Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
22 Cards in this Set
- Front
- Back
What is the major type of damage to aluminum structures that is caused by exposure to the weather?
|
CORROSION
|
|
Name several methods for forming sheet metal.
|
Bending or folding, stretching, shrinking, bumping, and crimping.
|
|
What are the dimensions of a properly formed rivet head?
|
The head should be 1 1/2 times the shank diameter in width and 1/2 the shank diameter in height.
|
|
Describe the markings found on the heads of A,B,D,AD, and DD rivets.
|
A rivets are plain
B rivets have a cross D rivets have a raised dot AD rivets have a dimple DD rivets have a double dash |
|
What happens to the stem of a self-plugging (friction lock) rivet when the rivet is installed?
|
The stem is pulled until it snaps off and the remaining projecting part is trimmed flush with the head.
|
|
Name at least 3 types of self plugging mechanical lock rivets.
|
CHERRYMAX
CHERRYLOCK OLYMPIC LOK HUCKLOK |
|
What is the difference between the tools required to pull a CherryLOCK rivet and a CherryMAX rivet?
|
CherryLOCK rivets require a tool for each different size and head shape.
CherryMAX rivets use One pulling tool will set any size |
|
Which of the 5 stresses is the most common cause of rivet failure?
|
SHEAR
|
|
If the 2024 rivet must be replaced with a 2117 rivet, how do you determine the size to be used?
|
For 5/32 or smaller diameter, use the next larger size 2117 rivet, assuming the edge distance and spacing meet the minimum requirements.
|
|
Describe the process for determining the total length of a solid rivet for a particular installation.
|
Add the grip length (thickness of the materials being joined) plus 1 1/2 times the rivet diameter.
|
|
What minimum edge distance and spacing should be used for a single row of protruding head rivets?
|
Not less than 2 rivets diameters from the edge
and not less than 3 rivet diameters apart. |
|
How can a mechanic determine whether the countersink for a flush rivet should be dimpled or drilled?
|
By the thickness of the top sheet;
Thin sheets are dimpled Thick sheets are countersunk |
|
What action is taken to prevent cracks from forming while dimpling magnesium or some hard sheet metals?
|
Hot dimpling equipment is used to preheat and soften the metal before the dimple is formed.
|
|
What type of damage can occur when using a rivet set that does not properly fit the rivet?
|
If the radius of the set is too small the rivet head will be damaged.
If the set is over-sized it may cause damage to the sheet metal |
|
Why is it important to use the proper size and weight bucking bar when performing sheet metal riveting?
|
If bucking bar is too large or heavy it may be difficult to control and may cause damage to the surrounding structure
a bucking bar that is too light will not properly upset the rivet before work hardening occurs. |
|
What procedures should be followed to properly remove a solid-shank rivet?
|
1. Center punch the rivet head
2. drill just to the base of the rivet head with the same size or one size smaller drill 3. 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. |
|
What are the two special calculations that must be made when bending sheet metal?
|
Bend allowance and setback.
|
|
What factors must be considered in order to determine setback?
|
The thickness of the metal and the bend radius.
|
|
What is done to a corner where 2 bends intersect to prevent cracking?
|
Relief holes are drilled in the corner.
|
|
What are the 2 reasons for installing a lightening hole in a sheet metal wing rib?
|
Reduce weight & Increase stiffness
|
|
Describe a joggle and explain its function.
|
An offset formed at an intersection of 2 or more sheets of metal to allow multiple sheets to be stacked flat against each other.
|
|
When repairing an all-metal aircraft, how do you determine what metals should be used?
|
Always use the same type and thickness as the original structure.
|