Metallic Aircraft Structures

Question 1

Define true monocoque:

Answer 1

A structure with bulkheads and formers for shape but ALL flight loads are carried in the sheet metal skin.

Question 2

Define semi-monocoque:

Answer 2

A structure in which MOST of the strength is in the skin, but the skin is supported on a substructure of formers and stringers.

Question 3

4 main structural components that form the shape of and provide rigidity to the skin of the aircraft.

Answer 3

Bulkhead
Longeron
Stringer
Former

Question 4

The maximum amount of tensile load a material can withstand without being permanently deformed:

Answer 4

Elastic limit

Question 5

5 basic stresses:

Answer 5

Tensile
Torsion
Sheer
Compression
Bending

Question 6

Alloy type 1xxx =

Answer 6

Aluminum

Question 7

Alloy type 2xxx =

Answer 7

Copper

Question 8

Alloy type 3xxx =

Answer 8

Manganese

Question 9

Alloy type 4xxx =

Answer 9

Silicon

Question 10

Alloy type 5xxx =

Answer 10

Magnesium

Question 11

Alloy type 6xxx =

Answer 11

Magnesium and silicon

Question 12

Alloy type 7xxx =

Answer 12

Zinc

Question 13

Aluminum alloy temper designation “F” =

Answer 13

The metal has been left as fabricated.

Question 14

Aluminum alloy temper designation “T” =

Answer 14

The metal may be heat treated.

Question 15

Aluminum alloy temper designation “H” =

Answer 15

Cannot be heat treated but can be hardened by cold working.

Question 16

Aluminum alloy temper designation “O” =

Answer 16

Metal has been annealed.

Question 17

4 different heat treatment processes:

Answer 17

Solution heat treatment.
Aging.
Precipitation heat treatment.
Annealing.

Question 18

Annealing does what to the aluminum alloy?

Answer 18

Makes it soft, but also weak.

Question 19

Strength of the rivet is called _____.

Answer 19

Sheer strength.

Question 20

Strength of the riveted sheet metal is called ______.

Answer 20

Bearing strength.

Question 21

T/F
Clad aluminum alloy is stronger than unclad.

Answer 21

False.
Clad is weaker.

Question 22

Shortcomings of magnesium alloys:

Answer 22

Susceptibles to corrosion.
Brittle.
Flammable.

Question 23

Rivet 470 =

Answer 23

Universal head

Question 24

Rivet 426 =

Answer 24

Countersunk head.

Question 25

Rivet 430 =

Answer 25

Round head.

Question 26

Rivet 442 =

Answer 26

Flat head.

Question 27

Icebox rivets are made of which two alloys?

Answer 27

2017 2024

Question 28

Rivet with raised dot =

Answer 28

2017T Field code - D Icebox

Question 29

Rivet with raised double dash

Answer 29

2024T Icebox Field code - DD

Question 30

Rivet with recessed dot =

Answer 30

2117T Field code - AD

Question 31

Rivet with raised cross =

Answer 31

High magnesium 5056H Field code - B

Question 32

AD =

Answer 32

2117T Recessed dot

Question 33

A =

Answer 33

1100 Plain (no marking)

Question 34

D =

Answer 34

Icebox 2017T Raised dot

Question 35

DD =

Answer 35

Icebox Raised double dash 2024T

Question 36

B =

Answer 36

High magnesium 5056H Raised cross.

Question 37

A fastener that provides a threaded hole in a piece of thin sheet metal:

Answer 37

Rivnut

Question 38

List the cleco colors and their corresponding rivet sizes.

Answer 38

Silver - 3/32 Copper - 4/32 Black - 5/32 Brass - 6/32 Copper - 8/32

Question 39

Rivet diameter =

Answer 39

3x thickness of the thickest sheet being joined.

Question 40

Edge distance tolerance =

Answer 40

2x - 4x diameter

Question 41

Rivet pitch tolerance =

Answer 41

3 - 12x diameter

Question 42

Transverse pitch =

Answer 42

Same as pitch if even rows. 75% of pitch if staggered rows.

Question 43

Extra shank of rivet when put through sheet metal holes should be ______.

Answer 43

1.5x diameter.

Question 44

Dimensions of rivet head when driven:

Answer 44

1.5x wide. .5x tall.

Question 45

Two types of aircraft structures:

Answer 45

Stressed skin. Truss type.

Question 46

Three categories of stressed skin aircraft:

Answer 46

Monocoque. Semi-monocoque. Reinforced shell structure.

Question 47

Purpose of formers:

Answer 47

Vertical pieces that form the shape of the structure.

Question 48

Purpose of longeron:

Answer 48

Provide longitudinal support of an aircraft structure.

Question 49

Purpose of a bulkhead:

Answer 49

Separate the major compartments of an aircraft structure.

Question 50

Name the structural components of a wing and their purposes.

Answer 50

Spar- the load bearing member in leading and trailing edge. Ribs- join the spars and form the wing curvature. Stringers- connect the ribs.

Question 51

Define tension.

Answer 51

The pulling apart of a component.

Question 52

Define compression.

Answer 52

The pushing force on a part from both sides.

Question 53

Define torsion.

Answer 53

A combination of compression and tension forces on a component.

Question 54

Purpose of cladding:

Answer 54

To protect the metal from air and water - preventing corrosion.

Question 55

Purpose of alodining:

Answer 55

Chemically creates an oxide film.

Question 56

Purpose of priming a part:

Answer 56

Bonds paint to alodined material.

Question 57

Tools needed to rivet:

Answer 57

Bucking bar. Rivet gun. Correct sets for the rivet being used.

Question 58

E =

Answer 58

Raised circle. Zinc. 7050 T73.