Airframe Chapter 02 Flashcards

0
Q

Name several methods for forming sheet metal.

A

Bending or folding, stretching, shrinking, bumping, and crimping.

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1
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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2
Q

What are the dimensions of a properly formed rivet head?

A

The head should be 1 1/2 times the shank diameter in width and 1/2 the shank diameter in height.

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3
Q

Describe the markings found on the head of A, B, D, AD, and DD rivets.

A

A rivets are plane, B rivets have a cross, D rivets have a raised dot, AD rivets have a dimple, and DD rivets have a double dash.

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4
Q

What happens to the stem of a self-plugging (friction lock) rivet when the rivet is installed?

A

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

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5
Q

Name at least three types of self-plugging mechanical lock rivets.

A

CherryMAX, CherryLOCK, OLYMPIC-LOK, and HuckLok rivets

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6
Q

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

A

CherryLOCK rivets require a tool for each different size and head shape, while one pulling tool will set any size CherryMAX rivet.

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7
Q

If a 2024 rivet must be replaced with a 2117 rivet, how do you determine the size to be used?

A

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

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8
Q

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

A

Shear

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9
Q

Describe the process for determining the total length of a solid rivet for a particular installation.

A

Add the grip length (thickness of the materials being joined) plus 1 1/2 times the rivet diameter.

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10
Q

What minimum edge distance and spacing should be used for a single row of protruding head rivets?

A

Not less than two rivet diameters from the edge and not less than three rivet diameters apart.

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11
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 while thick sheets may be countersunk.

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12
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.

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13
Q

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

A

If the radius of the set is too small, the rivet head may be damaged, whereas a set with an over-size radius may cause damage to the sheet metal.

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14
Q

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

A

If a bucking bar is too large or heavy it may be difficult to control and may cause damage to the surrounding structure, whereas a bucking bar that is too light will not properly upset the river before work hardening occurs.

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15
Q

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

A

Center punch the rivet and then drill just to the base of the rivet head with the same size or one size smaller drill. Once drilled, use a pin punch to tip off the rivet head and drive the remaining shank out of the hole while supporting the surrounding material

16
Q

What are the two special calculations that must be made when bending sheet metal?

A

Bend allowance and setback.

17
Q

What factors must be considered in order to determine setback?

A

The thickness of the metal and the bend radius.

18
Q

What is done to a corner where two bends interest to prevent cracking?

A

Relief holes are drilled in the corner.

19
Q

What are the two reasons for installing a lightening hole in a sheet metal wing rib?

A

Lightening holes reduce weight and increase stiffness.

20
Q

When repairing an all metal aircraft, how do you determine what metals should be used?

A

Always use metals of the same type and thickness as the original structure.

21
Q

Describe a joggle and explain its function.

A

A joggle is an offset formed at an intersection of two or more sheets of metal to allow the multiple sheet to be stacked flat against each other.