Hydraulics Flashcards
Where is the AUX system reservoir located?
In the left system reservoir
Which hydraulic system/s can operate the HMG?
Left and PTU
Which hydraulic system/s are capable of providing hydraulic power to extend and retract the landing gear in flight?
Left and PTU
With a dual hydraulic failure and only the AUX system fluid in the left hydraulic reservoir, what can the AUX hydraulic pump power?
Flaps, nose wheel steering, yaw damper 1, and rudder
How is the hydraulic fluid used during opening of the main entrance door?
Hydraulic fluid flowing out of the door system at a controlled rate slows opening of the door
How many hydraulic differential pressure indicators (DPI,s) are on the aircraft?
5 for the left system
3 for the right system
1 on the PTU
1 on the AUX
What is the capacity of the hydraulic replenisher tank?
1.5 gallons
What is the max reservoir quantity of the left hydraulic system?
4.8 gallons
What is the max reservoir quantity of the right hydraulic system?
1.6 gallons
What is the pre charge pressure of the hydraulic accumulators with both systems unpressurized?
1200psi
What activates the PTU when it is armed?
If the left hydraulic pressure drops below 1500 psi with at least 1.5 gallons of fluid in the left system.
What will cause the PTU to shut off automatically
If left hydraulic pressure is restored
Loss of fluid in the left or right hydraulic system
A right Hydraulic Reservoir Hot CAS message ( > 104°C)
If the PTU shuts off due to over heat, can it be turned on?
Yes, you can hard select or override.
What does the PTU power?
Everything the left system powers, minus left thrust reverser and the primary flight controls
Hat is the flow rate of the AUX pump
2 gallons per min at 3000psi
Will the AUX PUMP turn OFF automatically with an amber AUX Hydraulic Hot CAS message?
No, it must be manually selected off
What does the aux suction “boost” pump do?
It provides a pressure boost to the AUX PUMP whenever the reservoir pressure drops below 20psi and shut off when the pressure goes above 25psi
When ARMed, when will the AUX pump automatically turn on?
When the toe brakes are depressed and the Left hydraulic system is below 1500psi
What will cause the PTU to automatically come on, when ARMed?
When the pressure drops below 1500psi in the left hydraulic system
