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The aircraft has three continuously operating hydraulic systems : blue, green, and yellow.
Each system has its own hydraulic reservoir. Normal system operating pressure is 3000
PSI (2500 PSI when powered by the RAT). Hydraulic fluid cannot be transferred from one
system to another.
GREEN SYSTEM PUMP
A pump driven by engine 1 pressurizes the green system
BLUE SYSTEM PUMPS
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
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)
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.
(.)  THE PTU FUNCTIONING IS
      AFTER THE END OF CARGO
KEPT  INHIBITED  40  SECONDS
DOOR OPERATION.
Y Pur4P PB OFF
CARGO DOOR OPER (*)
CCM ALL
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┃                                ┃                            ┃1.29.10     P 2       ┃
┃                                ┃                            ┣━━━━━┳━━━━━┫
┃I  -~ A318                      ┃I           HYDDESCRIPTION  ┃SEQ 100 1 ┃I REV 23  ┃
┃  .,,,.8, ,, ~L,~ A319          ┃                            ┃          ┃          ┃
┃ Lli,~ A320                     ┃                            ┃          ┃          ┃
┃      A~7-~'M" A321             ┃                            ┃          ┃          ┃
┃   FLIGHT CREW OPERATING MANUAL ┃                            ┃          ┃          ┃
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RAM AIR TURBINE (RAT)
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 ground.
SYSTEM ACCUMULATORS
An accumulator in each system helps to maintain a constant pressure by covering transient
demands during normal operation.
PRIORITY VALVES
Priority valves cut off hydraulic power to heavy load users if hydraulic pressure in a system
　
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本文鏈接地址：AIRBUS A320 Flight Crew Operating Manual3(149)