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The HSMU inhibits the closure of the green, blue and yellow hydraulic leak measurement valves in
flight.
PRIORITY FUNCTION
Applicable to: ALL
In the event of low hydraulic pressure, a priority valve cuts off hydraulic power to heavy load users
(emergency generator, nosewheel steering, landing gear) in order to keep the pressure for normal
braking and flight controls.
A Pressure-Off Brake system (installed on the flaps, slats, and THS actuator) ensures the same
function.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
HYDRAULIC
DESCRIPTION - DISTRIBUTION
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FCOM 19 AUG 10
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
HYDRAULIC
CONTROLS AND INDICATORS
A330/A340 FLEET DSC-29-20 P 1/16
FCOM 19 AUG 10
OVERHEAD PANEL
Applicable to:
(1) ENG 1 (2, 3 or 4) PUMP pb sw (guarded)
On : The pump pressurizes the system, when the engine is running.
OFF : The pump is depressurized. Hydraulic power generation stops.
FAULT lt : This amber light and an associated ECAM caution come on, if :
‐ The reservoir level is low
‐ The reservoir overheats
‐ Reservoir air pressure in the reservoir is low
‐ The pump pressure is low (inhibited on ground, when the engine is
stopped).
This light goes off, when the crew selects OFF, except during an overheat.
(The light stays on, for as long as the overheat lasts).
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
HYDRAULIC
CONTROLS AND INDICATORS
A330/A340 FLEET DSC-29-20 P 2/16
FCOM 19 AUG 10
(2) GREEN (or YELLOW) ELEC PUMP pushbutton
AUTO : The HSMU automatically controls the pump :
‐ The green electric pump runs :
• For 25 s, in the event of an Engine 1 or 4 failure, when the landing
selector lever is selected up and the aircraft speed is above 100 kt.
• On ground, when Engines 1 and 4 are stopped, and Engines 2 and 3
are running.
‐ The yellow electric pump runs :
• In the event of an Engine 3 failure, if the FLAPS lever is not at zero
and the aircraft speed is above 100 kt. It remains running until the last
engine shutdown.
• On ground, when the lever of the cargo door manual selector valve
is set to the OPEN or CLOSE position. In this case, the yellow leak
measurement valve closes, and yellow flap motor operation is inhibited.
OFF : The pump is off.
FAULT lt : This amber light, and an associated ECAM caution come on, if :
‐ The reservoir level is low, or
‐ The reservoir overheats, or
‐ Air pressure in the reservoir is low, or
‐ The pump delivers low pressure (inhibited on the ground, when the
engines are stopped), or
‐ The pump overheats.
The light goes off when the crew selects OFF, except during an overheat. In
the case of a reservoir overheat, the fault light stays on, until the overheat
stops. In the case of an electrical pump overheat, the light stays on, even if
the overheat has stopped, and until the system is reset on ground.
Note: If the yellow/green electric pump overheats, the pump automatically
shuts down.
(3) GREEN (or YELLOW) ELEC PUMP ON pushbutton (springloaded-guarded)
AUTO : The electric pump is controlled by the applicable ELEC PUMP pushbutton.
ON : The electric pump is on, provided the ELEC PUMP pushbutton is not selected
OFF.
After an electrical power interruption, the pump does not restart (ON light stays
off).
The ON light comes on blue when the pump is manually or automatically supplied.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
HYDRAULIC
CONTROLS AND INDICATORS
A330/A340 FLEET DSC-29-20 P 3/16
FCOM 19 AUG 10
(4) BLUE ELEC PUMP pushbutton
Standby : The pump is controlled by the BLUE ELEC PUMP ON pushbutton.
OFF : The pump is off.
FAULT lt : The amber fault light comes on (provided the blue electrical pump is
running), along with an associated ECAM caution, if :
‐ The reservoir level is low, or
‐ Air pressure in the reservoir is low, or
‐ The reservoir overheats, or
‐ Pump pressure is low, or
‐ The pump overheats.
The light goes off when the crew selects OFF, except during an overheat.
In the case of a reservoir overheat, the fault light stays on until the overheat
stops. In the case of an electrical pump overheat, the light stays on, even if
the overheat has stopped, and until the system is reset on ground.
Note: If the blue electric pump overheats, the pump automatically shuts down.
(5) BLUE ELEC PUMP ON pushbutton (springloaded-guarded)
ON : The electric pump is on, provided the ELEC PUMP pushbutton is not selected
　
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