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Airframe 15% Of Test... > Sheetmetal And Nonmetallic Structures > Flashcards

Sheetmetal And Nonmetallic Structures Flashcards

1
Q

A well designed rivet joint will be subject the rivets to

A

Shear loads

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2
Q

The main difference between lockbolt and huckbolt tension and shear fasteners, other than their application, is in the

A

Number of locking collar grooves

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3
Q

Alloy 2117 rivets are heat treated

A

By the manufacturer and do not require heat treatment before being driven

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4
Q

The general rule for finding the proper rivet diameter is?

A

Three times, the thickness of the thickest sheet being riveted

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5
Q

The shop head rivet should be

A

One and one half times the diameter of the rivet shank

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6
Q

One of the main advantages of HI-lok type fasteners over earlier generations is that

A

They can be installed with ordinary hand tools

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7
Q

Which of the following is one advantage hi-lok fasteners

A

Inability to be overtorqued

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8
Q

The markings on the head of a dzus fastener identify the

A

Body diameter, type of head, and length of the fastener

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9
Q

The Dzus turn lock fastener consists of a stud and grommet receptacle, the stud is measured in

A

Hundredths of an inch

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10
Q

The dzus turn lock fastener consists of a stud grommet and a receptacle
The stud diameter is measured in

A

Sixteenths of an inch

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11
Q

Threaded rivets [rivnuts] are commonly used to

A

Attach parts or components with screws to a sheet of metal

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12
Q

The instalation of a cherry max and Olympic-lok rivets is accomplished by utilizing

A

A pulling tool

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13
Q

Hole filling fasteners (for 3xaple MS20470 rivets) should not be used in composite structures primarily because of the

A

Possibility of causing delamination

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14
Q

Metal fasteners, used with carbon/graphite composite structures

A

Must be constructed of a material such as titanium or corrosion resistant steel

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15
Q

Sandwich panels made of honeycomb construction are used on aircraft because this type of construction

A

Saves weights while not compromising strength

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16
Q

Which of these methods may be used to inspect fiberglass/honeycomb structures for entrapped water

A

Xray/and blacklighting

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17
Q

When balsa wood is used is used to replace a damaged honeycomb core, the plug should be cut, so that

A

The grain is perpendicular to the skin

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18
Q

When repairing puncture type damage to a metal faced laminated honeycomb panel, the edges of the doubler should be tapered

A

100 times the thickness of the metal

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19
Q

One of the best ways to assure that a properly prepared patch of matrix resin has been achieved is to

A

Have a mixed enough for a test sample

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20
Q

How does acoustic emissions testing detect defects in composite materials

A

By picking up the noise of any deterioration that may be present

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21
Q

When conducting a tap test on a composite panel, which of the following would indicate delamination

A

Dull thud

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22
Q

What precaution if any should be taken to prevent corrosion inside a repaired metal honeycomb structure

A

Prime the repair with a corrosion inhibitor and seal from the atmosphere

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23
Q

One method of inspecting a laminated fiberglass structure that has been subjected to damage is to

A

Strip the damaged area of all paint and shine a strong light through the structure

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24
Q

When inspecting a composite panel using the ring test/tapping method, a dull thud may indicate

A

Separation of the laminates

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25
Q

Which of the following are benefits of using micro-balloons when making repairs to laminated honeycomb panels

A

Improved strength to weight ratio, less density and lower stress concentration

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26
Q

The length of time that a catalyzed resin will remain in a workable state is called the

A

Pot life

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27
Q

A category of plastic material that is capable of softening or flowing when reheated is described as a

A

Thermoplastic

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28
Q

The classification, for high tensile strength fiber glass used in aircraft structures is

A

S-glass

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29
Q

Which is an identifying characteristic of acrylic plastic?

A

Zinc chloride will have no effect

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30
Q

Superficial scars, scratches, surface abrasion, or rain erosion on fiver glass laminates can generally be repaired by applying

A

One or more coats of suitable resin (at room temperature catalyzed) to the surface

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31
Q

The classification for fiberglass reinforcement material that has a resistivity and is the most common is

A

E-glass

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32
Q

A potted compound repair on honeycomb can usually be made on damages less than

A

1 inch in diameter

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33
Q

Composite fabric material is considered to be the strongest in what direction?

A

Warp

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34
Q

What references tool is used to determine how the fiber is oriented for a particular ply of fabric

A

Warp clock(or compass)

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35
Q

The strength and stiffness of a properly constructed composite buildup depend primarily on

A

The orientation of the plies to the load direction

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36
Q

Which fiber to resin (percent) ratio for advanced composite wet layups is generally considered the best for strength

A

60:40 fiver to resin ratio

37
Q

What is the material layer used within the vacuum bag pressure system to absorb excess resin during curing called

A

Bleeder

38
Q

Proper prepreg composite layup curing is generally accomplished by

A

Applying external heat and pressure

39
Q

When repairing large, flat surfaces with polyester resin, warping of the surface is likely to occur. One method of reducing the amount of warpage is to

A

Use short strips of fiberglass in the bonded repair

40
Q

When making repairs to fiberglass, cleaning the area to be repaired is essential for a good bond. The final cleaning should be made using

A

MEK/methyl ethyl ketone

41
Q

When necessary, what type of cutting fluid is usually acceptable for machining composites laminates

A

Water only

42
Q

Fiberglass laminates

A

Filling with a putty consisting of a compatible resin and clean short glass fibers

43
Q

Fiberglass damage that extends completely through a laminated sandwich structure

A

May be repaired

44
Q

Fiberglass laminate damage that extends completely through one facing and into the core

A

Requires the replacement of the damaged core and facing

45
Q

Repairing advanced composites, using materials and techniques traditionally used for fiberglass repairs, is likely to result in

A

An unairworthy repair

46
Q

The preferred way to make permanent repairs on composites is by

A

Laminating on new repair plies

47
Q

Which of the following is added to wet resins provide strength for the repair of damaged fastener holes in composite panels

A

Flox and chopped fibers

48
Q

The part of a replacement honeycomb core that must line up with the adjacent original is the

A

Ribbon Direction

49
Q

Which of the following are generally characteristic of aramid fiber (kevlar) composites

A

High tensile strength and flexibility

50
Q

Which of the following are generally characteristics of carbon/graphite fiber composites?

