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EDV Systems > Hydraulic > Flashcards

Hydraulic Flashcards

1
Q

What systems do are the hydraulics responsible for?

A

Flight controls, landing gear, brakes.

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2
Q

How are hydraulic systems 1 and 2 cooled?

A

A shared air/fluid heat exchanger. No fluid exchanges occurs within the heat exchanger.

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3
Q

Why doesn’t hydraulic system 3 require any cooling?

A

The components for system 3 do not pass near any heat sources that would require extra cooling.

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4
Q

Hydraulic SOVs can be closed by selecting the respective ____ switchlight or the ____ switchlights.

A

ENG FIRE PUSH or HYD 1/2 SOV

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5
Q

Hydraulic pump ____ will continue to operate regardless of switch position following ___ deployment.

A

3B
ADG deployment

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6
Q

What is the name of the fluid found in the hydraulic lines?

A

SKYDROL

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7
Q

How many hydraulic pumps are there are the CRJ 900? Describe them:

A

6 pumps; 3 primary 3 backup.

Systems 1 and 2 A pumps are engine driven, the rest are electric pumps.

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8
Q

Arrange the hydraulic systems in terms of size from largest to smallest.

A

3 largest
2 med
1 smallest

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9
Q

What components would you lose if you lost hydraulic system 1? (Use synoptic page)

A

OB Multi function spoiler(spoileron/flt spoiler), OB Ground spoiler, L reverser.

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10
Q

What components would you lose if you lost Hydraulic system 2? (Use synoptic page)

A

IB Multi function spoiler (spoileron/flt spoiler), LG Alternate Extension, R reverser, OB Brakes.

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11
Q

What components would you lose if you lost hydraulic system 3? (Use synoptic page)

A

IB Ground spoiler, Landing gear extension, Nosewheel steering, IB Brakes

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12
Q

What would you be concerned about if you were to lose Hydraulic system 2 and 3?

A

Landing gear deployment would have to be done by manual release handle. Nose gear will not deploy. Braking would only be done by accumulators up to 6 times with no anti skid.

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13
Q

What effects on the braking system would occur with a loss of hydraulic system 3?

A

50% of braking loss due to IB brake loss.

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14
Q

How many brake applications would be possible following failure of hydraulic systems 2 and 3?

A

Up to 6 applications from accumulators.

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15
Q

When will hydraulic pumps 1B and 2B turn on in the AUTO position?

A

During critical phases of flight when flaps are greater than 0 and cross side bus is powered with any AC GEN operating.

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16
Q

When will hydraulic pumps 1B and 2B turn on in the ON position?

A

When cross side bus is powered with any AC GEN operating.

17
Q

When will hydaulic pump 3B operate in the AUTO position?

A

Flaps greater than 0 and any AC GEN operating.

18
Q

What are the normal system pressures and quantity?

A

3000 PSI and 45-85%

19
Q

What temperature will solicit a HYD 1/2 HI TEMP message?

A

Greater than 96 degrees C

20
Q

When will hydraulic pump 3B operate regardless of switch position?

A

When ADG is deployed

21
Q

In cruise the right engine flames out and cannot be restarted. What would happen with hydraulics? Would a HYD 2 LO PRESS message appear?

A

Engine driven pump would fail. HYD 2 LO PRESS would appear. B pump would need to manually be turned on since pumps don’t respond to LO PRESS automatically.

22
Q

TRUE/FALSE, Hydraulic 1B,2B,3B will turn on automatically following a low pressure condition in their respective system?

A

False

23
Q

You are following HYD 1 LO PRESS checklist when you receive a HYD 2 LO PRESS caution message. What should you do?

A

Run QRH for double system failure.

24
Q

After an engine failure the QRH directs you to turn the associated HYD B bump to ON. Why?

A

Engine driven pump has turned off due to engine failure. B pump will need to be activated manually since there is “low pressure”.

25
Q

What PSI does the LO PRESS hydraulic system message turn on at?

A

Less than 1800 PSI

26
Q

Besides brake applications during Hydraulic failures, what are the accumulators responsible for?

A

Absorbing surges in the system, activating the parking break.

27
Q

How many total accumulators are there?

A

5 total, one for each hydraulic system and 2 for brakes.

EDV Systems (21 decks)

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