir air pressurization valve is used to pressurize both hydraulic reservoirs from a ground servicing unit through ground connectors. E

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WARNI ARNING NG:: When using the depress switch, air pressure containing fluid vapors is released from the tank to the rear part of the outer engine pylon. Due to the size of the A/C, this area is not visible from the GSP only a visual check of the area will allow you to make sure the area is clear. 0

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SYSTEM SERVICING - RESERV RESERVOIR OIR PRESSURIZA PRESSURIZATION/DEPRESSURIZA TION/DEPRESSURIZATION TION 0

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HYDRAULIC POWER DESCRIPTION (2) System Servicing (continued) Reservoir Level Check and Refilling

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The main components of the reservoir filling system are installed on the GSP: - filling selector valve which is used to select manually the reservoir to be filled, - filling level gage which indicates the fluid level of the selected reservoir, - ground self sealing coupling which lets perform the reservoir filling from a ground hydraulic card, - filling hand pump, with its handle and a flexible hose, can be used to manually fill the hydraulic reservoirs from a HYD can, - filling filter to protect the hydraulic systems from pollution. A level transmitter and a low level switch are used to detect the reservoir low level. On each reservoir, a sight glass is used when the aircraft is not powered. In addition, the HSMU is connected to the Onboard Maintenance System (OMS) for servicing report shown on the Onboard Maintenance Terminal (OMT). The reservoirs fluid quantities and the hydraulic systems pressures are shown on the ECAM. There are two filling possibilities: - from a hydraulic ground cart connected to the coupling socket, - from a hydraulic fluid container using the A/C hand pump. When filling from a hydraulic ground cart, a restrictor prevents overpressure. When no electrical power is available, refilling is possible by using the A/C hand pump. Hydraulic reservoirs are filled from the GSP, through the hydraulic system return lines. L



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SYSTEM SERVICING - RESERVOIR LEVEL CHECK AND REFILLING 0

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HYDRAULIC POWER DESCRIPTION (2) System Servicing (continued) Check Of Filters And Fluid Sampling Several filters are installed in the hydraulic system. Each HP, HP, return and case drain filters has an electrical and mechanical clogging indicators (Differential Pressure Indicators). The return filters incorporate a bypass device. On the GSP, the reservoir filling filter has a mechanical clogging indicator and is not electrically monitored. The filter clogging status is displayed on the OMS via the HSMU. A sampling valve is installed on the HP belly fairing manifold. It makes it possible to take samples of fluid from the system (pressurized or not) for analysis.




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SYSTEM SERVICING - CHECK OF FILTERS AND FLUID SAMPLING 0

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HYDRAULIC POWER DESCRIPTION (2) System Servicing (continued) Leak Draining Some tanks are installed to collect fluid leaks from: - each Electro Motor Pump, - each Hydraulic/Air heat exchangers. - slat and flap Power Control Units (PCUs). CAUTIO CAUTION: N: When draining draining the tanks, fluid spillage spillage on the components/panels in the vicinity can occur. This fluid is likely to have corrosive effects on a long term period, therefore in case of spillage, cleaning will prevent these corrosive effects.




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HYDRAULIC SYSTEM OPERATION, CONTROL & INDICATING (2) General

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HYDRAULIC SYSTEM OPERATION, CONTROL & INDICA INDICATING TING (2)

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HYDRAULIC SYSTEM OPERATION, CONTROL & INDICATING (2) EMP Manual System Pressurization EMP Controls




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HYDRAULIC SYSTEM OPERATION, CONTROL & INDICATING (2) EMP Manual System Pressurization (continued) EMP Indication




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HYDRAULIC SYSTEM OPERATION, CONTROL & INDICATING (2) EMP Manual System Pressurization (continued) System Pressure Status Indication




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HYDRAULIC SYSTEM OPERATION, CONTROL & INDICATING (2) EMP Manual System Pressurization (continued) Reservoir Quantity Indication WARNI ARNING NG:: When the reservoir temperature is not available, the fill reference point indication is steady. It shall not be used as a target level. Risk of over/underfill.




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HYDRAULIC SYSTEM OPERATION, CONTROL & INDICATING (2) EMP AUTO Operation




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HYDRAULIC SYSTEM OPERATION, CONTROL & INDICATING (2) System Servicing Accumulator Reservoir Pressurization WARNI ARNING NG:: HF point: Remote location of outlet pipe




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HYDRAULIC SYSTEM OPERATION, CONTROL & INDICATING (2) System Servicing (continued) Reservoir Refilling




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HYDRAULIC SYSTEM OPERATION, CONTROL & INDICATING (2) System Servicing (continued) System Filters




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HYDRAULIC POWER SYSTEM COMPONENT LOCATION (2) Outer Pylon Flap Track 5 Inner Pylon Ground Service Panel

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HYDR HY DRA AUL ULIC IC POW POWER ER SYS SYSTE TEM M COMP COMPONE ONENT NT LOC LOCA ATI TION ON (2) (2)

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HYDR HY DRA AUL ULIC IC POW POWER ER SYS SYSTE TEM M COMP COMPONE ONENT NT LOC LOCA ATI TION ON (2) (2)

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AIRBUS S.A.S. 31707 BLAGNAC cedex, FRANCE STM REFERENCE L0Y06082 MARCH 2006 PRINTED IN FRANCE AIRBUS S.A.S. 2006 ALL RIGHTS RESERVED AN EADS JOINT COMPANY WITH BAE SYSTEMS

a380-Level II - Ata 29 Hydraulic Power

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