Hydraulic power systems Flashcards

1
Q

What systems require hydraulic pressure?

A

Landing Gear, Wheel Brakes, Pusher, Rudder Boost, Spoiler/Speed Brakes.

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2
Q

What provides variable flow and pressure to the hydraulic system? And at what rate?

A

Two engine-driven hydraulic pumps at 3000psi (located on the accessory gear box of each engine).

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3
Q

In case of a hydraulic pump malfunction, what prevents rotation without interfering with the continued operation of the engine?

A

The hydraulic pump connecting shaft to the AGB has a recess designed to work as shaft shear point if the torque imposed by the hydraulic pump to the AGB exceeds limits.

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4
Q

What is the function of the Priority Valve?

A

It guarantees hydraulic power to the spoilers, stick pusher, rudder spring actuator or brakes by restricting the flow to the landing gear, if being used simultaneously.

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5
Q

What encases the hydraulic fluid?

A

A (spring-biased bootstrap diaphragm type) reservoir.
(50psi reservoir pressure, 3000psi system pressure)

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6
Q

How much can the hydraulic reservoir hold?

A

Maximum 1.3 gals.

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7
Q

What provides contamination protection for the system?

A

Two disposable filter elements located on the lower portion of the manifold
(one for low pressure return and one for the high pressure line; the filter can capture any particle greater than 5 microns).

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8
Q

What would happen if the filter fails or is blocked by too much contamination?

A

A bypass valve will open to allow continued flow though the hydraulic system.

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9
Q

What is available to indicate that the filters need to be replaced?

A

The filters have red “pop-up” differential pressure indicators to provide a visual indication when the filters need to be replaced.

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10
Q

How are the Fire Shutoff Valves closed?

A

Manually by the engine fire extinguisher shutoff buttons, automatically in case of hydraulic system high temperature, or through the shutoff switches on the hydraulic panel.

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11
Q

What does a “HYD HI TEMP” CAS message indicate?

A

The hydraulic fluid temp has risen (to above 235+/- 7F) and both FSOV automatically close.

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12
Q

What does a “HYD LO PRES” CAS message indicate?

A

The system is not capable of providing flow at rated pressure

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13
Q

What does a “HYD SOV ½ FAIL” CAS message indicate?

A

A Fire Shut Off Valve (FSOV) was commanded to close and did not close.
(or a FSOV position does not agree with its switch position).

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