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The electric pump runs automatically :
‐ in flight, in the event of Engine 2 failure, if the FLAPS lever is not at 0 (to ensure flap retraction in a
proper time at takeoff).
Note: In the event of an Engine 2 failure at takeoff, the yellow electric pump is automatically
controlled on, if the green electric pump is not running for landing gear retraction.
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.
RAM AIR TURBINE (RAT)
Applicable to:
A drop-out RAT, coupled to a hydraulic pump, allows the green system to function.
The RAT may be extended at any time by pressing the RAT MAN ON pushbutton.
The RAT deploys automatically in the event of four engine failure, or electrical power loss when
engines 1 and 4 are stopped (RAT required for EMER GEN operation), or when there is a low level
in the green and blue reservoirs. It can be manually deployed from the overhead panel. It can only be
stowed when the aircraft is on the ground.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
HYDRAULIC
DESCRIPTION - GENERATION
A330/A340 FLEET DSC-29-10-20 P 4/12
FCOM 19 AUG 10
Note: The RAT flow varies between 15 % and 45 % of an engine-driven pump flow capability,
depending on the aircraft’s speed.
RAM AIR TURBINE (RAT)
Applicable to: ,
A drop-out RAT, coupled to a hydraulic pump, allows the green system to function.
The RAT may be extended at any time by pressing the RAT MAN ON pushbutton.
The RAT deploys automatically in the event of both engine failure or a low level in the green and
yellow or green and blue reservoirs. It can be deployed manually from the overhead panel. It can
be manually deployed from the overhead panel. It can only be stowed when the aircraft is on the
ground.
Note: The RAT flow varies between 15 % and 45 % of an engine-driven pump flow capability,
depending on the aircraft’s speed.
SYSTEM ACCUMULATORS
Applicable to: ALL
An accumulator in each system helps maintain constant pressure by covering transient demands
during normal operation.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
HYDRAULIC
DESCRIPTION - GENERATION
A330/A340 FLEET DSC-29-10-20 P 5/12
FCOM 19 AUG 10
PRIORITY VALVES
Applicable to:
A priority valve cuts off hydraulic power to heavy load users if green system hydraulic pressure gets
low.
FIRE SHUTOFF VALVES
Applicable to:
The green, blue and yellow systems each have a fire shut-off valve upstream of their engine-driven
pump. The flight crew can close the valve by pushing the FIRE pushbutton.
The ENG 1 and ENG 4 fire shut-off valves are automatically closed by the HSMU, in the event of
green reservoir low level. In case of a further blue reservoir low level, the green fire shut-off valves
remain closed, enabling the green system to be restored by using the RAT. The flight crew cannot
re-open the fire shut-off valves in flight, once they have been automatically closed.
FIRE SHUTOFF VALVES
Applicable to: ,
A fire shutoff valve is positioned upstream of each engine driven pump. The flight crew can close the
valve by pushing the FIRE pushbutton.
Both engine green hydraulic fire shut-off valves are automatically closed by the HSMU, in the event
of a green reservoir low level. If the blue and yellow reservoir levels are normal, 150 s after the initial
closure of the fire shut-off valves, the green engine-driven pumps are automatically depressurized
and the fire shut-off valves are reopened to lubricate and avoid damage to the engine-driven pumps.
In case of a further blue or yellow reservoir low level, the green fire shut-off valves remain closed,
enabling the green system to be restored by using the RAT. The flight crew cannot re-open the fire
shut-off valves in flight, once they have been automatically closed.
FILTERS
Applicable to:
L3 Filters clean the hydraulic fluid as follows :
HP filters on each system and on the reservoir filling system ‐ and the normal braking system
‐ return line filters on each line
‐ case drain filters on engine pumps (which permit maintenance to monitor engine wear by
inspecting the filters for the presence of metallic particles).
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
HYDRAULIC
DESCRIPTION - GENERATION
A330/A340 FLEET DSC-29-10-20 P 6/12
　
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