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M7 > 7.8 > Flashcards

7.8 Flashcards

1
Q

What is the most common rivet angle

A

100 degrees

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2
Q

How can countersink be shown

A

26 for csk
70 for universal

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3
Q

AN 470 4-5
What does the 4 and the 5 denote

A

4 is the diameter
5 is the length

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4
Q

1100?.

A

A
Plain
Aluminium alloy

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5
Q

2117

A

AD
A dimple
Copper

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6
Q

5056

A

B
Cross
Buried
Magnesium
Prevents dissimilar corrosion

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7
Q

2017?.

A

D
Dot
Lewis gets D in 2017
Copper

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8
Q

2024?.

A

DD
Two dashes
Lewis gets double ds in 2024
Copper

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9
Q

7050?.

A

Circle
E
Engagement ring
Zinc

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10
Q

What should the diameter of the tail be on a tail

A

1.5D

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11
Q

What is the Land and what is it normally

A

Centre if rivet to edge of material
2D to 2.5D x diameter of rivet

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12
Q

What is the pitch and what is it normally

A

Distance between centre to centre if rivets in the same row
Minimum is 4D

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13
Q

What is the spacing and what is it normally

A

Distance between fastener rows from centre of holes
4D to 5D

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14
Q

What is the sphere of influence and what is it normally

A

Area of sheet metal over which a rivet will achieve a water tight seel
5D

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15
Q

How is the rivet size for a sheet repair determined

A

3 x the diameter if the thickness of the thickest sheet being joined

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16
Q

What rivets are cooked

A

2017 and 2024

17
Q

How long are rivets normally cooked for and at what temperature

A

30-45 mins
490 degrees c

18
Q

How long should you take between removing from oven and quenching and why

A

10 - 15 seconds
To prevent interganular corrosion

19
Q

Why do we refrigerate rivets if we are not using them after quenching

A

To delay natural ageing process

20
Q

For 2024 and 2017 how long do you have from quench to freezer

A

2024 - 5 mins
2017 - 30 mins

21
Q

At what temperature can rivets be in a freezer for 7 days

A

-18 degrees c

22
Q

At what temperature can rivets be in a freezer for 20 days

A

-20 degrees c

23
Q

How many heat treatment cycles can a rivet have

A

No more than 2

24
Q

What is the rivet spacing on a pressurised fuselage to prevent inter-rivet buckling

A

6D

25
Q

What is the rivet spacing on a wing spacing to prevent inter-rivet buckling

A

3.75D for a solid rivet
4.5D for a hi- lok rivet

26
Q

What are the three methods of dimpling

A

Coin
Radius
Hot

27
Q

What method of dimpling is preferred and why

A

Coin dimpling
Allows for easy stacking and nesting

28
Q

How do you coin dimple on hard metals

A

Heat up the dyes to prevent cracking, known as hot or thermal dimpling

29
Q

Why do we dimple

A

If the skin is too thin
Causes knife edges if countersunk

30
Q

What are the three methods to countersink

A

Pneumatic rivet gun
Hand hammer
Squeezer

31
Q

What is the preferred method of riveting and why

A

Squeezing because it makes them all uniform is set up correctly

32
Q

If a rivet head is cracked what is it caused by

A

Incorrect heat treatment

33
Q

For a hi- lok what is the collar on an aluminium alloy rivet

A

Max of 3 degrees

34
Q

For a hi- lok what is the collar on an CRES rivet

A

0.5 degrees

35
Q

What is the advatange of a high lite and why

A

15% lighter than a high lok
Because the thread pitch run out - it only has 1

36
Q

What is the advantage if a cherry max and why

A

You can use any tool to install it because of the driving anvil

37
Q

What do you use to install a cherry lok

A

A specific tool to be installed
The locking collar and shear ring ensure it breaks of at the correct point

38
Q

What over size is a cherry lok rivet

A

1/64

39
Q

When do you use blind rivets

A

If you can’t get access to the rear

M7 (15 decks)

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