M7.12 Flashcards

1
Q

What is used to change direction of chains?

A

Sprockets and bi-planar blocks

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2
Q

What standards do chains have to follow for aircraft use?

A

British standards 228

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3
Q

What is pitch of a chain?

A

The distance between the centre of the rollers

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4
Q

What must be remembered about new chains?

A

They come pre-lubricated and the lubrication should be kept on

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5
Q

How do non-reversible chains work?

A

Every second outer plate is extended in one direction so it cant go in the guard if incorrect

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6
Q

What should be done if corrosion is found on a chain?

A

It should be replaced

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7
Q

At what points should chains be take apart?

A

At breakdown points

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8
Q

When would you proof-loading a chain?

A

When you remove a small part of a long chain

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9
Q

What percentage of elongation should a chain be replaced?

A

2% on any section

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10
Q

How should chains be stored?

A

In a bath of oil or if not required immediately then coiled up in greaseproof paper

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11
Q

What are the five types of gears?

A
  • spur gears
  • helical gears
  • bevel gears
  • hypoid gears
  • worm gears
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12
Q

What is the advantages of having angled teeth on a gear?

A

They transmit higher force and they are quieter

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13
Q

What is backlash?

A

The amount of play between teeth on gears

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14
Q

What is backlash tolerance?

A

The allowable amount of backlash

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15
Q

What is the purpose of backlash?

A

To prevent jamming and to make contact on both sides of the tooth at the same time

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16
Q

How do you measure backlash in a gear train?

A

By locking an end gear and then measure the limits of movement at the other (measurement done by DTI)