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A/C Maintenance > Sheetmetal & Non-sheetmetalic Structure > Flashcards

Sheetmetal & Non-sheetmetalic Structure Flashcards

1
Q
  1. (1) When performing a ring (coin tap) test on composite structure, a change in sound may be due to damage or to transition to a different internal structure.
    (2) The extent of separation damage in composite structures is most accurately measured by a ring (coin tap) test
    Regarding the above statements,

a. Both No. 1 and No. 2 are true
b. Only No. 1 is true
c. Only No. 2 is true

A

b. Only No. 1 is true

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2
Q
  1. Clad aluminum alloys are used in aircraft because they

a. Can be heat treated much easier than the other forms of aluminum
b. Are less subject to corrosion than uncoated aluminum alloys
c. Are stronger than unclad aluminum alloys

A

b. Are less subject to corrosion than uncoated aluminum alloys

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3
Q
  1. A well-designed rivet joint will subject the rivets to

a. Compressive loads
b. Shear loads
c. Tension loads

A

b. Shear loads

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4
Q
  1. If a streamline cover plate is to be hand formed using a form block, a piece of dead soft aluminum should first be placed over the hollow portion of the mold and securely fastened in place. The bumping operation should be

a. Distributed evenly over the face of the aluminum at all times rather than being started at the edges or center.
b. Started by tapping the aluminum lightly around the edges and gradually working down into the center.
c. Started by tapping the aluminum in the center until it touches the bottom of the mold and then working out in all directions

A

b. Started by tapping the aluminum lightly around the edges and gradually working down into the center.

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5
Q
  1. If it is necessary to compute a bend allowance problem and bend allowance tables are not available, the neutral axis of the bend can be

a. Represented by the actual length of the required material for the bend
b. Found by adding approximately one-half of the thickness to the bend radius
c. Found by subtracting the stock thickness from the bend radius

A

b. Found by adding approximately one-half of the thickness to the bend radius

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6
Q
  1. The sight line on a sheet metal flat layout to be bent in a cornice or box brake is measured and marked

a. One-half radium from either bend tangent line
b. One radius from either bend tangent line
c. One radius from the bend tangent line that is placed under the brake

A

c. One radius from the bend tangent line that is placed under the brake

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7
Q
  1. On a sheet metal fitting layout with a single bend, allow for stretching by

a. Adding the setback to each leg
b. Subtracting the setback from one leg
c. Subtracting the setback from both legs

A

c. Subtracting the setback from both legs

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8
Q
  1. When necessary, what type of cutting fluid is usually acceptable for machining composite laminates?

a. Water soluble oil
b. Water displacing oil
c. Water only

A

c. Water only

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9
Q
  1. What is indicated by a black ‘smoky’ residue steaming back from some of the rivets on an aircraft?

a. The rivets were excessively work hardened during installation
b. Exfoliation corrosion is occurring inside the structure
c. Fretting corrosion is occurring between the rivets and the skin

A

c. Fretting corrosion is occurring between the rivets and the skin

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10
Q
  1. What type of bit should be used to drill holes in Plexiglas?

a. A standard twist drill
b. A specially modified twist drill
c. A dulled twist drill

A

b. A specially modified twist drill

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11
Q
  1. 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
b. Paint the outside area with several coats of exterior paint
c. None. Honeycomb is usually made from a man-made or fibrous material which is not susceptible to corrosion

A

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

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12
Q
  1. Mild steel rivets are used for riveting

a. Nickel-steel parts
b. Magnesium parts
c. Steel parts

A

c. Steel parts

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13
Q
  1. A main difference between Lockbolt/Huckbolt tension and shear fasteners (other than their application) is in the

a. Number of locking collar grooves
b. Shape of the head
c. Method of installation

A

a. Number locking collar grooves

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14
Q
  1. What is the minimum spacing for a single row of aircraft rivets?

a. Two times the diameter of the rivet shank
b. Three times the length of the rivet shank
c. Three times the diameter of the rivet shank

A

c. Three times the diameter of the rivet shank

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15
Q
  1. The coefficient of expansion of most plastic enclosure materials is

a. Greater than both steel and aluminum
b. Greater than steel but less than aluminum
c. Less than either steel or aluminum

A

a. Greater than both steel and aluminum

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16
Q
  1. What should be the included angle of a twist drill for soft metals?

