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
What is used to remove circlip ?
1. special pliers
26
What loads does a taper pin carry ?
Shear
27
How is a plain taper pin (AN385) held in place ?
1. Held by friction in reamed hole
28
What the difference between the AN385 and AN386 taper pin ?
1. AN386 has its small end threaded
29
Why are roll pins used ?
1. To provide locking for a joint where pin in unlikely to be removed 2. To lock something Onto shaft or handle
30
How is a roll pin inserted ?
Pin compresses then when pushed into hole springs out holding securing it against edge of hole
31
How do you remove roll pin ?
Tap with pin punch
32
What’s the size of a Clevis pin measured in ?
1/16 inch increments
33
What’s the purpose of a “key” ?
1. Used to align wheels and disc sprockets and gears onto a shaft
34
What’s the 4 types of keys ?
1. Woodruff 2. Square key 3. Prat and Whitney 4. GiB headed
35
Whats happens to the cross sectional area of a rivet after it has been driven ?
It increases
36
What head type on a rivet is an AN426
Countersunk
37
What type of head on a rivet is AN470 ?
Universal
38
How far shall a rivet extend beyond material prior to being driven ?
1.5 x rivet diameter
39
How much does the Bucktail expand from its original diameter after driven ?
1.5 x original diameter
40
What two systems of rivets are used today ?
1. Airforce navy 2. Military standards (MS20)
41
What is the length of a rivet measured in ?
1/16 inch
42
What is the diameter of a rivet measured in ?
1/32 inch
43
What’s the countersink angle of the head ?
100 degrees
44
Why does the universal rivet replace round,flat and brazier rivets ?
Has better fatigue strength
45
Once countersunk, how much should a rivet head protrude surface ?
0.005-0.007 of an inch ( 5-7 thow)
46
Why does the head of a countersunk rivet protrude surface ?
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
How is a pure aluminium rivet identified ?
By the letter A in the rivet code as they have no markings on the rivet itself
48
How are 2024 rivets identified ?
Two raised dashes on head
49
What are stainless steel rivets used for ?
Fastening corrosion resistant steel sheets ( identified by letter F )
50
4 types of mechanical rivets ?
1. Cherry max 2. Olympic locks 3. Cherry lock 4. Huck locks
51
Why Is special fasteners used over ordinary bolts/screws ?
1. As when driven, there shank doesn’t change in dimension 2. When driven the fastener doesn’t come under tensile
52
How can you remove mechanical lock rivets ?
Pin punch through middle then drill rest of shank out
53
Whats the 3 types of lock bolts ?
1. Pull type 2. Blind type 3. Stump type
54
With shear lock bolts, is there 1 or 2 grooves to place locking collar onto ?
2
55
How is hi-lock bolt installed ?
Placing bolt into hole with a shear collar on other end which snaps off at a set torque ? Ps. Made from strong material
56
Whats different of a hi-lite bolt to hi-lock ?
Hi-lite is made from lighter material and shorter thread
57
Whats the strongest special fastener used in aircraft construction ?
Taper-lock - because of its cork like shape which holds well on the walls in the hole
58
What force is exerted on area around the installation of a hi-Tigue ?
Radial
59
What is the length of a bolt measured In ?
1/8 inch
60
What is the diameter of a bolt measured in ?
1/16 inch
61
What part of the bolt is its grip length ?
Un threaded part of the shank
62
What must be added if the unthreaded part of the bolt extends further than the thickness oof th material ?
Washer
63
What is the letter which identifies a corrosion resistant steel bolt ?
C
64
What letter identifies a aluminium bolt ?
DD
65
What load does clevis bolts hold ?
Shear
66
What does the long grip length On a clevis pin increase ?
The shear strength.
67
On a part number, what does an A signify ?
It signifies that there is no hole on the thread for a pin to go into.
68
Why is the eye at the top of an eye bolt there ?
To allow a turnbuckle to be inserted !
69
What is stamped on the head of a close tolerance bolt to show its identification ?
A triangle
70
What is the tolerance for a close tolerance bolt ?
0.000-0.0005 inch
71
Where is internal wrenching bolts used and made of ?
Made from steel and used in areas with high tensile loads
72
Who developed precision airfare bolts ?
NAS
73
What loads are eye bolts used for ?
External tension loads.
74
What
75
Does military standard bolts have even dashed number, true or false ?
True
76
What are the 3 classifications of screws ?
1. Machine screws 2. Structural screws 3. Self-tapping screws
77
What are machine screws primarily used for ?
Attaching fairings and structural panels ( thread runs full length of shank )
78
What class of fit are screws normally ?
Class 2 ( free fit )
79
How many degrees is a flat head screws head ?
100
80
Whats the two types of nuts ?
1. Self locking 2. Non self locking
81
Whats the tree types of self locking nuts ?
1.Metal - only used when temp reaches above 121 degrees 2.Nylon 3. Fibre
82
Whats the 2 types of self locking nuts ?
Metal - only used when temp reaches above 121 degrees Nylon
83
Can nylon self locking nuts be used on engines ?
Yes. Only in locations specified by engine manufacturer !
84
Why is the end of a metal self locking nut smaller in diameter than its body ?
As it allows the thread to grip the bolt providing the location methord.
85
When would you use a castle nut ?
Under shear and tensile loads
86
Whats the difference between a shear castle nut and ordinary castle nut ?
Shear castle nu is shallower and can only take shear loads
87
Whats the 3 common thread standards ?
1. British standard 2. American national thread form 3. Unified thread form
88
Whats the 4 British standard thread form ?
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
Whats the two American standard threads ?
ANC - American national coarse ANF - American national coarse fine ( both have thread angle of 60 degrees )
90
Whats the three unified thread forms ?
UNC - coarse UNF - fine UNEF - extra fine ( All have angle of 60 degrees )`
91
Whats the 3 thread profiles
1. Square thread 2. Buttress threads 3. Acme threads
92
What does the letter H signify in a bolts code ?
The bolt is used for wire locking.
93
What’s the two classes of self tapping screw ?
Class A - sharpe Class B - blunt