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Cert 2 Mechanical Engineering > MEA109 Part B > Flashcards

MEA109 Part B Flashcards

1
Q

Ensure the hardware is approved…

A

Ensure the hardware is approved by the manufacturer of aircraft/engine/components

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2
Q

Hardware is manufactured to a…

A

Hardware is manufactured to a specified standard of quality to meet airworthiness requirements

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3
Q

‘…’ aircraft parts …

A

“Standard” aircraft parts are those items that are manufactured to specifications.

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4
Q

Class 1

A

Loose fit (easily turned with fingers)/ A commercial wing nut

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5
Q

Class 2

A

Free fit (screws)/ Most screws

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6
Q

Class 3

A

Medium fit (bolts)/ Aircraft bolts

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7
Q

Class 4

A

Close fit (requires a wrench to turn nut)/ Requires a spanner to turn the nut onto the bolt thread

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8
Q

Threads designated by:

A

Diameter, Number of threads per inch, Thread series, Class.

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9
Q

Bolt

A

A threaded fastener that can withstand shear loads or tension loads or both.

Three Main Parts:

  • Head
  • Thread
  • Grip (unthreaded portion).
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10
Q

AN
NAS
MS

A
  • AN – Air Force Navy
  • NAS – National Aircraft Standard
  • MS – Military Standard
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11
Q

Bolt Fit

A

Required “bolt stress” achieved by correct fit of bolt in the bolt hole and torque applied

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12
Q

Types of bolt fits

A

Loose fit, Push fit, Tight-drive fit, Interference fit

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13
Q

In the AN bolt hardware code:

A

Diameter is given in 16th of an inch

Heads Been drilled

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14
Q

What determines grip length

A

Material thickness determines grip length

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15
Q

Add plain washers to adjust …

A

Add plain washers to adjust grip length

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16
Q

How many threads are allowed in the bolt hole or allowed to contact the nut?

A

None

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17
Q

What is the minimum number of washers allowed under the bolt head and under the nut?

A

A minimum of one

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18
Q

Unless otherwise specified, the torque values given in MD are for …

A

clean dry threads

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19
Q

Preload on fastener threads determines

A

Strength of joints

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20
Q

Incorrect preload may result in

A

Failure of assembled parts

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21
Q

Hex – Head Bolt (AN3 – AN20)

A
  • Suitable for tensile and shear applications
  • Made of nickel steel, 2024 aluminium alloy, corrosion
    resistant steel and titanium
  • Cadmium plated steel bolts
    Head marked with asterisk or cross
22
Q

drilled Head Bolt (AN73 – AN81)

A
  • Head drilled in multiple directions to receive safety wire
  • Interchangeable with standard hex head bolts
  • Head marked with asterisk * or cross +
23
Q

Close Tolerance Bolt

A
  • Un-plated shank, apply grease on shank prior to
    installation
  • Cannot be substituted by standard AN hex head bolts.
24
Q

Clevis Bolt

A
  • Head slotted to receive a flat screwdriver
  • Most have drilled shank
  • Relatively long grip length with short threads
25
Q

Eye Bolt

A
  • external tension load applications
  • Cadmium plated alloy steel material
  • Threaded end may or may not be drilled.
26
Q

Aircraft Nuts

A
  • Internally threaded component, providing a clamping
    action in bolted joints
  • Available as non-self locking or self- locking nuts
  • Made from cadmium plated carbon steel,
    stainless steel, or anodized 2024T
27
Q

Non – Self Locking Nuts (AN310 & AN320)

A
  • Castellations (slots) in nut accommodate a cotter pin to
    the secure bolt
    -
28
Q

AN310

A

Thick nut , withstands large tensile loads, also

known as a castle nut

29
Q

AN320

A

Thin nut, used only in shear load applications,

also known as a castellated shear nut.

30
Q

Plain Nut

A

AN310
- Thick nut, for tension and shear applications
- requires external locking feature e.g. check nut or
spring lock washer

31
Q

Check nut

A

AN316
- Thin nut used to lock AN315 plain nut
- Available in left and right hand thread
configurations.

32
Q

Self Locking Nuts

A
  • Design integrates a locking device
  • Two types - nylon and metal
  • Do not use on parts subject to rotation
33
Q

Self Locking Nuts – Elastic Stop (Nyloc)

A
  • Locking action provided by an unthreaded nylon insert

- Not suitable in above 250 °F applications

34
Q

Self Locking Nuts – Metal Lock Nuts

A
  • Suitable in above 250 °F applications
  • Bolt’s end must protrude through the nut
    and 1 to 3 threads exposed to be in safety
35
Q

Shakeproof Lock Washer

A
  • Known also as an internal or external star washers
  • Used with bolts whenever the self locking or
    castellated type nut is not applicable
36
Q

Taper Pin

A
  • Designed to take shear loads and prevent any loose
    motion or play
    -Two Types: Threaded, Plain
37
Q

Roll Pin

A

A roll pin is a mechanical fastener that secures the position of two or more parts of a machine relative to each other

38
Q

Aircraft Screws: Classifications and (4) types

A

Structural screws, Machine screws, Self-tapping screws.

Torx, Slotted, Phillips, Allen

39
Q

Structural Screws

A
  • Heat treated steel alloy
  • Same shear strength as a bolt of
    the same diameter
  • Structural screws have an unthreaded portion (grip),
    same as a bolt.
40
Q

Machine Screws

A
  • No defined grip –threaded full length
  • Manufactured from: Low carbon steel, Brass,
    Corrosion - resistant steel, Aluminium alloy
41
Q

Self – Tapping Screws

A
  • “Type A” has a pointed end
  • “Type B” has a blunt end
  • Machine self-tapping screws: Roundhead, Countersunk
42
Q

Rivets

A
  • The most common method of fastening sheet metal

- Solid shank rivets (used in sheet metal), blind rivets

43
Q

1100 Rivet

A

Dimple markings on rivet head

44
Q

2017& 2024 Rivets

A
  • 2024 rivet is stronger and harder than 2017 rivet
45
Q

Keep 2017 and 2024 rivets refrigerated until ready to be driven.

A
  • Ice Box Rivets

- Refrigeration slows hardening process

46
Q

Mild Steel Rivet

A
  • Use with corrosion resistant steel parts
  • Designated with “F” in rivet code
  • No markings on a flat rivet head.
47
Q

Blind Rivet

A
  • Access available to only one end
    of rivet when driven
  • Limited space for bucking bar
  • Mechanical lock, self plugging rivet.
48
Q

Self – Plugging (Friction Lock) Rivet

A

Not suitable in vibration prone areas.

49
Q

Self – Plugging (Mechanical Lock) Rivet

A

Consists of 3 parts:
• Rivet head with a hollow shank
• Mechanical lock
• Steel stem

  • Suitable for vibration prone areas
50
Q

CamlocTM Fastener

A

To lock – turn stud clockwise quarter turn

To unlock - turn stud counter- clockwise quarter turn

Cert 2 Mechanical Engineering (2 decks)

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