7.8

Question 1

What must 2017 (D) and 2024 (DD) rivets be before use?

Answer 1

Solution heat treated.

Partially softens material and prevents cracking

Question 2

What soak temperature are rivets heated to?

Answer 2

495 Celsius (+-5)

923 Fahrenheit

Question 3

What’s the maximum elapsed time for the transfer of rivets to the quench tank?

Answer 3

15 seconds.

Question 4

Why must rivets be refrigerated after heat treatment?

Answer 4

To delay the natural ageing process.

Question 5

What should the time not exceed between quenching to refrigeration of rivets?

Answer 5

2017 rivets= 30 minutes.

2024= 5 minutes

Question 6

Prior to refrigeration, what are heated rivets immersed in?

Answer 6

Isopropyl or ethyl alcohol at -20 Celsius or lower to remove water.

Question 7

How long can heated rivets be stored for?

Answer 7

7 days at -18 Celsius

20 days at -20 Celsius

Question 8

What’s the maximum number of heat cycles that can be performed on one rivet?

Answer 8

2

Question 9

How much bigger is a hole normally drilled than the rivet shank diameter?

Answer 9

0.1mm

Question 10

What does AN mean in terms of rivets?

Answer 10

Air Force Navy.

Question 11

What is the distance for PITCH for rivets?

Answer 11

4D

Question 12

What is the distance for SPACING for rivets?

Answer 12

4-5D

Question 13

What is the distance for EDGE MARGINS/LAND for rivets?

Answer 13

2-2.5D

Question 14

What distance is the SPHERE OF INFLUENCE for rivets?

Answer 14

5D

Question 15

What does the sphere of influence do for rivets?

Answer 15

Provides water tight joint.

Question 16

What is the allowance for a rivet?

Answer 16

The amount of protrusion of the rivet tail that is sufficient to form the shop head.

Question 17

What book is used for quick conversion?

Answer 17

Zeus book

Question 18

What’s the maximum permissible rivet spacing of a pressurised fuselage?

Answer 18

6D or 18T

Question 19

What’s the maximum rivet spacing of the wing structure for solid rivets?

Answer 19

3.75D

Question 20

What’s the maximum rivet spacing of the wing structure for hi-lok rivets?

Answer 20

4.5D or 10T

Whichever is smaller

Question 21

When is dimpling performed?

Answer 21

If the skin is too thin to countersink.

Question 22

What does coin dimpling do?

Answer 22

Gives the hole sharply defined edges.

100 degree angle, enabling skins to be stacked (nested)

Question 23

What does radius dimpling do?

Answer 23

Dimples formed do not have parallel sides, angle greater than 100 degrees.

Cannot be nested.

Question 24

What dimpling is used to tight locations?

Answer 24

Radius

Question 25

What material are hot dimpled?

Answer 25

Magnesium and some other hard aluminium alloys (7075) Too brittle and can crack.

Question 26

What are the 3 riveting methods?

Answer 26

Pneumatic gun Hand hammering Continuous squeeze riveting

Question 27

What is it called when a bucking bar is used to form an upset head?

Answer 27

Reaction riveting.

Question 28

What is the rivet set called which goes into the end of the rivet gun?

Answer 28

Rivet snap.

Question 29

What is hand hammering riveting also known as?

Answer 29

Percussion riveting.

Question 30

What do too many hammers on a rivet do when hand hammering?

Answer 30

Work hardens the rivet.

Question 31

What depth defects are acceptable on rivets?

Answer 31

Up to 0.10mm.

Question 32

What is the preferred method of riveting?

Answer 32

Squeeze.

Question 33

What is the hand method primarily used for?

Answer 33

Small repairs that include very few rivets.

Question 34

What is the optimum and maximum time for the formation of rivets?

Answer 34

3-4 seconds optimum 7 seconds maximum

Question 35

What would a large number of cracks in a high percentage of rivets indicate?

Answer 35

The rivets have not been heat treated correctly.

Question 36

What would be used to achieve a flush surface on a countersink rivet?

Answer 36

A microshaver.

Question 37

What is the measurement for the combined thickness of materials to be joined?

Answer 37

The grip length.

Question 38

What are 3 of the grip gauges?

Answer 38

Hi-Shear Visu-Lok Cherry

Question 39

What is a Jo-Bolt?

Answer 39

A high tensile steel, blind fastener.

Question 40

What head shape is on a Jo-Bolt?

Answer 40

Hexagon.

Question 41

What tool is a Jo-Bolt installed with?

Answer 41

Ratchet hand tool.

Question 42

What can only be used to remove a Jo-Bolt?

Answer 42

A drill.

Question 43

What is a more advanced version of a Jo-Bolt?

Answer 43

Visu-Lok II

Question 44

On standard Hi-Lok steel nuts, what is necessary when the outer surfaces on wings are more than 0.5 degrees out of parallel?

Answer 44

Spotfacing.

Question 45

On what Hi-Lok collars are an out of parallel condition of up to 3 degrees acceptable?

Answer 45

Standard aluminium alloy.

Question 46

How many degrees out of parallel is acceptable for Hi-Lok CRES collars?

Answer 46

0.5 degrees.

Question 47

How much lighter is a Hi-Lite fastener than a Hi-Lok?

Answer 47

Up to 15%

Question 48

What is the maximum run out all standard thread length pins require?

Answer 48

2 pitch.

Question 49

What makes a Hi-lite fastener lighter?

Answer 49

Shorter thread.

Question 50

What type of rivets are Cherrylock and Cherrymax?

Answer 50

Blind rivets.

Question 51

Where are cherrymax rivets effectively used?

Answer 51

Thin items or high vibration areas.

Question 52

What FOD is there when installing cherrymax rivets?

Answer 52

Driving anvil.

Question 53

Is there a driving anvil on a cherrylock?

Answer 53

No.