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Electric Hydraulic Pumps
If an electric pump overheats, it automatically shuts down.
Green system
Has an automatically controlled electric pump. Automatic operation:
- in the event of failure of engines 1 or 4, when the landing gear lever is selected up with speed above 100 kts (runs for 25s) (assists gear retraction)
- on the ground with engines 1 and 4 stopped and engines 2 and 3 running (provide braking and nose wheel steering for taxi)
Blue system
Has a manually controlled electric pump. Manual operation:
- can be used to pressurise the park brake
Yellow system
Has an automatically controlled electric pump. Automatic operation:
- in flight in the event of failure of engine 3 with the FLAPS lever not 0 and speed above 100 kts, if the green electric pump is not running (assists flap retraction) - in this case, the pump will continue to run unless turned off manually
- on the ground during cargo door operation
Categories: Airbus A340 | Hydraulics | Electric Hydraulic Pumps