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Airframe > Metallic Aircraft Structures > Flashcards

Metallic Aircraft Structures Flashcards

1
Q

Define true monocoque:

A

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

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2
Q

Define semi-monocoque:

A

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

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3
Q

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

A

Bulkhead
Longeron
Stringer
Former

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4
Q

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

A

Elastic limit

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5
Q

5 basic stresses:

A

Tensile
Torsion
Sheer
Compression
Bending

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6
Q

Alloy type 1xxx =

A

Aluminum

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7
Q

Alloy type 2xxx =

A

Copper

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8
Q

Alloy type 3xxx =

A

Manganese

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9
Q

Alloy type 4xxx =

A

Silicon

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10
Q

Alloy type 5xxx =

A

Magnesium

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11
Q

Alloy type 6xxx =

A

Magnesium and silicon

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12
Q

Alloy type 7xxx =

A

Zinc

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13
Q

Aluminum alloy temper designation “F” =

A

The metal has been left as fabricated.

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14
Q

Aluminum alloy temper designation “T” =

A

The metal may be heat treated.

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15
Q

Aluminum alloy temper designation “H” =

A

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

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16
Q

Aluminum alloy temper designation “O” =

A

Metal has been annealed.

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17
Q

4 different heat treatment processes:

A

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

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18
Q

Annealing does what to the aluminum alloy?

A

Makes it soft, but also weak.

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19
Q

Strength of the rivet is called _____.

A

Sheer strength.

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20
Q

Strength of the riveted sheet metal is called ______.

A

Bearing strength.

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21
Q

T/F
Clad aluminum alloy is stronger than unclad.

A

False.
Clad is weaker.

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22
Q

Shortcomings of magnesium alloys:

A

Susceptibles to corrosion.
Brittle.
Flammable.

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23
Q

Rivet 470 =

A

Universal head

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24
Q

Rivet 426 =

A

Countersunk head.

25
Q

Rivet 430 =

A

Round head.

26
Q

Rivet 442 =

A

Flat head.

27
Q

Icebox rivets are made of which two alloys?

A

2017
2024

28
Q

Rivet with raised dot =

A

2017T
Field code - D
Icebox

29
Q

Rivet with raised double dash

A

2024T
Icebox
Field code - DD

30
Q

Rivet with recessed dot =

A

2117T
Field code - AD

31
Q

Rivet with raised cross =

A

High magnesium
5056H
Field code - B

32
Q

AD =

A

2117T
Recessed dot

33
Q

A =

A

1100
Plain (no marking)

34
Q

D =

A

Icebox
2017T
Raised dot

35
Q

DD =

A

Icebox
Raised double dash
2024T

36
Q

B =

A

High magnesium
5056H
Raised cross.

37
Q

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

A

Rivnut

38
Q

List the cleco colors and their corresponding rivet sizes.

A

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

39
Q

Rivet diameter =

A

3x thickness of the thickest sheet being joined.

40
Q

Edge distance tolerance =

A

2x - 4x diameter

41
Q

Rivet pitch tolerance =

A

3 - 12x diameter

42
Q

Transverse pitch =

A

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

43
Q

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

A

1.5x diameter.

44
Q

Dimensions of rivet head when driven:

A

1.5x wide.
.5x tall.

45
Q

Two types of aircraft structures:

A

Stressed skin.
Truss type.

46
Q

Three categories of stressed skin aircraft:

A

Monocoque.
Semi-monocoque.
Reinforced shell structure.

47
Q

Purpose of formers:

A

Vertical pieces that form the shape of the structure.

48
Q

Purpose of longeron:

A

Provide longitudinal support of an aircraft structure.

49
Q

Purpose of a bulkhead:

A

Separate the major compartments of an aircraft structure.

50
Q

Name the structural components of a wing and their purposes.

A

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

51
Q

Define tension.

A

The pulling apart of a component.

52
Q

Define compression.

A

The pushing force on a part from both sides.

53
Q

Define torsion.

A

A combination of compression and tension forces on a component.

54
Q

Purpose of cladding:

A

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

55
Q

Purpose of alodining:

A

Chemically creates an oxide film.

56
Q

Purpose of priming a part:

A

Bonds paint to alodined material.

57
Q

Tools needed to rivet:

A

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

58
Q

E =

A

Raised circle.
Zinc.
7050 T73.

Airframe (8 decks)

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