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M6 > 6.5 > Flashcards

6.5 Flashcards

1
Q

How can you measure screw thread pitch ?

A
  1. Screw thread pitch gauge
    Match thread on gauge to thread on screw/bolt and check if alined
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2
Q

Name all 5 classes of fit with threads

A

Class 1- loose fit
Class 2- free fit
Class 3- medium fit
Class 4- close fit
Class 5- tight fit

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3
Q

Explain a lock washer ?

A
  1. Used between joint surface and nut
  2. Made of steel
  3. Spring loaded washer which with friction, doesn’t allow vibration to loosen the nut which has been tightened on
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4
Q

What are 3 types of lock washer ?

A
  1. spring
  2. tab
  3. shakeproof
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5
Q

Explain spring washer ?

A
  1. Fitted beneath nut which compresses the spring creating friction when nut is tightened
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6
Q

Explain tab washer ?

A
  1. One of the flat sides is bent against the nut and other bent side is places into hole on surface
  2. Stops vibration loosening bolt
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7
Q

Explain shake proof washer ?

A
  1. Spring steel washer
  2. Tendency for nut to unscrew is prevented by the sharpe sides bitting into underside nut
  3. Can be repeatedly used
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8
Q

What is the diameter of lock wire measured in ?

A

1/1000 of an inch

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9
Q

What happens to end of wire once twisted final time ?

A

End is cut of then wire is bent backwards preventing injury

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10
Q

Where is locking wire used ?

A
  1. Used in critical areas where inspection intervals may be in frequent
  2. Areas prone to vibration
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11
Q

What’s the two locking wire techniques ?

A
  1. By hand
  2. Locking wire pliers
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12
Q

Explain lock plates ?

A
  1. Can be used repeatedly
  2. Secured to adjacent part of structure
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13
Q

Where are pal nuts used ?

A

Used where frequent load changes tend to loosen nuts

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14
Q

Why is quick release fasteners useful to use on aircraft ?

A
  1. They provide vibration resistant joining solution for panels which will repeatedly need removing and attaching using minimal effort.
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15
Q

What is the three common types of quick release fasteners ?

A
  1. Dzus
  2. Airloc
  3. Camloc
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16
Q

What are the Two types of dzus fasteners ?

A
  1. Heavy duty
  2. Light duty
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17
Q

What’s the difference between the heavy duty and light duty Dzus fastener ?

A
  1. Heavy duty fastener has a grommet
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18
Q

Two types of airloc fasteners ?

A
  1. Fixed type
  2. Floating type
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19
Q

What does a Airloc fastener consist of ?

A
  1. Stud
  2. Cross pin
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20
Q

What’s the advantages of a Camloc fastener ?

A
  1. used in confined areas
  2. Vibration resistant
  3. Connects quickly
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21
Q

What three parts does a quick turn fastener consist of ?

A
  1. Stud (male)
  2. Washer
  3. Receptacle
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22
Q

What is a pip pin ?

A
  1. Non-threaded fastener allowing rapid installation and removal of parts without tooling
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23
Q

What two types are a pip pin available in ?

A
  1. Locating pin
  2. Locking pin
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24
Q

What is a Circlip ?

A
  1. Spring clip used for external and internal locking
  2. Used for retaining seals and bearings
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25
Q

What is used to remove circlip ?

A
  1. special pliers
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26
Q

What loads does a taper pin carry ?

A

Shear

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27
Q

How is a plain taper pin (AN385) held in place ?

A
  1. Held by friction in reamed hole
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28
Q

What the difference between the AN385 and AN386 taper pin ?

A
  1. AN386 has its small end threaded
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29
Q

Why are roll pins used ?

A
  1. To provide locking for a joint where pin in unlikely to be removed
  2. To lock something Onto shaft or handle
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30
Q

How is a roll pin inserted ?

A

Pin compresses then when pushed into hole springs out holding securing it against edge of hole

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31
Q

How do you remove roll pin ?

A

Tap with pin punch

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32
Q

What’s the size of a Clevis pin measured in ?

A

1/16 inch increments

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33
Q

What’s the purpose of a “key” ?

A
  1. Used to align wheels and disc sprockets and gears onto a shaft
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34
Q

What’s the 4 types of keys ?

A
  1. Woodruff
  2. Square key
  3. Prat and Whitney
  4. GiB headed
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35
Q

Whats happens to the cross sectional area of a rivet after it has been driven ?

A

It increases

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36
Q

What head type on a rivet is an AN426

A

Countersunk

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37
Q

What type of head on a rivet is AN470 ?

A

Universal

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38
Q

How far shall a rivet extend beyond material prior to being driven ?

A

1.5 x rivet diameter

39
Q

How much does the Bucktail expand from its original diameter after driven ?

A

1.5 x original diameter

40
Q

What two systems of rivets are used today ?

A
  1. Airforce navy
  2. Military standards (MS20)
41
Q

What is the length of a rivet measured in ?

42
Q

What is the diameter of a rivet measured in ?

43
Q

What’s the countersink angle of the head ?

A

100 degrees

44
Q

Why does the universal rivet replace round,flat and brazier rivets ?

A

Has better fatigue strength

45
Q

Once countersunk, how much should a rivet head protrude surface ?

