Answers - Aircraft Metal Structure Repair


Fill in the Blanks

1. strong, cracks
2. shear, torsion
3. parallel, three
4. bearing, shear
5. parallel, double‐cut
6. shape, half‐round
7. pneumatic, electric
8. stops, underlying
9. bends
10. press, complex
11. feed, curvature
12. deburr, stretching
13. V‐blocks, flanges
14. thickness, temper
15. K‐factor, 90°
16. relief holes, tangent
17. excellent, feed
18. load
19. manufacturing, conventional
20. bulbed, locking (foil)
21. regulated, torque
22. aluminum, clearance
23. sleeves, protruding
24. less, thickest
25. pitch, adjacent
26. knife‐edge, enlarging
27. perpendicular, weight
28. spar, strength
29. rivet gage
30. hot, flow

Knowledge Application

1‐1. d, 1‐2. c, 1‐3. f, 1‐4. e, 1‐5. a, 1‐6. b, 1‐7. a, 1‐8. f, 1‐9. e, 1‐10. c, 1‐11. b

2‐1. l, 2‐2. c, 2‐3. i, 2‐4. q, 2‐5. f, 2‐6. a, 2‐7. e, 2‐8. o, 2‐9. g, 2‐10. d, 2‐11. p, 2‐12. j, 2‐13. m, 2‐14. r, 2‐15. b, 2‐16. h, 2‐17. n, 2‐18. k

3‐1. d, 3‐2. f ,3‐3. b, 3‐4. g, 3‐5. a, 3‐6. i, 3‐7. e, 3‐8. h, 3‐9. c

4‐1. c, 4‐2. a, 4‐3. e, 4‐4. d, 4‐5. g, 4‐6. b, 4‐7. f

5‐1. e, 5‐2. a, 5‐3. c, 5‐4. f, 5‐5. b, 5‐6. d

6‐1. h, 6‐2. l, 6‐3. d, 6‐4. p, 6‐5. i, 6‐6. n, 6‐7. f, 6‐8. a, 6‐9. k, 6‐10. b, 6‐11. o, 6‐12. n, 6‐13. j, 6‐14. g, 6‐15. m, 6‐16. c

7‐1. f , 7‐2. b, 7‐3. e, 7‐4. a, 7‐5. d, 7‐6. c

8‐1. b, 8‐2. e, 8‐3. a, 8‐4. d, 8‐5. g, 8‐6. c, 8‐7. f, 8‐8. f, 8‐9. c, 8‐10. g, 8‐11. e, 8‐12. b, 8‐13. a

9‐1. 2D, 9‐2. 2D + 1/16”, 9.3. 2.5D, 9‐4. 2.5D + 1/16”

10‐1. 3D, 10‐2. 3D + 1/16”, 10‐3. 4D, 10‐4. 4D + 1/16”, 10‐5. 3.5D, 10‐6. 3.5D + 1/16”, 10‐7. 4.5D, 10‐8. 4.5D + 1/16”

Multiple Choices

1. c
Rivets hold pieces of aircraft skin together, and in a properly designed riveted joint, the rivets support shear loads only.

2. b
Huckbolts and Lockbolts are manufactured to the same Federal Standard. In each case, the tension-type has 4 to 5 locking grooves and the shear-type has 2.

3. b
The 2117-T rivet, known as the field rivet, is used more than any other for riveting aluminum alloy structures. The field rivet is in wide demand because it is ready for use as received, and needs no further heat treating or annealing.

4. a
As a general rule, the rivet diameter should be not less than three times the thickness of the thickest sheet being riveted.

5. a
A properly formed shop head is one-half the shank diameter high, its diameter is one-and-one-half times that of the shank, and it is concentric with the hole.

6. c
The hand tools used for installation of Hi-Loks are an open end wrench and hex key (allen wrench).

7. c
When working with Dzus fasteners, it is worthwhile to know that the body diameter, length, and head type may be identified by the markings found on the head of the stud.

8. c
The length of a Dzus fastener is measured in hundredths of an inch and is the distance from the head of the stud to the bottom of the spring hole.

9. a
The diameter of a Dzus fastener is always measured in sixteenths of an inch.

10. c
Rivnuts are a combination of rivet and nut. A hole is drilled through the skin and the Rivnut, which resembles a hollow rivet with threads inside its shank, is slipped into the hole and upset with a special puller.

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