a. 118 degrees
b. 90 degrees
c. 65 degrees

A

b. 90 degrees

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17
Q
  1. Which part of the 2017-T36 aluminum alloy designation indicates the primary alloying agent used in its manufacture?

a. 2
b. 17
c. 20

A

a. 2

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18
Q
  1. Rivet gauge, or transverse pitch is the distance between the

a. Centers of rivets in adjacent rows
b. Centers of adjacent rivets in the same row
c. Heads of rivets in the same row

A

a. Centers of rivets in adjacent rows

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19
Q
  1. Which statement is true regarding a cantilever wing?

a. It has nonadjustable lift struts
b. No external bracing is needed
c. It requires only one lift strut on each side

A

b. No external bracing is needed

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20
Q
  1. Fiberglass damage that extends completely through a laminated sandwich structure

a. May be repaired
b. Must be filled with resin to eliminate dangerous stress concentrations
c. May be filled with putty which is compatible with resin

A

a. May be repaired

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21
Q
  1. Threaded rivets (Rivnuts) are commonly used to

a. Join two or more pieces of sheet metal where shear strength is desired
b. Attach parts or components with screws to sheet metal
c. Join two or more pieces of sheet metal where bearing strength is desired

A

b. Attach prats or components with screws to sheet metal

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22
Q
  1. What should be the included angle of a twist drill for hard metal?

a. 118 degrees
b. 100 degrees
c. 90 degrees

A

a. 118 degrees

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23
Q
  1. When repairing a small hole on a metal stressed skin, the major consideration in the design of the patch should be

a. The shear strength of the riveted joint
b. To use rivet spacing similar to a seam in the skin
c. That the bond between the patch and the skin is sufficient to prevent dissimilar metal corrosion

A

a. The shear strength of the riveted joint

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24
Q
  1. A factor which determines the minimum space between rivets is the

a. Length of the rivets being used
b. Diameter of the rivets being used
c. Thickness of the material being used

A

b. Diameter of the rivets being used

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25
Q
  1. What is the material layer used within the vacuum bag pressure system to absorb excess resin during curing called?

a. Bleeder
b. Breather
c. Release

A

a. Bleeder

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26
Q
  1. If a new safety belt is to be installed in an aircraft, the belt must conform the strength requirements in which documents?

a. STC 1282
b. 14 CFR Part 39
c. TSO C22

A

c. TSO C22

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27
Q
  1. What is one of the determining factors which permit machine countersinking when flush riveting?

a. Thickness of the material and rivet diameter are the same
b. Thickness of the material is less than the thickness of the rivet head
c. Thickness of the material is greater than the thickness of the rivet head

A

c. Thickness of the material is greater than the thickness of the rivet head

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28
Q
  1. When balsa wood is used to replace a damaged honeycomb core, the plug should be cut so that

a. The grain is parallel to the skin
b. It is about 1/8 inch undersize to allow sufficient bonding material to be applied
c. The grain is perpendicular to the skin

A

c. The grain is perpendicular to the skin

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29
Q
  1. Under certain conditions, type a rivets are not used because of their

a. Low strength characteristics
b. High alloy content
c. Tendency toward embrittlement when subjected to vibration

A

a. Low strength characteristics

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30
Q
  1. Which rivet may be used as received without further treatment?

a. 2024-T4
b. 2117-T3
c. 2017-T3

A

b. 2117-T3

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31
Q
  1. Cabin upholstery materials installed in current standard category airplanes must

a. Be fireproof
b. Be at least flame resistant
c. Meet the requirements prescribed in Part 43

A

b. Be at least flame resistant

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32
Q
  1. A rivet set used to drive MS20470 rivets should

a. Have the same radius as the rivet head
b. Have a slightly greater radius than the rivet head
c. Be nearly flat on the end, with a slight radius on the edge to prevent damage to the sheet being riveted

A

b. Have a slightly greater radius than the rivet head

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33
Q
  1. The general rule for finding the proper rivet diameter is

a. Three times the thickness of the materials to be joined
b. Two times the rivet length
c. Three times the thickness of the thickest sheet

A

c. Three times the thickness of the thickest sheet

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34
Q
  1. MS20426AD-6-5 indicates a countersunk rivet which has

a. A shank length of 5/16 inch (excluding head)
b. A shank length 5/32 inch (excluding head)
c. An overall length of 5/16 inch

