Hydraulics Flashcards
What is the normal system pressure of the hydraulic system?
3000 PSI
The Power Transfer Unit (PTU) automatically operates at what differential pressure between GREEN and YELLOW systems?
> 500 PSI
What system powers the normal brakes?
Green system
What is pressurised by the Ram Air Turbine (RAT)?
Blue system.
When does the RAT automatically deploy?
If AC BUS 1 and AC BUS 2 are lost
What does the PTU enable? .
The PTU enables the yellow system to pressurise the green system, and vice versa
Does the fire shut off valve cut off fluid upstream or downstream from the HYD pump?
Upstream so the pump is running dry
Can you disconnect the hydraulic pump from the engine
No
When is the PTU inhibited?
During the first engine start
Tested during the second engine start
Nose wheel steering bypass
During hand pump cargo door opening
How can crew pressurise the blue HYD sys without engine start?
BLUE PUMP OVRD pb on maintenance panel
Pressure using RAT?
2500psi
Under what conditions will the ENG 1(2) PUMP amber FAULT light, with ECAM caution appear?
The reservoir is low
The reservoir overheats
The reservoir air pressure is low
The pump pressure is low (inhibited on the ground when the Eng is off)
What happens to the YELLOW ELEC PUMP when crew open the cargo door (if AC PWR avail)
Pump turns on automatically
Inhibits the operation of other yellow system functions
(Except alternate braking and Eng 2 reverse)
