Aircraft Drawings

Question 1

1. What type of lines are used on aircraft drawings to indicate hidden views, centerlines, & alternate position lines?

Answer 1

Hidden view line is a medium width line made up of short dashes. It represents and edge that cannot be seen.

Center lines are thin lines composed of alternating long and short dashes. Indicate center of an object or center of a void.

Alternate position lines are medium width lines composed of one long and two short, evenly spaced dashes. Shows alternate position of a part.

Question 2

2. How are dimension lines shown on aircraft drawings?

Answer 2

Dimension lines are solid, and usually broken at midpoint for insertion of measurement indications.

Question 3

3. What is a sketch for a repair?

Answer 3

It is a basic drawing that shows specific information and provides minimum detail needed to manufacture a part.

Question 4

4. How may an aircraft drawing of a part be drawn to bring out pertinent details?

Answer 4

Draw a detailed view at a larger scale than the principal view

Question 5

5. What type of drawing is most helpful in troubleshooting a system?

Answer 5

A Schematic

Question 6

6. Define “tolerance” as used in aircraft drawings

Answer 6

Plus & minus allowable dimension of a part (+- .005 =.010)

Question 7

7. Define “clearance” as used in aircraft drawings

Answer 7

The dimension given for the space between parts

Question 8

8. What is a fuselage station number?

Answer 8

Distance from the datum measured in inches

Question 9

9. What information is given in the title block of a blueprint?

Answer 9

Drawing number, name of part or assembly, the scale, the date, the name of the firm, draftsman, checker, and the approving official

Question 10

10. Where is the title block usually found on an aircraft drawing?

Answer 10

Lower right corner

Question 11

11. Why are dimensions used, and how are they shown on the aircraft drawings?

Answer 11

Dimensions are solid narrow lines, broken at midpoint for the insertion of measurements

Question 12

12. How can a change to an aircraft drawing be identified?

Answer 12

By its revision letter (A,B,C,etc.)

Question 13

13. What is the “bill of materials” associated with aircraft blueprints?

Answer 13

List of materials & parts necessary for fabrication or assembly of component or system

Question 14

14. Why are symbols used by manufacturers when drawing aircraft blueprints?

Answer 14

Symbols are a type of shorthand

Question 15

15. What is an orthographic projection?

Answer 15

Illustrating a drawing by showing different views at right angles to each other, such as side and front views

Question 16

16. How many views are required to determine the shape of an object?

Answer 16

Three views: Front, right, and top

Question 17

17. What is the purpose of one view drawings?

Answer 17

For objects of uniform thickness, such as gaskets, shims, & plates