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M11 New > 11.11 > Flashcards

11.11 Flashcards

1
Q

How much psi in large transports

A

5000psi

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2
Q

Civil aircraft pressure figure

A

207 bar or 3000 psi

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3
Q

How do we create a higher force

A

Increase diameter of actuator or pressure

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4
Q

What are the 2 types of hydraulic pressure

A

Hydrostatic pressure

Hydrodynamic pressure

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5
Q

How do you make sure there is enough redundancy for safe flight

A

Several hydraulic systems

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6
Q

Aircraft with two or more hydraulic systems are required to have what

A

Independent mechanical system

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7
Q

Airbus pressure distribution section

A

Manifold

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8
Q

Boeing pressure distribution section

A

Module

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9
Q

An open centre system has fluid flow but what does it not have

A

No pressure in system when actuating mechanisms are idle

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10
Q

When is the fluid under pressure in a closed centre system

A

Whenever the pump is operating

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11
Q

Advantage of open centre vs closed centre

A

Continuous pressurisation of system is eliminated

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12
Q

Why are small power packs good

A

Reduces weight by eliminating hydraulic lines and large quantities of hydraulic fluid

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13
Q

What pressurises quicker and transmits force more efficiently , fluid or gas?

A

Fluid

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14
Q

What is chemical stability

A

Ability to resist oxidation and deterioration for prolonged periods

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15
Q

What flash point do we want

A

High for good resistance to combustion and Low degree of evaporation at normal temperatures

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16
Q

What fire point do we want

A

High

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17
Q

Diffrenve between flash point and fire

A

Fire point is when it will continuously burn

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18
Q

When would mineral oil be used and is it interchangeable?

A

When fire hazard is low & it is interchangeable and dyed red

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19
Q

What is a problem with polyalphaolefin based oil

A

High viscosity at low temperatures

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20
Q

Most common aircraft hydraulic fluid

A

Skydrol

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21
Q

What the advantage to type IV type 1 have

A

Weight saving

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22
Q

What fluids don’t mix

A

Petroleum and phosphate ester

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23
Q

Where does pressurised filling happen

A

Service panel

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24
Q

Where is the sampling valve

A

Hp manifold

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25
Q

What’s the sampling valve end cap

A

Products valve from dirt and also tool to open needle valve (sampling valve)

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26
Q

How often is a routine sample for hydraulic sampling

A

Once a year

every 3000 flight hours

when airframe manufacturer suggests

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27
Q

What should you do if u suspect contamination

A

Fluids drained and replaced and samples taken

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28
Q

Where is leak measurement manifold linked to

A

Hp manifold

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29
Q

What aircraft uses non pressurised resouvoris

A

Aircraft that is non designed for violent manouvers

Fly at high altitudes

Or where resouvoir is in a pressurised area

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30
Q

What’s the purpose of the reservoir pressurisation module

A

Supplies bleed air to the reservoirs

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31
Q

How many filters and check valves does a pressurisation module have

A

2

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32
Q

What does an accumulator do

A

Accumulate energy and smoothen out pulsations

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33
Q

What is a spherical accumulator and what does it contain

A

Steel sphere divided into 2 chambers

Top is fluid at system pressure
Bottom is charged with nitrogen or air

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34
Q

What is a cylindrical accumulator

A

Piston separates fluid from air

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35
Q

How is a piston sealed in a cylindrical accumulator

A

Double seal rings to prevent internal leakage

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36
Q

Where are cylindrical accumulators used

A

High pressure systems

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37
Q

What is an accumulator preload

A

Nitrogen chamber charged to pre determined pressure lower then system operating temperature

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38
Q

What’s the primary source of pressure generation

A

Mechanical driven pumps

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39
Q

What’s a non positive displacement pump

A

Produces continuous flow but output varies with pressure

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40
Q

What’s a constant displacement pump

A

Forces a fixed amount of fluid with each revolution

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41
Q

What kind of pump is a gerotor

A

Positive displacement

42
Q

What type of pump is a piston pump

A

Constant displacement or variable

Most common main system (positive displacement)

43
Q

What is a drive coupling

A

Short shaft with set of male splines on both ends

44
Q

What kind of device is a pump drive coupling

A

Saftey device

45
Q

What type of pump is axis piston

A

Constant displacement axial pump

46
Q

What type of pump is a vane pump & many blades in a vane pump

A

Constant displacement pump with 4 blades

47
Q

What does a variable displacement pump convert

A

Mechanical energy to hydraulic and vice versa

48
Q

What pump is more energy efficient

A

Variable displacement is more efficient then fixed

49
Q

What term is used to describe primary hydraulic power

A

Main pressurisation

50
Q

When are electrically driven pumps used

A

Emergencies and during ground operation when engines aren’t running

51
Q

Why are hand pumps installed

A

Testing and emergencies

52
Q

Why is single action hand pump not used

A

Inefficient

53
Q

What type of pump is the RAT

A

Vdp

54
Q

How is the electric motor of the pump cooled

A

With air or hydraulic fluid

55
Q

What percentage of system failure is down to contamination

A

85%

56
Q

How many microns in an inch

A

25400 microns

57
Q

What filter is used for surface cleaning

A

Wire mesh

58
Q

Which filter has the best filtration quality

A

Micro glass as it stops anything bigger then 10 microns

59
Q

What does a bypass relief valve do

A

Opens if the filter clogs as dirty oil is preferred over no flow

60
Q

What is the purpose of a filter bypass system?

