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Karen > Hydraulic > Flashcards

Hydraulic Flashcards

1
Q

Hydraulic systems 1,2and 3 have a normal pressure of?

A

3000 psi

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2
Q

Low pressure (caution) appears at what pressure?

A

1800

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3
Q

High pressure occurs at what pressure?

A

3200 psi

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4
Q

What is the normal system quantity?

A

45% to 85%

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5
Q

High temperature condition occurs at what temp?

A

> _ 96° C

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6
Q

The HYD HI TEMP caution indicates that hydraulic fluid is hot in what part of the system?

A

The reservoir

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7
Q

How many hydraulic pumps are there?

A

6 total
3 - full time “A” pumps
3 - part time “B” pumps

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8
Q

When are the “B” pumps active?

A

Switch is ON or
With switches in AUTO
At least one generator on line and flaps > 0

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9
Q

When will hydraulic pump 3B operate?

A

Switch ON or
Switch in AUTO or
At least one generator on line and flaps>0 or
ADG deployed

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10
Q

What type of hydraulic fluid is used?

A

Skydrol

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11
Q

What color is the hydraulic fluid?

A

Purple

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12
Q

When will pressure relief occur?

A

> _ 3750 psi

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13
Q

How many separate hydraulic systems are there in the CRJ 900?

A

Three

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14
Q

Where are hydraulic systems one and two located?

A

Aft equipment bay

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15
Q

How are hydraulic systems one and two cooled?

A

Cooled by air/ oil heat exchanger located in AFT equipment bay

Air from ram air scoop is directed across heat exchanger

On the ground and electric fan inside the heat exchanger draws air from ram scoop for cooling

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16
Q

How many pumps do system one and system to have

A

Main pump A (engine driven pump, EDP). 1A and 2A

Backup pump B (electric AC motor pumps- ACMP). 1B and 2B

17
Q

Which hydraulic system is the largest

A

3

18
Q

When do the main pumps operate

A

1A and 2A are engine driven and operate any time the associated engine is running

19
Q

When do back up pumps 1B and 2B -ACMP -AC motor pumps operate

A

They are controlled by switch is Off, Auto and On

AUTO- Pumps will operate when:
their buses are powered
any generator operating
and flaps > zero

Manual-place switch to the ON position

1B and 2B DO NOT automatically start after engine or EDP failure

20
Q

What is a hydraulic accumulator in which systems have it

A

Systems one and two have a hydraulic accumulator which hydraulic delivers hydraulic fluid under pressure to the EDPs and ACMPs.
One accumulated per system stores hydraulic pressure, gas charged with dry nitrogen

21
Q

How do you stop the flow of hydraulic fluid between the Reservoir and the EDP?

A

You can either press the L or R HYD SOV switch OR ENG FIRE PUSH switch

22
Q

What is special about pump 3A

A

It only has on and off there, is no AUTO

23
Q

What is special about pump 3B

A

3B is automatically powered by the ADG bus during AC failure

24
Q

What modes do you pump 3B have

A

Auto- When:
bus is powered
any generator is operating
flaps greater than zero

Manual

On

25
Q

What does hydraulic system three power

A 
Rudders
Elevators
Ailerons
Inboard ground spoilers
Inboard brakes
Nosewheel steering
Landing gear
26
Q

Where is system 3 located

A

Hydraulic compartment.

It has an accumulator that delivers to the ACMPs the same as the other two systems, and the largest Reservoir

27
Q

How is system three hydraulic cooled

A

It relies on natural convection to dissipate heat because it’s not near any appreciable heat source

28
Q

What are the hydraulic system limitations

A

Each system is normally pressurized at 3000 PSI.

Low pressure caution at 1800

High pressure caution at 3200

High pressure relief at 3750

Normal system level 45 to 85%

High temperature caution at 96° C

Hydraulic fluid type is Skydrol

29
Q

How many total hydraulic system accumulators are there

A

5

One for each hydraulic system

And one for each brake

Charged with dry nitrogen

Dampens pressure surges

30
Q

When do you wanna be in to be turned on during auto mode

A

When flaps are greater than zero and at least one generator is online

By having it in auto that ensures hydraulic power will be available during high demand

1B and 2B do not turn on automatically if low pressure exists

Karen (22 decks)

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