Hydraulic System Flashcards
What is the normal hydraulic system pressure?
3000 psi
What is the maximum hydraulic system pressure?
3000 +/- 200 psi
Which pumps supply pressure for the green hydraulic system?
ENG 1 hydraulic pump and the PTU
What happens to the green hydraulic system if the ENG 1 fire switch is released out?
It is pressurized by the PTU
Which pumps supply pressure for the blue hydraulic system?
Blue electric pump and the RAT
Which pumps supply pressure for the yellow hydraulic system?
ENG 2 hydraulic pump, PTU, and Yellow electric pump
Which items are completely lost with loss of the yellow hydraulic system?
No. 2 reverser and alternate brakes
What happens to the yellow hydraulic system if the ENG 2 fire switch is release out?
The PTU pressurizes the yellow system
Which hydraulic system pumps are running after #1 engine start?
Green and Blue
When is the PTU inhibited?
NW STRNG DISC message displayed and one engine master switch ON
The PTU is automatically activated when there is a ____ psi differential between the _____ and _____ hydraulic systems.
500, green, yellow
After cargo door operation, how long is the PTU inhibited?
40 seconds
With both ENG MASTER switches OFF and the yellow electric-driven hydraulic pump ON, the PTU will
Pressurizes the green hydraulic system.
In flight and ENG 1 or ENG 2 FAULT light, in addition to PTU FAULT light, is an indication of a hydraulic _______
problem.
Reservoir
Which device shuts off hydraulic power to the heavy users if system pressure drops below a predetermined value?
Priority valves
The RAT pressurizes the blue hydraulic system to ____________psi
2500 psi
The RAT can be deployed as an emergency means of pressurizing the _______ hydraulic system.
Blue
When will the RAT automatically extend?
Loss of AC busses 1 and 2 above 100 knots
What would cause the ENG PUMP FAULT light to remain illuminated even after turning the ENG PUMP switch OFF?
Reservoir overheat condition.
The cargo doors are normally operated by which pump?
Yellow electric pump
Which hydraulic systems have electric pumps?
Blue and Yellow
