7.8

Question 1

What is the most common rivet angle

Answer 1

100 degrees

Question 2

How can countersink be shown

Answer 2

26 for csk
70 for universal

Question 3

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

Answer 3

4 is the diameter
5 is the length

Question 4

1100?.

Answer 4

A
Plain
Aluminium alloy

Question 5

2117

Answer 5

AD
A dimple
Copper

Question 6

5056

Answer 6

B
Cross
Buried
Magnesium
Prevents dissimilar corrosion

Question 7

2017?.

Answer 7

D
Dot
Lewis gets D in 2017
Copper

Question 8

2024?.

Answer 8

DD
Two dashes
Lewis gets double ds in 2024
Copper

Question 9

7050?.

Answer 9

Circle
E
Engagement ring
Zinc

Question 10

What should the diameter of the tail be on a tail

Answer 10

1.5D

Question 11

What is the Land and what is it normally

Answer 11

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

Question 12

What is the pitch and what is it normally

Answer 12

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

Question 13

What is the spacing and what is it normally

Answer 13

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

Question 14

What is the sphere of influence and what is it normally

Answer 14

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

Question 15

How is the rivet size for a sheet repair determined

Answer 15

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

Question 16

What rivets are cooked

Answer 16

2017 and 2024

Question 17

How long are rivets normally cooked for and at what temperature

Answer 17

30-45 mins
490 degrees c

Question 18

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

Answer 18

10 - 15 seconds
To prevent interganular corrosion

Question 19

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

Answer 19

To delay natural ageing process

Question 20

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

Answer 20

2024 - 5 mins
2017 - 30 mins

Question 21

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

Answer 21

-18 degrees c

Question 22

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

Answer 22

-20 degrees c

Question 23

How many heat treatment cycles can a rivet have

Answer 23

No more than 2

Question 24

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

Answer 24

6D

Question 25

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

Answer 25

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

Question 26

What are the three methods of dimpling

Answer 26

Coin Radius Hot

Question 27

What method of dimpling is preferred and why

Answer 27

Coin dimpling Allows for easy stacking and nesting

Question 28

How do you coin dimple on hard metals

Answer 28

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

Question 29

Why do we dimple

Answer 29

If the skin is too thin Causes knife edges if countersunk

Question 30

What are the three methods to countersink

Answer 30

Pneumatic rivet gun Hand hammer Squeezer

Question 31

What is the preferred method of riveting and why

Answer 31

Squeezing because it makes them all uniform is set up correctly

Question 32

If a rivet head is cracked what is it caused by

Answer 32

Incorrect heat treatment

Question 33

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

Answer 33

Max of 3 degrees

Question 34

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

Answer 34

0.5 degrees

Question 35

What is the advatange of a high lite and why

Answer 35

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

Question 36

What is the advantage if a cherry max and why

Answer 36

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

Question 37

What do you use to install a cherry lok

Answer 37

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

Question 38

What over size is a cherry lok rivet

Answer 38

1/64

Question 39

When do you use blind rivets

Answer 39

If you can’t get access to the rear