A

c. An overall length of 5/16 inch

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35
Q
  1. Superficial scars, scratches, surface abrasion, or rain erosion on fiberglass laminates can generally be repaired by applying

a. A piece of resin-impregnated glass fabric facing
b. One or more coats of suitable resin (room-temperature catalyzed) to the surface
c. A sheet of polyethylene over the abraded surface and one or more coats of resin cured with infrared heat lamps

A

b. One or more coats of suitable resin (room-temperature catalyzed) to the surface

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36
Q
  1. Fiberglass laminate damage that extends completely through one facing and into the core

a. Cannot be repaired
b. Requires the replacement of the damaged core and facing
c. Can be repaired by using a typical metal facing patch

A

b. Requires the replacement of the damaged core and facing

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37
Q
  1. When straightening members made of 2024-T4, you should

a. Straighten cold and reinforce
b. Straighten cold and anneal to remove stress
c. Apply heat to the inside of the bend

A

a. Straighten cold and reinforce

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38
Q
  1. The classification for high tensile strength fiberglass used in aircraft structure is

a. E-glass
b. S-glass
c. G-glass

A

b. S-glass

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39
Q
  1. Repairs o splices involving stringers on the lower surface of stressed skin metal wings are usually

a. Not permitted
b. Permitted only if the damage does not exceed 6 inches in any direction
c. Permitted but are normally more critical in reference to strength in tension than similar repairs to the upper surface

A

c. Permitted but are normally more critical in reference to strength in tension than similar repairs to the upper surface

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40
Q
  1. Which is correct concerning the use of a file?

a. Apple pressure on the forward stroke, only, except when filing very soft metals such as lead or aluminum
b. A smoother finish can bee obtained by suing a double-cut file than by using a single-cut file
c. The terms ‘double-cut’ and ‘second-cut’ have the same meaning in reference to files

A

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

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41
Q
  1. The Dzus turnlock fastener consists of a stud, grommet, and receptacle. The stud diameter is measured in

a. Tenths of an inch
b. Hundredths of an inch
c. Sixteenths of an inch

A

c. Sixteenths of an inch

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42
Q
  1. Heat-treated rivets in the D and DD series that are not driven within the prescribed time after heat treatment or removal from refrigeration

a. Must be reheat treated before use
b. Must be discarded
c. May be returned to refrigeration and used later without reheat treatment

A

a. Must be reheat treated before use

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43
Q
  1. Parts fabricated from Alclad 2024-T3 aluminum sheet stock must have all

a. Bends made with a small radius to develop maximum strength
b. Bends 90 degrees to the grain
c. Scratches, kinks, tool marks, nicks, etc., must be held to a minimum

A

c. Scratches, kinks, tool marks, nicks, etc., must be held to a minimum

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44
Q
  1. Metal fasteners used with carbon/graphite composite structures

a. May be constructed of any of the metals commonly used in aircraft fasteners
b. Must be constructed of material such as titanium or corrosion resistant steel
c. Must be constructed of high strength aluminum-lithium alloy

A

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

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45
Q
  1. The part of a replacement honeycomb core that must line up with the adjacent original is the

a. Cell side
b. Ribbon direction
c. Cell edge

A

b. Ribbon direction

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46
Q
  1. Longitudinal (fore and aft) structural members of a semi-monocoque fuselage are called

a. Spars and ribs
b. Longerons and stringers
c. Spars and stringers

A

b. Longerons and stringers

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47
Q
  1. When drilling stainless steel, the drill used should have an included angle of

a. 90 degrees and turn at a low speed
b. 118 degrees and turn at a high speed
c. 140 degrees and turn at a low speed

A

c. 140 degrees and turn at a low speed

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48
Q
  1. What is the minimum edge distance for aircraft rivets?

a. Two times the diameter of the rivet shank
b. Two times the diameter of the rivet head
c. Three times the diameter of the rivet shank

A

a. Two times the diameter of the rivet shank

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49
Q
  1. The identifying marks on the heads of aluminum alloy rivets indicate the

a. Degree of dimensional and process control observed during manufacture
b. Head shape, shank size, material used, and specifications adhered to during manufacture
c. Specific alloy used in the manufacture of the rivets

