Sheet Metal and Non-Metallic Structures Flashcards

1
Q

How do you determine the total length of a solid rivet for installation?

A

The grip length +1.5 x the rivet diameter.

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2
Q

What is done with the rivet head stem when a self plugging rivet is installed?

A

The stem is pulled until it snaps off and the remaning projecting part is trimmed flush with the head.

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3
Q

Give examples self plugging mechanical lock rivets.

A

CherryLOCK, CherryMAX, CherrySST, HulkLOCK and OLYMPIC-LOCK

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4
Q

What methods are used in forming sheet metal?

A

Shrinking, Stretching, Bumping, Crimping, Folding.

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5
Q

What factors are used to determine setback?

A

Bend radius and material thickness

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6
Q

What calculation must be made when bending sheet metal?

A

Bend Allowance and setback.

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7
Q

What must be done when two bends intersect to prevent cracking?

A

Relief holes are drilled at the intersection/corner.

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8
Q

What is a joggle?

A

Its the offset formed on a part to allow clearance for a sheet or another mating part.

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9
Q

What is the purpose of lightning holes cut in rib sections?

A

To reduce weight and increase stiffness.

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10
Q

Describe rivet head markings for A,B,D,AD and DD rivets:

A

A – Are Plain, B – Have a Cross, D – Have a Raised Dot, AD – Have a Dimple, DD – Have a double dash.

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11
Q

What are the correct dimensions on a properly formed rivet head.(shop head)

A

1 ½ the shank diameter and ½ the shank of diameter height.

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12
Q

How do you determine the proper material to be used for a repair of an all metal aircraft?

A

Use the same type and thickness of the material that was used in the original structure.

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13
Q

What is the single row spacing and edge distance for protunding head rivets?

A

Edge 2 x diameter; Spacing 3 x diameter.

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14
Q

Describe the criteria for replacement of a 2024 rivet with a 2117 rivet for general repairs.

A

For 5/32 or less diameter, use the next larger size rivet 2117 and the edge/spacing distance meet the minimum
requirements.

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15
Q

What is the major type of damage to aluminum structures that is caused by exposure to the weather?

A

corrosion

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16
Q

What is the difference between the tools required to pull a CherryLOCK rivet and a CherryMAX rivet?

A

CherryLOCK – Require a different tool for each rivet size.
CherryMAX – Same tool for all.

17
Q

How can a mechanic determine whether the countersink for a flush rivet should be dimpled or drilled?

A

By the thickness of the top sheet, thin sheets are dimpled and thick sheets may be countersunk.

18
Q

What action is taken to prevent cracks from forming while dimpling magnesium or some hard sheet
metals?

A

Hot dimpling equipment is used to preheat and soften the metal before the dimple is formed.

19
Q

What type of damage can occur when using a rivet set that does not properly fit the rivet?

A

The rivet head and the sheet metal may be damaged.

20
Q

Why is it important to use the proper bucking bar when performing sheet metal riveting?

A

Bucking bar too large or heavy – Difficult to control and you can damage the sheet metal.
Bucking bar too light – Will not properly upset the rivet before work hardening occur.

21
Q

What procedures should be followed to properly remove a solid-shank rivet?

A

Center punch the rivet and drill to the base of the rivet head using the same size oro ne size small drill, then use a pin
punch to tip off the rivet head.

22
Q

Which of the five stresses is the most common cause of rivet failure?

A

shear