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B1 Modules > Maintenance practices M7.8 > Flashcards

Maintenance practices M7.8 Flashcards

1
Q

What is the most common countersink angle

A

100°

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2
Q

How quickly must you quench a river after heat treating

A

No longer than 10-15 seconds to prevent intergranular corrosion

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3
Q

How long can you store rivets in the freezer

A

-18° 7 days
- 20° 20 days

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4
Q

What is a 470 rivet

A

Universal head

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5
Q

What is a 426 rivet

A

Countersunk head

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6
Q

How are rivet diameters measured

A

1/32 increments

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7
Q

How are rivet lengths measured

A

1/16 increments

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8
Q

What is rivet land

A

From the centre of the rivet to the edge of the material

2D-2.5D

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9
Q

What is rivet pitch

A

Centre of one rivet to the centre of the next

Min 4D

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10
Q

What is the spacing when talking about rivets

A

The spacing between rows of rivets

4D - 5D

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11
Q

What is the shpere of influence

A

5D

Guarantees a water tight joint

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12
Q

What is max spacing in a pressurised fuselage

A

6D

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13
Q

Coin dimpling is what angle

A

100°

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14
Q

What is the most common type of dimpling

A

Coin

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15
Q

When is dimpling used over countersinking

A

On material that is too thin to countersink

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16
Q

What is the most common cause of a cracked rivet tail

A

Incorrect heat treatment

17
Q

When drilling rives use a slightly smaller drill then the hole size

A

Yes

18
Q

What pin punch would be used to punch out the rivet after drilling

A

Same diameter as the diameter of the shank of the rivet

19
Q

How much weight is saved by using a hi lite over a hi lok

A

15%

20
Q

Where is the weight saved on a hi lite

A

Thread pitch run out

2 for hi lok 1 for hi lite

21
Q

When installing cherry locks can you use any tool

A

No must be a cherry tool because they don’t have the driving anvil

22
Q

When using cherry max can you use any air tool to install

A

Yes because they have the driving anvil to help the process

B1 Modules (19 decks)

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