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LEAK MEASUREMENT VALVES.........................................................................................................................2/8
FILTERS..............................................................................................................................................................3/8
GENERATION.....................................................................................................................................................3/8
RESERVOIR PRESSURIZATION.......................................................................................................................3/8
INDICATIONS......................................................................................................................................................5/8
DSC-29-10-30 DISTRIBUTION
DISTRIBUTION................................................................................................................................................... 1/6
DSC-29-20 CONTROLS AND INDICATORS
OVERHEAD PANEL......................................................................................................................................... 1/10
MAINTENANCE PANEL................................................................................................................................... 3/10
ECAM HYD PAGE............................................................................................................................................4/10
DSC-29-30 WARNINGS AND CAUTIONS
WARNINGS AND CAUTIONS............................................................................................................................ 1/4
WARNINGS AND CAUTIONS .............................................................................................................................2/4
DSC-29-40 ELECTRICAL SUPPLY
BUS EQUIPMENT LIST......................................................................................................................................1/2
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
HYDRAULIC
PRELIMINARY PAGES - TABLE OF CONTENTS
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A318/A319/A320/A321 FLEET DSC-29-PLP-TOC P 2/2
FCOM 19 AUG 10
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
HYDRAULIC
DESCRIPTION - GENERAL
A318/A319/A320/A321 FLEET DSC-29-10-10 P 1/2
FCOM 19 AUG 10
GENERAL
Applicable to: ALL
The aircraft has three continuously operating hydraulic systems : blue, green, and yellow. Each
system has its own hydraulic reservoir. Normal system operating pressure is 3 000 PSI (2 500 PSI
when powered by the RAT). Hydraulic fluid cannot be transferred from one system to another.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
HYDRAULIC
DESCRIPTION - GENERAL
Intentionally left blank
A318/A319/A320/A321 FLEET DSC-29-10-10 P 2/2
FCOM 19 AUG 10
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
HYDRAULIC
DESCRIPTION - GENERATION
A318/A319/A320/A321 FLEET DSC-29-10-20 P 1/8
FCOM 19 AUG 10
GREEN SYSTEM PUMP
Applicable to: ALL
A pump driven by engine 1 pressurizes the green system.
BLUE SYSTEM PUMPS
Applicable to: ALL
An electric pump pressurizes the blue system. A pump driven by a ram air turbine (RAT) pressurizes
this system in an emergency.
YELLOW SYSTEM PUMPS
Applicable to: ALL
A pump driven by engine 2 pressurizes the yellow system.
An electric pump can also pressurize the yellow system, which allows yellow hydraulics to be used
on the ground when the engines are stopped.
Crew members can also use a hand pump to pressurize the yellow system in order to operate the
cargo doors when no electrical power is available.
POWER TRANSFER UNIT (PTU)
Applicable to: ALL
A bidirectional power transfer unit enables the yellow system to pressurize the green system and vice
versa.
The power transfer unit comes into action automatically when the differential pressure between the
green and the yellow systems is greater than 500 PSI.
The PTU therefore allows the green system to be pressurized on the ground when the engines are
stopped.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
HYDRAULIC
DESCRIPTION - GENERATION
A318/A319/A320/A321 FLEET DSC-29-10-20 P 2/8
FCOM 19 AUG 10
RAM AIR TURBINE (RAT)
Applicable to: ALL
A drop-out RAT coupled to a hydraulic pump allows the blue system to function if electrical power is
lost or both engines fail. The RAT deploys automatically if AC BUS 1 and AC BUS 2 are both lost. It
can be deployed manually from the overhead panel. It can be stowed only when the aircraft is on the
　
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