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Airframe Volume 1 > Sheet Metal Progressive Test > Flashcards

Sheet Metal Progressive Test Flashcards

1
Q

What are the three types of metal structures that exist in an aircraft shell

A

Monocoque
Semi-monocoque
Reinforced shell

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2
Q

What forms a monocoque structure

A

The bulkhead the former and the skin

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3
Q

What carries most the load on a monocoque structure

A

The thin metal skin 

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4
Q

What are the components that make up a semi monocoque structure

A

The bulkhead the stringers and the formers

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5
Q

What is a bulkhead

A

A structural partition that divides the future large of an aircraft in compartments or bays 

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6
Q

What is a former

A

An aircraft structural member used to give a fuselage its shape

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7
Q

What is a stringer

A

A part of an aircraft structure used to give the fuselage its shape and in types of structure to provide a small part of the fuselage strength. Formers give the fuselage is cross-sectional shape Between the formers 

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8
Q

What are the components that make up a reinforce shell Structure

A

It uses bulkhead formers and stringers but it also uses longeron‘s to help carry the sheet metal load

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9
Q

What is a longeron

A

The main longitudinal loadbearing member of an aircraft Fuselage

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10
Q

What provides the shape for the reinforce shell structure

A

The bulkhead formers and stringers

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11
Q

What is stress on an aircraft

A

A force set up with an object that tries to prevent an outside force from changing its shape

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12
Q

What is strain on an aircraft

A

A deformation or physical change in the material caused by stress

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13
Q

What is the materials elastic limit

A

The maximum amount of tensile load, in pounds per square inch, a material is able to withstand without being permanently deformed.

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14
Q

What is tension on an airplane

A

Tension is anything that tries to pull the object apart

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15
Q

What is compression on an aircraft structure

A

Compression tries to squeeze the ends of an object together or sheet metal together

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16
Q

What is torsion stress on an aircraft

A

Torsion is a combination of tension and compression acting on the same object the act at 90° to each other in a both acting at 45° of the shape

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17
Q

When an aircraft is sitting on the ground what is taking place across the wings

A

Compression is taking place on the top of the wings and tension is taking place underneath the wings 

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18
Q

What is shear stress

A

And sheer stress tries to slide an object apart it will try to pull an object in one direction while being pulled in another

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19
Q

What type of alloy is the most popular structural aluminum alloy

A

Alloy 2024

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20
Q

Where is alloy 7075 used

A

For high strength structural requirements it contains Zinc

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21
Q

What is a pure 99% aluminum represented as

A

1XXX

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22
Q

What is copper represented as

A

2XXX

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23
Q

What is manganese represented as

A

3XXX

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24
Q

What is silicon represented as

A

4XXX

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25
Q

What is magnesium represented as

A

5XXX

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26
Q

What is magnesium and silicone represented as

A

6XXX

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27
Q

What is zinc represented as

A

7XXX

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28
Q

What are the two classifications of aluminum alloys divided up into

A

Can it be heat treated or can it not

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29
Q

What is solution heat treatment

A

A type of heat treatment for non-ferrous metals in which the metal is heated in a furnace until it has a uniform temperature throughout. It is then removed and quenched in cold water. When the metal is hot the alloy element enter into a solid solution with a base metal to become part of its basic structure. When the metal is quench these elements are quickly locked into place.

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30
Q

What is determined as aging

A

When you let a metal sit for a period of several days and the metal gains harness and strength

31
Q

What is precipitation heat treatment

A

A method of increasing the strength of a heat treatment alloy. After the aluminum alloy has been solution heat treated by heating and quenching, it is returned to the oven and heated to a temperature lower than that is used for the initial heat treatment. It is held at this temperature for a specified period of time and then removed from the oven and allowed to cool slowly.

32
Q

What is a annealing of metal

A

By softening the metal by heating them up in an oven to a specified temperature and then cooling them down slowly in the furnace or in still air. annealing leaves the metal soft but in this weakest condition

33
Q

What does F mean for the metal temperature

A

The metal is left As fabricated. There has been no control over its temper. 

34
Q

What does T represent in the aluminum alloy tempered designations

A

T means the metal may be heat treated 

35
Q

What does H mean in the aluminum alloy temper designations

A

The metal cannot be heat treated but it can be hardened by cold working

36
Q

What does o mean in the aluminum alloy temper designation

A

O means the metal has been annealed

37
Q

What is clad aluminum

A

A sheet of aluminum alloy that has been coated Of pure aluminum Rolled on one or both of it surfaces for corrosion protection

38
Q

What is Alclad and pure clad

A

A register trade name for clad aluminum alloy

39
Q

What is anodizing

A

The electric process in which a hard, airtight, oxide film is deposited on aluminum alloy for corrosion protection

40
Q

What is Alodine

A

A register trade name for a popular conversation coding chemical used to produce a hard, airtight, oxide film on aluminum alloy for corrosion protection

41
Q

Why are magnesium alloys a bad decision when coming to important components of an aircraft structure

A

They are more susceptible corrosion and are more brittle and those are more likely to crack

42
Q

Why is titanium very difficult and not likely used on aircraft

A

Titanium is expensive and difficult to work with but its ability to retain strength when exposed to high temperatures made it popular material for construction of high-performance turbine powered aircraft

43
Q

What is a ferrous metal

A

Any metal that contains iron and has magnetic characteristics

44
Q

What is corrosion resistant steel

A

Corrosion resistant steel is sometimes called stainless steel, and is used in thin sheets for engine firewalls and exhaust system components. The main alloy element in this steel are chromium and nickel.