A

c. Specific alloy used in the manufacture of the rivets

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50
Q
  1. A piece of sheet metal is bent to a certain radius. The curvature of the bend is referred to as the

a. Bend allowance
b. Neutral line
c. Bend radius

A

c. Bend radius

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51
Q
  1. The installation of Cherrymax and Olympic-lok rivets is accomplished by utilizing

a. Rivet gun, special rivet set, and bucking bar
b. A pulling tool
c. Ordinary hand tools

A

b. A pulling tool

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52
Q
  1. Which is an identifying characteristic of acrylic plastics?

a. Zinc chloride will have no effect
b. Acrylic has a yellowish tint when viewed from the edge
c. Acetone will soften plastic, but will change its color

A

a. Zinc chloride will have no effect

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53
Q
  1. The sharpest bend that can be placed in a piece of metal without critically weakening the part is called the

a. Bend allowance
b. Minimum radius of bend
c. Maximum radius of bend

A

b. Minimum radius of bend

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54
Q
  1. What is the most common method of cementing transparent plastics?

a. Heat method
b. Soak method
c. Bevel method

A

b. Soak method

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55
Q
  1. Which rivet is used for riveting nickel-steel alloys?

a. 2024-aluminum
b. Mild steel
c. Monel

A

c. Monel

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56
Q
  1. If an aircraft’s transparent plastic enclosures exhibit fine cracks which may extend in a network over or under the surface or through the plastic, the plastic is said to be

a. Hazing
b. Brinelling
c. Crazing

A

c. Crazing

57
Q
  1. Which of the following drill bit types work best when drilling an aramid fiber (Kevlar) composite laminate?

a. Tool steel with standard grind
b. Diamond dust coated
c. Carbide W-point

A

c. Carbide W-point

58
Q
  1. The purpose of a joggle is to

a. Allow clearance for a sheet or an extrusion
b. Increase obstruction for a sheet or an extrusion
c. Decrease the weight of the part and still retain the necessary strength

A

a. Allow clearance for a sheet or an extrusion

59
Q
  1. What is the purpose of refrigerating 2017 and 2024 aluminum alloy rivets after heat treatment?

a. To accelerate age hardening
b. To relieve internal stresses
c. To retard age hardening

A

c. To retard age hardening

60
Q
  1. Which fiber to resin (percent) ration for advanced composite wet lay-ups is generally considered the best for strength?

a. 40:60
b. 50:50
c. 60:40

A

c. 60:40

61
Q
  1. Sandwich panels made of metal honeycomb construction are used on modern aircraft because this type of construction

a. Has a high strength to weight ratio
b. May be repaired by gluing replacement skin to the inner core material with thermoplastic resin
c. Is lighter than single sheet skin of the same strength and is more corrosion resistant

A

a. Has a high strength to weight ratio

62
Q
  1. Which statement is true regarding the inspection of a stressed skin metal wing assembly known to have been critically loaded?

a. If rivets show no visible distortion, further investigation is unnecessary
b. If bearing failure has occurred, the rivet shanks will be joggled
c. If genuine rivet tipping has occurred, groups of consecutive rivet heads will be tipped in the same direction

A

c. If genuine rivet tipping has occurred, groups of consecutive rivet heads will be tipped in the same direction

63
Q
  1. The Dzus turnlock fastener consists of a stud, grommet, and receptacle. The stud length is measured in

a. Hundredths of an inch
b. Tenths of an inch
c. Sixteenth of an inch

A

a. Hundredths of an inch

64
Q
  1. A piece of flat stock that is to be bent to a closed angle of 15 degrees must be bent through an angle of

a. 165 degrees
b. 105 degrees
c. 90 degrees

A

a. 165 degrees

65
Q
  1. What is the purpose of a gusset or gusset plate used in the construction and repair of aircraft structures?

a. To hold structural members in position temporarily until the permanent attachment has been completed
b. To provide access for inspection of structural attachments
c. To join and reinforce intersecting structural members

A

c. To join and reinforce intersecting structural members

66
Q
  1. A sheet metal repair is to be made using two pieces of 0.0625-inch aluminum riveted together. All rivet holes are drilled for 1/8-inch rivets. The length of the rivets to be used will be

a. 5/32 inch
b. 3/16 inch
c. 5/16 inch

A

c. 5/16 inch

67
Q
  1. When making repairs to fiberglass, cleaning of the area to be repaired is essential for a good bond. The final cleaning should be made using

a. MEK (methyl ethyl ketone)
b. Soap, water, and a scrub brush
c. A thixotropic agent

