Hydraulics

Question 1

How the AC hyd pup works when on AUTO?

Answer 1

In flight, with the selector knob set to AUTO position, the Hydraulic
System logic activates the electric pump in case of:
– EDP or engine fail, or
– Flaps selected to any position greater than 0°.
During landing operations, the Electric Hydraulic Pumps remain
activated for 60 seconds to avoid abrupt hydraulic pressure variations
in an event of engine failure.
On ground, with the selector knob set to AUTO position, the Hydraulic
System logic activates the electric pump in case of:
– Flaps selected to any position greater than 0° and:
– Thrust levers set to takeoff thrust, or
– Ground speed greater than 50 kt.
Also, during takeoff when thrust levers are set to TO/GA position, the
Electric Hydraulic Pumps will be activated for 60 s to avoid abrupt
hydraulic pressure variations in an event of engine failure.