45
Q

How is the strength of metal measured in

A

Pounds per square inch of tensile strength

46
Q

How can you test the tensile strength with a piece of machinery

A

By using a Rockwell hardness tester

47
Q

What is yield strength

A

The amount of stress needed to permanently the deform a material

48
Q

What is ultimate tensile strength

A

The tensile strength required to cause a material to break or to continue to form under a decreasing load.

49
Q

What do you want to share first a rivet or the underlying metal

A

The rivet it should have a smaller sheer strength than the actual metal alloy

50
Q

What is bearing strength

A

The amount of pull needed to cause a piece of sheet metal to tear at the points at which it is held together with rivets. The bearing strength of a material is affected by boat it’s thickness and the diameter of the rivet.

51
Q

What is a MS 20470 rivet

A

This is a universal head rivet

52
Q

What is a MS 20426 rivet

A

This is a countersunk head rivet

53
Q

What is a MS 20430 river

A

A round head rivet

54
Q

What is a MS20442 rivet

A

A flat head rivet

55
Q

What is the rule of thumb for the river that you were choosing based off your material

A

The rivet should be made of the same material as sheet metal

56
Q

What are icebox rivets

A

A solid rivet made of 2017 or 2024 aluminum alloy. These rivets are too hard to drive in the condition they are received from the factory, and must be heat treated to soften them. They are heated in the furnace and then quenched in cold water. Immediately after clenching they are soft, but within a few hours of room temperature they become quite hard.

57
Q

What is the first number indicate after the MS 20470 rivet

A

The diameter given in 1/32 inch increments

58
Q

What does the second – after the MS20470 mean

A

It is the length measured in 1/16 inch increments

59
Q

What are solid rivets made of

A

They can be made of copper, stainless steel, and monel 

60
Q

What are the types of special fasteners

A

The friction lock cherry rivet the mechanical lot cherry rivet the threaded rivet and the high-strength pin rivet

61
Q

What are some typical layout tools for a sheet metal construction

A

A combination set which uses a scriber and a lever and a protractor head and a center head to figure out the length and to get the correct angles of the sheet metal
A steel scale a.k.a. the ruler that uses to measure the distance between two points
The divider also uses the transferring distances from a steel scale to a metal being laid out and for dividing a line into equal spaces

62
Q

What are some typical marking tools used for sheet metal work

A

Punches may be used you have a prick punch, center punch, transfer a punch, and a pin punch

63
Q

What are some typical cutting tools for sheet metal

A

The square is sheer a.k.a. what we used in the shop to cut the sheet metal with
The throatless shears A.k.a. similar to scissors cuts directly down the center

The scroll shears are used to cut irregular lines on the inside of a sheet without cutting through the edge

The bandsaw which uses a flat platform to cut the metal with a metal sawblade you can increase decrease speed and also tilt

The hacksaw which is the most widely used of all to cut the metal narrow they are about a half inch wide and are available about 10 and 12 inch Lanks

64
Q

What are some typical tools used to smooth out the side of metal or top

A

Files ranging from different sizes a handheld cutting tool used to remove a small metal metal with each stroke

65
Q

What is the most common type of chisel

A

The flat type

66
Q

What are the three types of files

A

The single cut file
The double cut file
And a vixen file

67
Q

What are some typical deburring tool

A

Files may be used also deburring tools

68
Q

What are twist drill made to drill size

A

To the thousands of the rivet or bolt hole 

69
Q

What is the shank of the drill bit

A

It is the shiny part of the drillbit that does not curve or dig into metal

70
Q

What is used to rivet

A

A rivet gun that uses a beehive spring set retainer to hold the blank rivet set in place
A bucking bar is also used it comes in many sizes and shapes and it’s typically a piece of steel or iron

71
Q

What holds the pieces of metal together after they have been drilled and ready for riveting

A

Cleco‘s hold the two pieces of metal together they can be used by Cleco pliers pushing down on a spring and relieving the spreader to fit into the hole

72
Q

What are compression rivet squeezers

A

A type of riveting gun that slowly comprises the river together these are typically used on places that are very accessible to many rows of rivets

73
Q

What is a hole finder

A

It is used to locate holes that has been underneath the structure where you cannot see

74
Q

What is a chip chaser

A

A small tool that is used to dig out chips in between tight areas that way two pieces of metal can sit flush

Airframe Volume 1 (6 decks)

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