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M11 > 11.11 Hydrualic Power > Flashcards

11.11 Hydrualic Power Flashcards

1
Q

How do you calculate pressure?

A

Force/ Area

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2
Q

What pressure do civil aircraft hydraulic systems work at?

A

3000psi or 207 bar

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3
Q

What are the two types of hydraulic pressure?

A

. Hydrostatic pressure
. Hydrodynamic pressure

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4
Q

100KPa = ?

A

1DN/cm2

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5
Q

1 bar = ? Psi

A

14 psi

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6
Q

3000 psi = ? Bar

A

207 bar

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7
Q

What are the two types of hydraulic fluids?

A

Mineral oil
Synthetic oil

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8
Q

What colour is mineral oil?

A

Red

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9
Q

What colour is synthetic oil?

A

Violet

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10
Q

Can mineral and synthetic oil be mixed?

A

No

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11
Q

What is the specification for mineral and synthetic oil?

A

MIL-H 5606

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12
Q

What prefix’s do Boeing and airbus use?

A

Boeing = BMS
AIRBUS = NSA

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13
Q

What are the advatanges of hydraulic fluids?

A

. Low flammability
. Good lubricatuon
. Resistance to freeze
. Non evaporating
. Non foaming
. Chemical stability

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14
Q

What is the disadvantage of hydraulic fluid?

A

Hydroscopic quality
(Tendency to absorb water)

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15
Q

Which oil is better, mineral or synthetic?

A

Synthetic

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16
Q

What is the purpose of packing (back up ring)?

A

. Prevent leaks
. Separates the different fluid pressures

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17
Q

In high pressure areas, one seal may not be enough, so what would you use?

A

A backup ring

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18
Q

What are seals and back up rings made from?

A

Seals = rubber
Backup ring = Teflon

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19
Q

What are the two purposes of hydraulic reservoir?

A

. Compensate for variations in amount of hyduakid fluid needed from systems
. Keeps reserve of hydraulic fluid incase of a leaks

20
Q

Where would you use static seals?

A

Static seal - used to seal against steady or pulsating pressures

21
Q

What is used to prevent hyduakic fluid moving upwards if regret is a sudden loss of pressure?
(Stops sloshing)

A

A sheet metal baffle

22
Q

When is the drain valve located on resivour?

A

Lowest part to allow emptying

23
Q

Why is the hydraulic reservoir pressurised?

A

To ensure a positive supply of hydualic fluid always reaches the pumps

Prevents, foaming, evaporation, cavitation

24
Q

What colour hydraulic system does electrical pump produce?

A

Blue hydraulic system

25
Q

Once the RAT push button is activated in cockpit how long till it deploys?

A

Less than 1 second

26
Q

What is the purpose of the priority valve?

A

Closes the hydraulic circuit ti different users when there is a very high demand in system
(Not part of manifold)

27
Q

What does an accumulator do?

A

Acts as a damper to smooth out pressure fluctuation in the system caused by sudden user demand

28
Q

Where is the sampling valve for fluid sampling located and what is the purpose of it?

A

. A sampling valve is located in the HP manifold
. Checks for water contamination no reduction in fluid performance

29
Q

When doing a leak test, what does it test for and where does it not test?

A

Tests in main user components such as flight controls

Does not test pressurisation or distribution components

30
Q

What pressure do the resivours run at?

A

50 psi

31
Q

What is the hydraulic system measured in?

A

Bar

32
Q

What connects reservoir to pumps?

A

Supply lines

33
Q

What hydaulic fluid is better?

A

Synethic

34
Q

What psi do vertical displacement pumps run at?

A

3000psi

35
Q

Why do we need filters?

A

Stops FOD damaging components

Filters also have a screen device

36
Q

When a leak is detected what shuts the valve?

A

A leak measurement solenoid valve

37
Q

What differs the fixed displacement pump and the variable pump?

A

Variable has a wobble plate which means the angle of wobble can be changed

Fixed doesn’t

38
Q

Where is the depressurised valve located?

A

At ground service panel

39
Q

Where is the quantity transmitter located in the resivour and how does it operate?

A

. Located on the side of resivour housing

. Uses calamities to measure fluid level for cockpit to see

40
Q

What is the purpose of power transfer unit?

A

Another method of providing auxiliary pressurisation

Transfers hydraulic power between two systems, no fluid is transferred.

41
Q

What is another name for electric pump?

A

Demand pump

42
Q

What is the leak measurement manifold connected to?

A

The pressure line supplying to users

43
Q

What does the LP manifold do?

A

Connects all return lines into a single line going back to the reservoir

44
Q

What does the term high pressure distribution describe?

A

The process of moving the pressurised fluid from hydraulic pumps to hydraulic users

45
Q

Where would you use dynamic seals?

A

Dynamic seal - used to seal where stroking or rotational movements

M11 (41 decks)

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