A

Stiffness, high compressive strength, and corrosive effects in contact with aluminum

51
Q

If an aircraft transparent plastic enclosure exhibits fine cracks, which may extend in a network over or under the surface or through the plastic, the plastic is said to be

A

Crazing

52
Q

When installing transparent plastic enclosures that are retained by bolts extending through the plastic material and self-locking nuts the nuts should be

A

Tighned to a firm fit, then backed off one full turn

53
Q

If a new safety belt is to be installed in an aircraft, the belt must conform to the strength requirements in which document

A

TSO C22

54
Q

Which is considered good practice concerning the installation of acrylic plastics

A

When rivets are used adequate spacer or other satisfactory means to prevent excessive tightening

55
Q

The coefficient of most plastic enclosed materials is

A

Greater than both steel and aluminum

56
Q

If no scratches are visible after transparent plastic enclosure, mayerials have been cleaned their surface should be

A

Covered on a thin coat of wax

57
Q

Cabin upholstery materials installed in current standard category airplanes must

A

Be at least flame resistant

58
Q

What is the most common method of cementing transparent plastics

A

Soak method

59
Q

What type of bit should be used to drill holes in plexiglass

A

A specially modified twist drill

60
Q

Which of the following drill bit types work best when drilling an aramid fiber (kevlar) composite laminates

A

Carbon W-point

61
Q

What is the purpose of a gusset(plate) used in the construction and repair of aircraft structures

A

To join and reinforce intersecting structural members

62
Q

Select the alternative that best describes the function of the flute section of a twist drill bit

A

Forms of cutting edges of the drill point

63
Q

How many MS204070 AD-4-6 rivets will be required to attach a plate using a single row of rivets, minimum edge distance, and 4D spacing

A

56 rivets
1/8 in diameter

64
Q

On a semi-monocoque fuselage, the skin is reinforced by longitudinal structural members called

A

Longerons and stringers

65
Q

Shallow scratches in sheet metal may be repaired by

A

Burnishing

66
Q

What could be the included angle of twist drill for soft metals

A

90*

67
Q

When comparing the machining technique for stainless steel material to those for aluminum alloy sheets, it is normally considered good practice to drill the stainless steel at

A

Lower speed with more pressure applied to the drill

68
Q

A single lap sheeplt splice is to be used to repair a section of damaged aluminum skin. If a double row of 1/8 in rivets is used, the minimum allowable overlap will be

A

13/16 inch

69
Q

What is the minimum edge distance allowed for aluminum alloy single lap sheet splices containing a single row of rivets as compared to a joint with multiple rows all rivets being equal in diameter

A

The minimum edge distance for the single row is equal to that for the multiple row

70
Q

This statement is true regarding the inspection of a stressed skin metal Qing assembly known to have been critically loaded

A

If Ginuwine rivet tipping has occurred, groups of consecutive rivets will be tipped in the same direction

71
Q

What is the minimum edge distance for aircraft rivets?

A

Two times the diameter of the rivet shank

72
Q

When drilling a stainless steel, the drill used should have an included angle of

A

140* and turn at a low speed

73
Q

What is the minimum spacing for a single row of aircraft rivets

A

Three times the diameter of the rivet shank

74
Q

Which is the correct concerning the use of a file?

A

Apply pressure on the forward stroke, only, except when filing very soft metals such as lead or aluminum

75
Q

What is one of the determining factors that permits machine countersinking when flush riveting

A

The thickness of the material is greater than the thickness of the rivet head, which gives enough strength to countersink

76
Q

Qhwn repairing a small hole on a metal stressed skin the major consideration is the design of the patch should be?

A

The shear strength of the riveted joints

77
Q

Which procedure is correct when utilizing a reamer to finish a drilled hole to the correct size

A

Turn the reamer only in the cutting direction

78
Q

Repairing or splices involving stringers on the lower surface of stressed skin metal wings are usually

A

Permitted but are normally more critical on reference to strength in tension that similar repairs to the upper surface

79
Q

When straightening members of 2024-T4 you should

A

Straightening cold and reinforce

80
Q

Clad aluminum alloys are used in aircraft because they

A

Have surface layers of pure aluminum/alloy bonded to the core material to inhibit corrosion

81
Q

Which statement is true regarding a cantilever wing

A

No external bracing is needed

82
Q

Aircraft structural units such as spars engine supports,betc. Which have been built up from sheet metal are normally

A

Repairable, using approved methods

83
Q

A factor that determines the minimum space between rivets is the

A

Diameter of the rivets being used

84
Q

What should be the included angle of a twist drill for hard metal?

A

118*..

85
Q

Parts fabricated from alclad 2024-T3 aluminum sheet stock must have all

A

Scratches kinks tool marks nicks, etc
Held to a minimum!!!

86
Q

The monocoque fuselage relies largely on the strength of

A

The skin or covering of the plane/heli

87
Q

Which parts of the semi-monocoque fuselage prevent tension from bending the fuselage?

A

Longerons and stringers

88
Q

Next on page 20

A

Airframe 15% Of Test... (1 decks)

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