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PRELIMINARY PAGES - TABLE OF CONTENTS
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A330/A340 FLEET DSC-29-PLP-TOC P 2/2
FCOM 19 AUG 10
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
HYDRAULIC
DESCRIPTION - GENERAL
A330/A340 FLEET DSC-29-10-10 P 1/2
FCOM 19 AUG 10
GENERAL
Applicable to: ALL
The aircraft has three, independent, continuously-operating hydraulic systems : GREEN, BLUE,
and YELLOW. Each system is supplied from its own hydraulic reservoir. Normal system operating
pressure is 3 000 PSI (2 500 PSI for RAT). There is no possibility to transfer hydraulic fluid from one
system to another.
The system is monitored by a Hydraulic System Monitoring Unit (HSMU).
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
HYDRAULIC
DESCRIPTION - GENERAL
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A330/A340 FLEET DSC-29-10-10 P 2/2
FCOM 19 AUG 10
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
HYDRAULIC
DESCRIPTION - GENERATION
A330/A340 FLEET DSC-29-10-20 P 1/12
FCOM 19 AUG 10
GREEN SYSTEM PUMPS
Applicable to:
Two pumps, driven by engines 1 and 4 pressurize the green system.
In addition, an electric pump which can be manually or automatically controlled can also pressurize
the green system.
The electric pump automatically runs :
in flight for 25 s in the event of failure of engine 1 or 4, when ‐ landing gear lever is selected up (to
ensure gear retraction in a proper time).
‐ on the ground when engines 1 and 4 are stopped and engines 2 and 3 are running (to provide
braking and nose wheel steering for taxi).
A pump, driven by a Ram Air Turbine (RAT), pressurizes the green system in the event of an
emergency.
When the RAT pressurizes the green system, the aileron, elevator, and spoiler servo control
operating speeds are reduced.
GREEN SYSTEM PUMPS
Applicable to: ,
Two pumps, respectively driven by each engine pressurize the green system.
In addition, an electric pump which can be manually or automatically controlled can also pressurize
the green system.
If one engine fails, the electric pump runs automatically in flight, for 25 s, when the landing gear lever
is selected up (to ensure gear retraction in a proper time).
A pump, driven by a Ram Air Turbine (RAT), pressurizes the green system in the event of an
emergency.
When the RAT pressurizes the green system, the aileron, elevator, and spoiler servo control
operating speeds are reduced.
BLUE SYSTEM PUMPS
Applicable to:
A pump, driven by Engine 2, pressurizes the blue system.
A manually-controlled electric pump can also pressurize the system.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
HYDRAULIC
DESCRIPTION - GENERATION
A330/A340 FLEET DSC-29-10-20 P 2/12
FCOM 19 AUG 10
BLUE SYSTEM PUMPS
Applicable to: ,
A pump, driven by Engine 1, pressurizes the blue system.
A manually-controlled electric pump can also pressurize the system.
In the event of an Engine 1 failure, in addition to a PRIM 1 or PRIM 3 loss : The BLUE ELEC
PUMP runs automatically in flight to ensure sufficient authority on the electrical rudder, thereby
counteracting the yaw sideslip induced by asymetrical thrust.
YELLOW SYSTEM PUMPS
Applicable to:
A pump, driven by Engine 3 pressurizes the yellow system.
In addition, an electric pump which can be manually or automatically controlled can also pressurize
the yellow system. This enables ground operations, when the engines are stopped.
The electric pump runs :
In flight, in the event of Engine 3 failure, if the FLAPS lever is not ‐ at 0 and aircraft speed is above
100 kt (to ensure flap retraction in a proper time at takeoff).
In this case, the pump runs continuously until last engine shut down.
‐ on the ground during cargo door operation.
Crewmembers can also use a hand pump to pressurize the yellow system, in order to operate the
cargo doors when no electrical power is available.
Note: On each system, the electric pump flow is about 18 % of the engine-driven pump flow
capacity. It can be used to retract the surfaces, but should not be used to replace the
engine-driven pumps.
YELLOW SYSTEM PUMPS
Applicable to: ,
A pump, driven by Engine 2 pressurizes the yellow system.
In addition, an electric pump which can be manually or automatically controlled can also pressurize
the yellow system. This enables ground operations, when the engines are stopped.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
HYDRAULIC
DESCRIPTION - GENERATION
A330/A340 FLEET DSC-29-10-20 P 3/12
FCOM 19 AUG 10
　
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