A

0.005-0.007 of an inch ( 5-7 thow)

46
Q

Why does the head of a countersunk rivet protrude surface ?

A

To allow all of the rivet guns energy to be transferred onto the head
( if rivet is flush, it lowers the energy transferred onto the head from gun )

47
Q

How is a pure aluminium rivet identified ?

A

By the letter A in the rivet code as they have no markings on the rivet itself

48
Q

How are 2024 rivets identified ?

A

Two raised dashes on head

49
Q

What are stainless steel rivets used for ?

A

Fastening corrosion resistant steel sheets
( identified by letter F )

50
Q

4 types of mechanical rivets ?

A
  1. Cherry max
  2. Olympic locks
  3. Cherry lock
  4. Huck locks
51
Q

Why Is special fasteners used over ordinary bolts/screws ?

A
  1. As when driven, there shank doesn’t change in dimension
  2. When driven the fastener doesn’t come under tensile
52
Q

How can you remove mechanical lock rivets ?

A

Pin punch through middle then drill rest of shank out

53
Q

Whats the 3 types of lock bolts ?

A
  1. Pull type
  2. Blind type
  3. Stump type
54
Q

With shear lock bolts, is there 1 or 2 grooves to place locking collar onto ?

55
Q

How is hi-lock bolt installed ?

A

Placing bolt into hole with a shear collar on other end which snaps off at a set torque ?
Ps. Made from strong material

56
Q

Whats different of a hi-lite bolt to hi-lock ?

A

Hi-lite is made from lighter material and shorter thread

57
Q

Whats the strongest special fastener used in aircraft construction ?

A

Taper-lock - because of its cork like shape which holds well on the walls in the hole

58
Q

What force is exerted on area around the installation of a hi-Tigue ?

59
Q

What is the length of a bolt measured In ?

60
Q

What is the diameter of a bolt measured in ?

61
Q

What part of the bolt is its grip length ?

A

Un threaded part of the shank

62
Q

What must be added if the unthreaded part of the bolt extends further than the thickness oof th material ?

63
Q

What is the letter which identifies a corrosion resistant steel bolt ?

64
Q

What letter identifies a aluminium bolt ?

65
Q

What load does clevis bolts hold ?

66
Q

What does the long grip length On a clevis pin increase ?

A

The shear strength.

67
Q

On a part number, what does an A signify ?

A

It signifies that there is no hole on the thread for a pin to go into.

68
Q

Why is the eye at the top of an eye bolt there ?

A

To allow a turnbuckle to be inserted !

69
Q

What is stamped on the head of a close tolerance bolt to show its identification ?

A

A triangle

70
Q

What is the tolerance for a close tolerance bolt ?

A

0.000-0.0005 inch

71
Q

Where is internal wrenching bolts used and made of ?

A

Made from steel and used in areas with high tensile loads

72
Q

Who developed precision airfare bolts ?

73
Q

What loads are eye bolts used for ?

A

External tension loads.

75
Q

Does military standard bolts have even dashed number, true or false ?

76
Q

What are the 3 classifications of screws ?

A
  1. Machine screws
  2. Structural screws
  3. Self-tapping screws
77
Q

What are machine screws primarily used for ?

A

Attaching fairings and structural panels
( thread runs full length of shank )

78
Q

What class of fit are screws normally ?

A

Class 2 ( free fit )

79
Q

How many degrees is a flat head screws head ?

80
Q

Whats the two types of nuts ?

A
  1. Self locking
  2. Non self locking
81
Q

Whats the tree types of self locking nuts ?

A

1.Metal - only used when temp reaches above 121 degrees
2.Nylon
3. Fibre

82
Q

Whats the 2 types of self locking nuts ?

A

Metal - only used when temp reaches above 121 degrees
Nylon

83
Q

Can nylon self locking nuts be used on engines ?

A

Yes. Only in locations specified by engine manufacturer !

84
Q

Why is the end of a metal self locking nut smaller in diameter than its body ?

A

As it allows the thread to grip the bolt providing the location methord.

85
Q

When would you use a castle nut ?

A

Under shear and tensile loads

86
Q

Whats the difference between a shear castle nut and ordinary castle nut ?

A

Shear castle nu is shallower and can only take shear loads

87
Q

Whats the 3 common thread standards ?

A
  1. British standard
  2. American national thread form
  3. Unified thread form
88
Q

Whats the 4 British standard thread form ?

A
  1. British standard whitworth (BSW)- has thread angle of 55 degrees.
  2. British standard fine (BSF)
  3. British standard pipe (BSP)
  4. British association (BA)- thread angle of 47.5
89
Q

Whats the two American standard threads ?

A

ANC - American national coarse
ANF - American national coarse fine
( both have thread angle of 60 degrees )

90
Q

Whats the three unified thread forms ?

A

UNC - coarse
UNF - fine
UNEF - extra fine
( All have angle of 60 degrees )`

91
Q

Whats the 3 thread profiles

A
  1. Square thread
  2. Buttress threads
  3. Acme threads
92
Q

What does the letter H signify in a bolts code ?

A

The bolt is used for wire locking.

93
Q

What’s the two classes of self tapping screw ?

A

Class A - sharpe
Class B - blunt

M6 (6 decks)

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