A

The filter bypass system is activated when the filter element becomes clogged and unable to filter, allowing unfiltered fluid to bypass the filter element.

Example sentence: A spring-loaded valve opens to allow the unfiltered fluid to bypass the filter element.

61
Q

What is a differential pressure indicator used for?

A

A differential pressure indicator is used to provide a visual sign that the filter is clogged and the filter bypass has been activated.

Example sentence: A red button installed on the filter pops into view when the filter is clogged, and it stays in view even if the bypass valve opens.

62
Q

What are the configurations of differential pressure indicating devices?

A

electrical switches, continuous reading visual indicators, and visual indicators with memory.

Example sentence: Visual indicators with memory usually take the form of magnetic or mechanically latched buttons or pins that extend when the differential pressure exceeds that allowed for a serviceable element.

63
Q

Why are visual indicators with memory useful?

A

Visual indicators with memory provide a permanent warning of a loaded element, particularly in remote locations where continuous monitoring is impossible.

Example sentence: The button or pin, once extended, remains in that position until manually reset, providing a permanent warning of a loaded element.

64
Q

What does a pressure relief valve consist of

A

Spring loaded valve which is operated by hydraulic pressure and spring tension

65
Q

3 most common pressure relief valves

A

Ball
Sleeve
Poppet

66
Q

What does a thermal relief valve do

A

Relieve pressure due to thermal expansion

67
Q

Purpose of pressure regulator

A

Manage output to pump to maintain system operating pressure within a predetermined range

Pump to turn without resistance

68
Q

What seals are used on moving parts

A

Packing’s

69
Q

What seals are used on non moving parts

A

Gaskets

70
Q

What are v rings

A

One way seal and it faces the pressure

71
Q

What are u ring seals used for

A

Brake assemblies and pressure under 1000psi

72
Q

What direction does a u ring seal

A

One direction

73
Q

What direction is an o ring

A

Both

74
Q

What’s a red oring for

A

Fuel

75
Q

What colour is a hydraulic fluid o ring

A

Blue

76
Q

Backup ring material

A

Teflon

77
Q

What to check in a back up ring

A

Coils don’t separate more then 1/4 inch when unrestrained

78
Q

When are static seals used

A

Steady or pulsating force

79
Q

When is a dynamic deal used

A

Stroking or rotational movement

80
Q

What do we sue a asbestos gasket

A

Heat resistance

81
Q

When do we use a copper gasket

A

Non compressive semi soft gasket , spark plug

82
Q

When do we use cork gaskets

A

Oil seal between engine crankcase and accessories

83
Q

When do we use a rubber gasket

A

When a compressible gasket is needed

84
Q

Before you install an oring what should you do

A

Immerse it in clean hydraulic fluid

85
Q

What are the 3 common valves

A

Ball , sleeve , poppet

86
Q

What do flow control valves do

A

Control speed and direction of fluid in hydraulic system

87
Q

What are the two selector valves and what do they do

A

Open - continuous flow even when selector can’t actuate a unit

Closed - blocks flow where valve is in neutral or off position ( 4 port valves most used)

88
Q

What the purpose of a quick disconnect valve

A

Prevent loss of fluid when unit is removed

89
Q

What does a shuttle valve do

A

Isolate normal system from an alternate or emergency system

90
Q

What a heat exchanger used for

A

Cool hydraulic fluid

91
Q

How do we ensure there is a leak proof joint on a disconnecting pipe fitting

A

Locate the sleeve on the pipe in the right position

92
Q

What’s a non disconnecting pipe fitting used for

A

Repair broken pipes by swaging

93
Q

Hose classification

A

Low
Medium
High

( always disconnecting type)

94
Q

What’s case drain fluid used for

A

Cool and lubricate pump before entering reservoir

95
Q

How is a subsystem indicated

A

Particular number and colour

96
Q

What does a pressure transducer do

A

Convert one form of energy to another

97
Q

What’s a bourdon tube

A

Elastic type pressure transducer

Used for liquid and pneumatic pressure measurements

Range of 100,000 psi

98
Q

How do you overcome the short comings of fly by wire

A

Use power by wire

99
Q

How do you overcome the short comings of fly by wire

A

Use power by wire

100
Q

When is a hydraulic motor driven generator used

A

When electrical failure occurs as it’s an alternative source of power

It’s an AC generator

M11 New (17 decks)

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