HYDRAULIC
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PUSH IN: Closes the hydraulic shutoff valve (SOV), isolating the respective engine driven pump (EDP) from the associated hydraulic system.
PUSH OUT: Normal position.
OFF: Turns the respective pump off.
AUTO: Back-up for the respective EDP.
In flight: Activates in case of
EDP or engine fail, or
Flaps selected > 0.
On ground: Activates in case of flaps selected >0, and
TL set to takeoff thrust, or
Groundspeed > 50 kts.
ON: Pump operates continuously, overriding system logic.
Note: ELEC PUMP 2 in AUTO: If engine 1 running and parking brake released pump turns on (Single engine taxi logic).
OFF: PTU is turned off.
AUTO: Allows the PTU to operate automatically, according to hydraulic system logic.
ON: Operates continuously, overriding system logic.
OFF: Turns the respective electrical pump off.
ON: Turns the respective electrical pump on. 3B overrides system logic.
AUTO (3B): Turns 3B on automatically if AC Electric Pump 3A fails.
The PTU does not work on the ground.
Note: HYDRAULIC SYSTEM 3A pump is powered by the AC ESS BUS (Electrical Emergency).
