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Electric Hydraulic Pumps
The electric hydraulic pumps are controlled by the HSMU, in both automatic and manual operation. Only 1 electric pump runs at a time - the others are load shed.
On each system, electric pump flow is about 18% of engine-driven pump flow. Electric pumps can be used to retract surfaces, but are not a replacement for engine-driven pumps.
Green system
Has an automatically or manually controlled electric pump. Automatic operation:
- in the event of failure of one engine, when the landing gear lever is selected up (runs for 25s)
Manual operation:
- for the retraction of green actuated surfaces in case of loss of both engine driven pumps
Blue system
A330 basic
Has a manually controlled electric pump. Manual operation:
- can be used to pressurise the park brake
A330E
Has an automatically controlled electric pump. Automatic operation:
- in the event of failure of engine 1, and PRIM1 and PRIM3 faults - this provides backup for rudder operation (see backup control module)
Yellow system
Has an automatically or manually controlled electric pump. Automatic operation:
- in flight in the event of failure of engine 2 with the FLAPS lever not 0, if the green electric pump is not running - in this case, the pump will continue to run unless turned off manually
- on the ground during cargo door operation
Manual operation:
- if manually used, has to be switched off after flap retraction