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AIRFRAME
J SHEET METAL STRUCTURES
| Question | Answer |
|---|---|
| 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, and DD rivets have a double dash. |
| WHAT MINIMUM EDGE DISTANCE AND SPACING SHOULD BE USED FOR A SINGLE ROW OF PROTUDING HAED RIVETS | For 5/32" or smaller diameter, use the next larger size 2117 rivet, assuming that 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 two rivet diameters from the edge and not less than three 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 while thick sheets may be 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 may be damaged, whereas a set with an over-sized radius 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 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 |
| What procedures should be followed to properly remove a solid-shank rivet? | center punch the rivet and the 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. |
| 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 two bends intersect to prevent cracking? | - Relief holes are drilled in the corner. |
| What are the two reasons for installing a lightening hole in a sheet metal wing rib? | Lightening holes reduce the weight and increase stiffness. |
| Describe a joggle and explain its 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 each other. |
| 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. |
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S_A_J