Hydraulics

Question 1

Where is the AUX system reservoir located?

Answer 1

In the left system reservoir

Question 2

Which hydraulic system/s can operate the HMG?

Answer 2

Left and PTU

Question 3

Which hydraulic system/s are capable of providing hydraulic power to extend and retract the landing gear in flight?

Answer 3

Left and PTU

Question 4

With a dual hydraulic failure and only the AUX system fluid in the left hydraulic reservoir, what can the AUX hydraulic pump power?

Answer 4

Flaps, nose wheel steering, yaw damper 1, and rudder

Question 5

How is the hydraulic fluid used during opening of the main entrance door?

Answer 5

Hydraulic fluid flowing out of the door system at a controlled rate slows opening of the door

Question 6

How many hydraulic differential pressure indicators (DPI,s) are on the aircraft?

Answer 6

5 for the left system
3 for the right system
1 on the PTU
1 on the AUX

Question 7

What is the capacity of the hydraulic replenisher tank?

Answer 7

1.5 gallons

Question 8

What is the max reservoir quantity of the left hydraulic system?

Answer 8

4.8 gallons

Question 9

What is the max reservoir quantity of the right hydraulic system?

Answer 9

1.6 gallons

Question 10

What is the pre charge pressure of the hydraulic accumulators with both systems unpressurized?

Answer 10

1200psi

Question 11

What activates the PTU when it is armed?

Answer 11

If the left hydraulic pressure drops below 1500 psi with at least 1.5 gallons of fluid in the left system.

Question 12

What will cause the PTU to shut off automatically

Answer 12

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)

Question 13

If the PTU shuts off due to over heat, can it be turned on?

Answer 13

Yes, you can hard select or override.

Question 14

What does the PTU power?

Answer 14

Everything the left system powers, minus left thrust reverser and the primary flight controls

Question 15

Hat is the flow rate of the AUX pump

Answer 15

2 gallons per min at 3000psi

Question 16

Will the AUX PUMP turn OFF automatically with an amber AUX Hydraulic Hot CAS message?

Answer 16

No, it must be manually selected off

Question 17

What does the aux suction “boost” pump do?

Answer 17

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

Question 18

When ARMed, when will the AUX pump automatically turn on?

Answer 18

When the toe brakes are depressed and the Left hydraulic system is below 1500psi

Question 19

What will cause the PTU to automatically come on, when ARMed?

Answer 19

When the pressure drops below 1500psi in the left hydraulic system