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M6 Materials > Locking Devices > Flashcards

Locking Devices Flashcards

1
Q

Why is safteying important?

A

It ensures bolts, screws, nuts, pins and other fasteners do not shake loose during flight

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2
Q

In lockwire material identification, what does the letter code C represent?

A

CRES (Corrosion resistant steel)

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3
Q

What percentage of alloying elements are in CRES?

A

19% Chromium

9% Nickel

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4
Q

In lockwire material identification, what does the letter code F represent?

A

Carbon Steel (zinc plated)

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5
Q

What percentage of alloying materials are contained in zinc plated carbon steel

A

0.18-0.23% Carbon

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6
Q

In lockwire material identification, what does the letter code N represent?

A

Nickel Chromium Iron alloy

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7
Q

What percentage alloying elements does Nickel Chromium Iron alloy contain?

A

15.5% Chromium

8% Iron

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8
Q

In lockwire material identification, what does the letter code NC represent?

A

Nickel Chromium Alloy (Monel)

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9
Q

What percentage of alloying elements does Nickel Chromium alloy (Monel) contain?

A

30% Chromium

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10
Q

Only where can single-wire locking be used?

A

On small screws in a closely spaced closed geometrical pattern, on parts in electrical systems and in places difficult to reach

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11
Q

What method of wire locking is most common?

A

Double-twist

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12
Q

How is the number of twists per inch in locking wire determined?

A

Depends on the gauge of the locking wire and is given in the AMM Chapter 20

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13
Q

How do spring washers work

A
  • A single or double-coil spring washer fitter beneath nut.
  • Spring compresses when nut is tightened.
  • This sets up friction and preventing the nut from undoing.
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14
Q

What type of nut are tab washers suitable for?

A

Plain nut

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15
Q

How does a tab washer work?

A
  • One tab is bent against the flats of the nut

- The other tan is bent over an edge of the component or into a machined hole in the component

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16
Q

Can a tab washer be reused?

A

No

17
Q

How does a shakeproof washer work?

A
  • Has slanting serrations on it’s internal or external circumference
  • Angle allows nut to be tightened but serrations bite into it and prevent it coming undone
18
Q

Can a shakeproof washer be reused?

A

Yes, as long as it remains springy

19
Q

When are locking plates used?

A

In replacement of tab washers when bolt must be repeatedly removed

20
Q

How many times can split pins be used?

A

Once

21
Q

When can Centre punching/Burring be Used?

A

Only when detailed in the aircraft document set

22
Q

What do pip pins allow?

A

Rapid installation and removal of parts without tooling

23
Q

What is the difference between Ring pull decent pins and Double acting steel pins?

A

Double acting pins can be removed by pushing or pulling the ring handle, ring pull detent pins are simply pulled out

24
Q

What are the 4 principle parts of a Camloc fastener?

A
  1. Receptacle
  2. Grommet
  3. Retaining ring
  4. Stud assembly
25
Q

What 4 parts does a stud assembly consist of?

A
  1. Stud
  2. Cross pin
  3. Spring
  4. Spring cup
26
Q

Where are lightweight Camlocs usually used?

A

Internal, lightly loaded access panels

27
Q

What are the two types of Dzus fasteners and where are they used?

A

Light duty:
-Used in box covers, access hole covers and lightweight fairing
Heavy duty:
-Used in cowlings and heavy fairings

28
Q

What is the main difference between the two types of Dzus fastener?

A

The heavy duty Dzus fastener has a grommet

29
Q

What are the 2 types of Airloc fastener available?

A
  1. Fixed type

2. Floating type

30
Q

Where are stainless steel cotter pins (split pins) used ?

A

In locations where non-magnetic material is required

31
Q

What type of nut should be used with a cotter pin?

A

Castellated that have been drilled for the pin

M6 Materials (4 decks)

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