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Kemble > Lewis Revision Cards > Flashcards

Lewis Revision Cards Flashcards

1
Q

What’s used to attach to fabric to wood

A

Dope

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2
Q

What’s the issue with dope

A

It’s very flammable

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3
Q

What’s added to dope to protect it from UV degradation

A

Aluminium

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4
Q

What’s type of fabric is used for aircraft

A

Polyester and glass fibre

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5
Q

What are the 3 inspection pannels

A

Spring, wood frames and zip

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6
Q

What are the two tools used to test the tension on fabrics? What ones better

A

Seyboth and maul.
Maul is better as it doesn’t puncture a hole in it

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7
Q

What type of repair is used for straight edge tears in fabrics

A

Herringbone stitches

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8
Q

What locking device can be reused

A

Shake proof washers

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9
Q

What are the most common materials used in locking wire

A

Copper and stainless steel

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10
Q

What’s the most common type of 1/4 turn fasteners

A

Dzus

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11
Q

What’s the difference between heavy and light duty Dzus fasteners

A

Heavy requires a grommet

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12
Q

If a internal wrenching bolt is installed in aluminium what must be considered and why

A

Placing a washer under the head must be considered to spread the pressure that’s being exerted onto the surface

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13
Q

At what temperature do low temp self locking nuts operate

A

Below 121 degrees

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14
Q

What’s the difference between AN and AC fittings

A

AN
Longer
Blue or black
Course thread

AC
Shorter
Grey
Finer thread

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15
Q

Which fitting ( AN or AC ) has recess

A

AN

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16
Q

What does the D mean marked on a hydraulic fitting

A

Made from aluminium

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17
Q

What does the S mean marked in a hydraulic fitting

A

That it’s made from CRES

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18
Q

When are permaswage repairs done

A

In quick in situ repairs

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19
Q

What do lay lines indicate on hose

A

Indicates any twisting

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20
Q

What’s the most common material used for inside of tubing and why

A

Teflon because it’s chemically compatible with most fluids

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21
Q

What’s the low pressure, medium pressure and high pressure of hose

A

Low- 600
Medium- up to 3000psi
High- over 3000psi

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22
Q

When wouldpotted repairs used for

A

Holes up to 2.5cms

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23
Q

What’s the issue with radiography

A

They can’t detect delaminations

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24
Q

What’s the carbon percentage In
Low carbon steel
Medium carbon steel
And high carbon steel

A

0.1-0.3
0.3-0.5
0.5-1.05

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25
Q

What class a screws usually

A

2

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26
Q

What are the 3 general grades of stainless steel

A

Austenitic
Ferritic
Martensitic

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27
Q

What is an AN426

A

Countersunk head rivet

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28
Q

What’s a AN470

A

Universal head rivet

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29
Q

Why are countersunk rivets more commonly used on aircraft surfaces

A

Aerodynamics

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30
Q

What does 3xxx

A

Manganese

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31
Q

What’s 5xxx

A
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32
Q

What’s 4xxx

A

Silicon

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33
Q

What are the two common nickel alloys

A

Morel and inconel

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34
Q

What is the reducing agent in corrosion

A

Anode

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35
Q

What’s the most common rivet type used

A

2117

36
Q

Two types of fibreglass

A

E and s glass

37
Q

What’s fibreglass made up from

A

Silica glass

38
Q

What’s aramid repaired with

A

Fibreglass

39
Q

Why isn’t boron commonly used on aircraft

A

Because it’s very expensive and can be dangerous

40
Q

Where’s ceramic used

A

In high temperatures

41
Q

What’s the negative of pre impregnated fabrics

A

Must be frozen

42
Q

What’s the major diameter and minor diameter on a male thread

A

Major - crest to crest
Minor- root to root

43
Q

What’s the major and minor diameter in a female thread

A

Major is root to root
Minor is crest to crest

44
Q

What’s the thread angle of British thread forms, what ones the anomaly and what’s the degrees of that

A

55 degrees
Ba anomaly and angle of 47.5

45
Q

What’s the thread angle of American thread forms

A

60

46
Q

What’s the thread angle of unified thread forms

A

60

47
Q

What does the x mean on the top of a bolt head

A

That it’s a steel bolt

48
Q

What does the dash on top of a bolt head mean

A

That it’s made of a CRES

49
Q

What does the triangle mean on top of a bolt

A

Shows it’s a close tolerance bolt

50
Q

What does the double dashes on a bolt head mean

A

That it’s made from aluminium

51
Q

When are stepped studs used

A

In softer materials

52
Q

What’s the diameter of rivets measured in

A

1/32 of an inch

53
Q

What’s the length of the rivet measured in

A

1/16th

54
Q

How’s a 1100 rivet identified

A

No marking
With letter A (absent)

55
Q

How’s a 2117 rivet identified

A

Letters AD
A dimple

56
Q

What’s a 5056 rivet identified by

A

The letter B
Has a cross on it

57
Q

How’s a 2017 rivet identified

A

A dot
Identified with a D

58
Q

How’s a 2024 rivet identified

A

DD
Double dash

59
Q

What’s the economic advantage of cherry max rivets over cherry locks

A

Cherry max require one size puller

60
Q

What type of metals are more succesptible to exfoliation

A

Wrought

61
Q

What’s the difference between a high lock and a high lite fastner

A

High lite are lighter

62
Q

What does PHDAN stand for

A

Physically dangerous

63
Q

Where is magnesium used in aircraft

A

Landing gear/wheels

64
Q

For rigid fluid lines what’s classified as
High pressure
Medium
Low

A

High is over 1500
Medium is below 1500
Low is suction and return

65
Q

How’s tubing size determined

A

By outside diameter in 1/8ths of an inch

66
Q

Where’s aluminium obtained from

A

Bauxite ore

67
Q

What’s the flair angle of an AN fitting

A

37 degrees

68
Q

What’s the flare angle of AC fittings

A

35 degrees

69
Q

How are flareless fittings sealed

A

Ball and bush principle

70
Q

What are the two forces bearings are subjected to

A

Axial and radial

71
Q

What’s the issue of using ball bearings

A

They can only withstand light radial loads

72
Q

What does F, O and H stand for

A

Fabricated, annealed and strain hardened

73
Q

What two materials are used in cables

A

Aluminium and copper

74
Q

What happens to the ability of cables to carry a current when there enclose with other cables

A

They can’t carry as much current due to it will produce heat

75
Q

What are thermocouples made from

A

Chrome land alumel

76
Q

When are bevel gears used

A

When a drive needs to be transmitted to a different axis

77
Q

Where are planetary gears used in aircraft

A

As reduction gearing in aircraft engines

78
Q

Benefits of using a roller bearing over a ball bearing

A

Roller will take more radial loads due to larger contact area

79
Q

What are the +’s of synchronous belts

A

Low maintenance
Non slip
Non lubricated

80
Q

Which of the following cables are flexible and which are non flexible
1x7
1x19
7x7
7x19

A

1x7 non flexible
1x19 non flexible
7x7 flexible
7x19 flexible

81
Q

Benefits of using lock clad cable

A

Prevents sag
Prevents vibration

82
Q

What’s the role of a cable turnbuckle

A

Facilitates cable tensioning

83
Q

What’s the use of fairleads

A

Prevents the wire from coming in contact with the structure

84
Q

If a turnbuckle had a groove on it what does that indicate

A

That it’s a left hand thread

85
Q

What’s the advantage of a helical gear over a spur gear

A

They’re quieter and can carry heavier loads

86
Q

Advantages of multiple pulley drives

A

Allow change in speed

Kemble (39 decks)

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