ELECTRIC PUMPS
A320 ELECTRIC PUMPS 
The blue electric pump will operate and pressurize the blue system on the ground if the switch is in AUTO, at least one engine is running and AC power is available. The pump can also be operated on the ground by pressing the BLUE PUMP OVRD switch on the overhead maintenance panel. The pump runs continuously in flight, unless the ELEC PUMP switch is OFF.
The yellow electric pump will start automatically, regardless of switch position, when the cargo doors are operated. If there is a power interruption during cargo door operations, the pump is de-energized until its switch is cycled. During cargo door operations, all other yellow system users are inhibited except, number 2 reverser and the brake accumulator. A yellow system hand pump can be used to operate the cargo doors if there is no electrical power available.
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