Metallic Structure

Question 1

Name at least three types of self plugging mechanical lock rivet?

Answer 1

CherryLOCK - CherryMAX -OlympicLOK HuckLOCK

Question 2

What is the difference between the tool required to pull a CherryLock rivet and CherryMAX rivet?

Answer 2

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

Question 3

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

Answer 3

Shear stress

Question 4

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

Answer 4

For a 5/32 inch or smaller diameter use the next larger size of 2117 assuming that the edge distance and spacing meet the minimum requirement

Question 5

Describe the process to determine the total length of a solid rivet for a particular installation?

Answer 5

Add the grip length (thickness of the material being joint) plus 1 1/2 times rivet diameter

Question 6

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

Answer 6

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

Question 7

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

Answer 7

By the thickness of the top sheet, thin sheet are dimpled while a thick sheet may be countersink

Question 8

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

Answer 8

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

Question 9

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

Answer 9

If the radius of the set is too small, it will damage the rivet.
If the set is oversize it will damage the sheet metal

Question 10

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

Answer 10

If a buckling bar is too large or heavy, it will be hard to control and may cause damage to the surrounding areas.
If the buckling bar is light it will not properly upset the rivet before work hardening occur

Question 11

What happens to the stem of a self plugging rivet when the rivet is installed?

Answer 11

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

Question 12

Describe the marking found on the head of A, B, D, AD, DD, and E rivets?

Answer 12

A= plain rivet
B= Rivet have a cross
D= Rivet has a raised dot
AD= Rivet have a dimple
DD= Rivet have a double dash
E = Rivet have a raised ring

Question 13

What are the dimensions of a properly formed rivet head?

Answer 13

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

Question 14

Name several methods of forming sheet metal?

Answer 14

1- Bending 2- Stretching 3- Shrinking 4-Bumping 5- crimping

Question 15

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

Answer 15

Corrosion

Question 16

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

Answer 16

Center punch the rivet and than 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 metal

Question 17

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

Answer 17

Always use metal of the same type and thickness of the original structure

Question 18

Describe a joggle and explain its function?

Answer 18

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

Question 19

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

Answer 19

lightening hole reduces the weight and increase stiffness

Question 20

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

Answer 20

Relief hole is drilled in the corner

Question 21

what factors must be considered in order to determine set back?

Answer 21

Bend radius and thickness of the metal

Question 22

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

Answer 22

Set back and bend allowance