Chapter 2 Section A (Airframe Textbook Unit 2)

1. The type of metal most often used in the construction of civilian aircraft is heat-treated _________________________ alloy

aluminum

2. The two basic types of sheet metal structure used for aircraft are:

a. ______________________________

b. ______________________________

monocque

semi-monocoque

16. Alclad is ________________(pure aluminum, an anti-corrosion primer) that is _________________(sprayed, rolled) onto the surface of heat-treated aluminum alloys

pure aluminum

rolled

17. In order to protect the alloy within an Alclad sheet and to prevent creation of potential stress points, the surface of aircraft sheet metal should be protected from _______________ and _______________

scratches

abrasion

18. When an aluminum alloy is heated to its critical temperature and quenched, it is ____________________ (solution or precipitation) heat treated

solution

19. Artificial aging is another name for _________________________ (solution or precipitation) heat-treatment

precipitation

20. Aluminum alloys may be _________________________(hardened or softened) by annealing

softened

21. Give the temper designation for each of these conditions:

a. As fabricated _________________________

b. Annealed _________________________

c. Solution heat treated _________________________

d. Solution heat treated and cold worked _________________________

e. Solution heat treated and artificially aged _________________________

f. Strain hardened to quarter-hard temper _________________________

g. Strain hardened to full-hard temper _________________________

a. -F

b. -O

c. -T4

d. -T3

e. -T6

f. -H12

g. -H16

22. Magnesium is _________________________(lighter or heavier) than aluminum

lighter

23. Three drawbacks to the use of magnesium as a structural material are:

a. ______________________________

b. ______________________________

c. ______________________________

a. cracks easily

b. corrodes easily

c. burns readily

24. Titanium is used in structural areas of jet transports where a high _______________ to ______________ ratio is required.

strength

weight

25. Because of it’s strength and resistance to corrosion, stainless steel is well suited for ___________(high or

low) temperature applications such as:

a. ______________________________

b. ______________________________

high

a. firewall

b. exhaust system

26. Aluminum alloy-faced honeycomb panels are useful as a structural material because of their:

a. ______________________________

b. ______________________________

c. ______________________________

a. high strength

b. light weight

c. stiffness

27. Three methods of corrosion prevention used on aluminum alloys are:

a. ______________________________

b. ______________________________

c. ______________________________

a. cladding with pure aluminum

b. covering with primer and paint

c. covering with and impenetrable oxide film

28. Three requirements for the formation of corrosion on aluminum alloy are:

a. ______________________________

b. ______________________________

c. ______________________________

a. An area of electrode potential difference

b. A conductive path between these areas

c. An electrolyte covering the surface

29. Pure aluminum _________________________(will or will not) corrode

will note

30. A protective oxide film may be formed on the surface of a piece of aluminum alloy by what two methods?

a. ______________________________

b. ______________________________

a. electrolytically

b. chemically