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M11 Aircraft Systems > hydraulics > Flashcards

hydraulics Flashcards

1
Q

minimum amount of hydraulics required

A

2

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2
Q

what does check valve do

A

allow fluid to flow in one direction

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3
Q

what are hydraulics measured in

A

Psi

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4
Q

purpose of leak measurement solenoid valve in regard to hydraulic system

A

shuts down hydraulic fluid when leak is detected , it closes supply line

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5
Q

Do aircraft’s use hydrostatic or hydrodynamic

A

Hydrostatic

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6
Q

How is hydrostatic pressure developed

A

Static or nearly static fluids

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7
Q

How is hydrodynamic pressure developed

A

By flow in a system

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8
Q

How much is 1 bar in psi

A

14.5

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9
Q

How much is 1 Dan cm2 in kpa

A

100kpa

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10
Q

How much bar is 3000 psi

A

207 bar

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11
Q

Disadvantage of synthetic oil

A

More hydrophobic then mineral

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12
Q

Boeing hydraulic fluid

A

Bms

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13
Q

Airbus hydraulic fluid

A

Nsa

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14
Q

What are seals made of

A

Rubber

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15
Q

What is backup ring made of

A

Teflon

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16
Q

When is an o-ring used

A

When over 1500 psi

17
Q

Difference between static and dynamic seal

A

Static uses 1 seal , whereas dynamic uses more then one

18
Q

Resouvoir pressure

A

50psi

19
Q

When is ground access panel accessed

A

Only on ground

20
Q

In a variable displacement pump when is used to stop movement

A

Wobble plate or yoke

21
Q

In electrical pumps how is the motor cooled

A

By air or hydraulic fluid

22
Q

When is a demand pump used

A

When edps can’t maintain pressure

23
Q

How does a ram air turbine work

A

Hydraullically retracted and deployed within 1 second

24
Q

Purpose of hp filter

A

Protect system from debris

25
Q

Colour of priority valve

A

Red

26
Q

What does a priority valve do

A

Close circuit to different users when in demand to protect high value users

27
Q

What is the purpose of an accumulator

A

Dampener and smoothen out pressure fluctuations

28
Q

What does the low pressure manifold do

A

Combines fluid from all feeds for return to reservoir

29
Q

Hose inner tube material

A

Teflon

30
Q

You can mix mineral and synthetic oil true or false

A

False

31
Q

Oil specification for mineral oil

A

MIL-H-5606

32
Q

When is a static seal used

A

Used against steady or pulsating force

33
Q

When is dynamic seal used

A

Stroking or rotational movements occur

34
Q

Each resovoir has its own depression valve (bleed) true or false

A

True

35
Q

Purpose of check valve

A

Prevents flow into manifold

36
Q

Civil aircraft hydraulic working pressure

A

3000psi

37
Q

Synthetic oil hydraulic fluid colour

A

Violet

38
Q

Where is the depression valve for hydraulic reservoir

A

Ground service panel

M11 Aircraft Systems (23 decks)

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