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M7 > 7.8 > Flashcards

7.8 Flashcards

1
Q

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

A

Solution heat treated.

Partially softens material and prevents cracking

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2
Q

What soak temperature are rivets heated to?

A

495 Celsius (+-5)

923 Fahrenheit

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3
Q

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

A

15 seconds.

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4
Q

Why must rivets be refrigerated after heat treatment?

A

To delay the natural ageing process.

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5
Q

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

A

2017 rivets= 30 minutes.

2024= 5 minutes

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6
Q

Prior to refrigeration, what are heated rivets immersed in?

A

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

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7
Q

How long can heated rivets be stored for?

A

7 days at -18 Celsius

20 days at -20 Celsius

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8
Q

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

A

2

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9
Q

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

A

0.1mm

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10
Q

What does AN mean in terms of rivets?

A

Air Force Navy.

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11
Q

What is the distance for PITCH for rivets?

A

4D

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12
Q

What is the distance for SPACING for rivets?

A

4-5D

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13
Q

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

A

2-2.5D

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14
Q

What distance is the SPHERE OF INFLUENCE for rivets?

A

5D

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15
Q

What does the sphere of influence do for rivets?

A

Provides water tight joint.

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16
Q

What is the allowance for a rivet?

A

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

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17
Q

What book is used for quick conversion?

A

Zeus book

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18
Q

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

A

6D or 18T

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19
Q

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

A

3.75D

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20
Q

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

A

4.5D or 10T

Whichever is smaller

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21
Q

When is dimpling performed?

A

If the skin is too thin to countersink.

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22
Q

What does coin dimpling do?

A

Gives the hole sharply defined edges.

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

23
Q

What does radius dimpling do?

A

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

Cannot be nested.

24
Q

What dimpling is used to tight locations?

A

Radius

25
Q

What material are hot dimpled?

A

Magnesium and some other hard aluminium alloys (7075)

Too brittle and can crack.

26
Q

What are the 3 riveting methods?

A

Pneumatic gun
Hand hammering
Continuous squeeze riveting

27
Q

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

A

Reaction riveting.

28
Q

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

A

Rivet snap.

29
Q

What is hand hammering riveting also known as?

A

Percussion riveting.

30
Q

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

A

Work hardens the rivet.

31
Q

What depth defects are acceptable on rivets?

A

Up to 0.10mm.

32
Q

What is the preferred method of riveting?

A

Squeeze.

33
Q

What is the hand method primarily used for?

A

Small repairs that include very few rivets.

34
Q

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

A

3-4 seconds optimum

7 seconds maximum

35
Q

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

A

The rivets have not been heat treated correctly.

36
Q

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

A

A microshaver.

37
Q

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

A

The grip length.

38
Q

What are 3 of the grip gauges?

A

Hi-Shear
Visu-Lok
Cherry

39
Q

What is a Jo-Bolt?

A

A high tensile steel, blind fastener.

40
Q

What head shape is on a Jo-Bolt?

A

Hexagon.

41
Q

What tool is a Jo-Bolt installed with?

A

Ratchet hand tool.

42
Q

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

A

A drill.

43
Q

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

A

Visu-Lok II

44
Q

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

A

Spotfacing.

45
Q

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

A

Standard aluminium alloy.

46
Q

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

A

0.5 degrees.

47
Q

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

A

Up to 15%

48
Q

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

A

2 pitch.

49
Q

What makes a Hi-lite fastener lighter?

A

Shorter thread.

50
Q

What type of rivets are Cherrylock and Cherrymax?

A

Blind rivets.

51
Q

Where are cherrymax rivets effectively used?

A

Thin items or high vibration areas.

52
Q

What FOD is there when installing cherrymax rivets?

A

Driving anvil.

53
Q

Is there a driving anvil on a cherrylock?

A

No.

M7 (17 decks)

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