Section 13 - Hydraulics

Question 1

With a dual hydraulic system failure, what is the recommended maximum operating airspeed and altitude?

Answer 1

250 KCAS, 25,000 feet

Question 2

If the utility hydraulic pump is ARMED, what will cause it to automatically turn ON?

Answer 2

A failure of the combined hydraulic system (pressure drop below 800 psi)

Question 3

Following a failure of the combined hydraulic system pump, with the utility pump switch in the ARMED position and the utility system operating, illumination of a blue “FLT HYD HOT” CAS message would cause what to happen?

Answer 3

Utility hydraulic system pressure would decrease to zero (the pump will not operate)

Question 4

What hydraulic systems can provide braking with anti-skid protection?

Answer 4

Combined, utility, auxiliary

Question 5

Where is the AUX system reservoir located?

Answer 5

In the combined system reservoir

Question 6

Which hydraulic system{s) can operate the HMG?

Answer 6

Combined system only

Question 7

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

Answer 7

Combined and utility systems

Question 8

With a dual hydraulic failure, and only the AUX system fluid in the left hydraulic reservoir, which components can the auxiliary hydraulic pump operate?

Answer 8

The aux pump can power the flaps and brakes

Question 9

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

Answer 9

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

Question 10

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

Answer 10

1200 psi @ 70° f (21 °C)

Question 11

If the utility pump shuts off due to an overheat condition, can it be turned ON?

Answer 11

Yes, it can be hard-selected ON

Question 12

What does the utility pump power?

Answer 12

Everything that the combined hydraulic system powers, except the left thrust reverser, primary flight controls, and the HMG

Question 13

What does the auxiliary hydraulic pump power?

Answer 13

1. Closes the main cabin door 2. Opens and closes the landing gear doors Brakes 3. Flaps 4. Ground spoiler servo signal 5. Parking brake accumulator pressure

Question 14

Will the auxiliary hydraulic pump turn OFF with an amber “AUX HYDRAULIC HOT” CAS message?

Answer 14

No

Question 15

What components are lost with a failure of the combined hydraulic system pump?

Answer 15

The left thrust reverser and HMG

Question 16

What components are lost with a loss of the combined hydraulic system fluid?

Answer 16

Left thrust reverser, HMG, nose wheel steering, stall barrier system

Question 17

What components are lost with a failure of the flight hydraulic system pump or the flight hydraulic system fluid?

Answer 17

Right thrust reverser, yaw damper

Question 18

Where can you find information concerning approved hydraulic fluids?

Answer 18

In the AFM, Section 1 (Limitations), or the QRH, Supplemental Data