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22 Cards in this Set
- Front
- Back
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What is the major type of damage to aluminum structures that is caused by exposure to the weather? |
Corrosion |
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Name several methods for forming sheet metal? |
Bending or folding, stretching, shrinking, bumping, and crimping |
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What are the dimensions of a properly formed rivet head? |
The head should be 1.5 times the shank diameter in width and half the shank diameter in height |
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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, and DD rivets have a double dash |
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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 |
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Name at least 3 types of self-plugging mechanical lock rivets |
CherryMax, CherryLock, Olympic-Locs, and Huck |
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What is the difference between tools required to pull a CherryLock rivet and a CherryMax rivet? |
CherryLock rivets require a tool for each different size head and shape, while one pulling tool will set any size CherryMax rivet |
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Which of the five stresses is the most common cause of rivet failure? |
Shear |
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If a 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, assuming the edge distance and spacing meet the minimum requirements |
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Describe the process for determining the total length of a solid rivet for a particular installation |
Add the grip length plus 1.5 times the rivet diameter |
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What minimum edge distance and spacing should be used for a single row of protruding head rivets? |
Not less than two rivet diameters from the edge and not less than three rivet diameters apart |
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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 while thick sheets may be countersunk |
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What action is taken to prevent cracks from foaming while dimpling magnesium or some hard sheet metals? |
Hot dimpling equipment is used to preheat and soften the metal before the dimple is formed |
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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 may be damaged, whereas a set with an oversized radius may cause damage to the sheet metal |
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Why is it important to use the proper size and weight bucking bar when preforming sheet metal riveting? |
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 rivet before work hardening occurs |
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What procedures should be followed to properly remove a solid-state rivet? |
Center punch the rivet then drill just to the base of the rivet head with the same size or one 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 |
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What are the two special calculations that must be made when bending sheet metal? |
Bend allowance and setback |
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What factors must be considered in order to determine setback? |
Material thickness and bend radius |
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What is done to a corner where two bends intersect to prevent cracking? |
Relief holes are drilled in the corner |
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What are the two reasons for installing lightening hole in a sheet metal wing rib? |
Reduces weight and increases stiffness |
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Describe a joggle and explain it's function |
A joggle is an offset formed at an intersection of two or more sheets of metal to allow the multiple sheets to be stacked flat against eachother |
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When repairing an all-metal aircraft, how do you determine what metals should be used? |
Always use metal of the same type and thickness as the original structure |
