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AIRFRAME 03
Sheet Metal & Non-Metallic Structures
| Question | Answer |
|---|---|
| What is done with the rivet head stem when a self-plugging rivet is installed? | It is drawn up into the rivet shank forming a plug in the hollow center of the rivet and continues until the excess portion of the steam breaks off at a groove |
| give an example of a self-plugging mechanical lock rive | CherryLOCK, CherryMAX, Cherry SST, Huck, Huck-Clinch, or HuckMAX |
| Describe the correct dimensions on a properly formed rivet head. | 1-1/2 diameter wide, 1/2 diameter tall |
| What is bonded honeycomb construction? | Two relatively thin, parallel face sheets bonded to and separated by a relatively think lightweight core |
| Name two core materials used in special applications of bonded honeycomb construction? | Kraft paper, thermoplastics, aluminum steel, titanium, aramid paper, fiberglass, carbon, or ceramics |
| Name two causes of delamination or debond of a honeycomb construction. | 1) Matrix Cracks, 2)High or low-energy impacts, 3) subject to repeated loading, 4) liquid ingression , 5)Manufacturing / production flaws |
| What is a potting compound repair used for in bonded honeycomb? | Hole filling |
| What is done with the damaged area in bonded honeycomb? | The damaged area must be removed |
| What will cause crazing in transparent plastic panels / windshields? | Stress, improper handling, and harmful cleaning solvents |
| What should be done to twist drills that are to be used for drilling completely through plexiglass? | Drill must be free from nicks & burrs that would affect the surface finish. Grind the drill with an included angle of 150°. The rake and angle should be zero inn order to scrape, and not cut |
| What calculation must be made when bending sheet metal? | Bend allowance & setback |
| What must be done when two bends intersect? | Relief holes are drilled at the intersection |
| What methods are used in forming sheet metal? | Shrinking, stretching, bumping, crimping, and folding |
| What is the purpose of lightning holes cut in rib sections? | To reduce weight |
| What factors are used to determine setback? | The radius of the bend & the thickness of the material |
| What is a joggle? | It is the offset formed on a part to allow clearance for a sheet or another mating part |
| How do you determine the total length of a solid rivet for installation? | Grip length plus 1.5 times the shank diameter |
| How do you determine the proper material to be used for a repair of an all metal aircraft? | Use the same type and thickness of the material that was used in the original structure |
| What is the single row spacing and edge distance for protruding head rivets? | Edge distance is two times the diameter; spacing is three times the diameter |
| Describe rivet head markings for A, B, D, AD, and DD rivets. | A) Plain(1100), B) Cross(5056), D) Tit(2024), AD) Dimple(2117), DD) Double Dash(2017) |
| Describe the criteria for replacement of a 2024 rivet with a 2117 rivet for general repairs. | For 5/32 or less diameter use the next larger size rivet(2117) assuming that spacing and edge distance meet minimum requirements |
Created by:
Chisum
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