A

a. MEK (methyl ethyl ketone)

68
Q
  1. What type loads cause the most rivet failures?

a. Shear
b. Bearing
c. Head

A

a. Shear

69
Q
  1. Aircraft structural units, such as spars, engine supports, etc., which have been built up from sheet metal, are normally

a. Repairable, using approved methods
b. Repairable, except when subjected to compressive loads
c. Not repairable, but must be replace when damaged or deteriorated

A

a. Repairable, using approved methods

70
Q
  1. Hole filling fasteners (for example, MS20470 rivets) should not be used in composite structures primarily because of the

a. Possibility of causing delamination
b. Increased possibility of fretting corrosion in the fastener
c. Difficulty in forming a proper shop head

A

a. Possibility of causing delamination

71
Q
  1. When comparing the machining techniques for stainless steel sheet material to those for aluminum alloy sheet, it is normally considered good practice to drill the stainless steel at a

a. Higher speed with less pressure applied to the drill
b. Lower speed with more pressure applied to the drill
c. Lower speed with less pressure applied to the drill

A

b. Lower speed with more pressure applied to the drill

72
Q
  1. How does acoustic emission testing detect defects in composite materials?

a. By picking up the ‘noise’ of any deterioration that may be present
b. By analyzing ultrasonic signals transmitted into the parts being inspected
c. By creating sonogram pictures of the areas being inspected

A

a. By picking up the ‘noise’ of any deterioration that may be present

73
Q
  1. One of the best ways to assure that a properly prepared batch of matrix resin has been achieved is to

a. Perform a chemical composition analysis
b. Have mixed enough for a test sample
c. Test the viscosity of the resin immediately after mixing

A

b. Have mixed enough for a test sample

74
Q
  1. If no scratches are visible after transparent plastic enclosure materials have been cleaned, their surfaces should be

a. Polished with rubbing compound applied with a damp cloth
b. Buffed with a clean, soft, dry cloth
c. Covered with a thin coat of wax

A

c. Covered with a thin coat of wax

75
Q
  1. The length of time that a catalyzed resin will remain in a workable state is called the

a. Pot life
b. Shelf life
c. Service life

A

a. Pot life

76
Q
  1. Which is considered good practice concerning the installation of acrylic plastics?

a. When nuts and bolts are used, the plastic should be installed hot and tightened to a firm fit before the plastic cools
b. When rivets are used, adequate spacer or other satisfactory means to prevent excessive tightening of the frame to the plastic should be provided
c. When rivets or nuts and bolts are used, slotted holes are not recommended

A

b. When rivets are used, adequate spacer or other satisfactory means to prevent excessive tightening of the frame to the plastic should be provided

77
Q
  1. The primary alloying agent of 2024-T3 is indicated by the number

a. 2
b. 20
c. 24

A

a. 2

78
Q
  1. How many of the following are benefits of using microballoons when making repairs to laminated honeycomb panels?
  2. Greater concentrations of resin in edges and corners
  3. Improved strength to weight ratio
  4. Less density
  5. Lower stress concentrations

a. 2, 3, and 4
b. 1, 2, and 4
c. All of the above

A

a. 2, 3, and 4

79
Q
  1. Alloy 2117 rivets are heat treated

a. By the manufacturer and do not require heat treatment before being driven
b. By the manufacturer but require reheat treatment before being driven
c. To a temperature of 910 to 930 degrees Fahrenheit and quenched in cold water

A

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

80
Q
  1. One look of the main advantages of Hi-Lok type fasteners over earlier generations is that

a. They can be removed and reused again
b. The squeezed can be installed with ordinary hand tools
c. They can be installed with ordinary hand tools

A

c. They can be installed with ordinary hand tools

81
Q
  1. The most important Factors needed to make a flat pattern layout are

a. Radius, thickness, and mold line
b. Radius, thickness, and degree of bend
c. The lengths of the legs (flat sections)

A

b. Radius, thickness, and degree of bend

82
Q
  1. A potted compound repair on honeycomb can usually be made on damages less than

a. 4 inches in diameter
b. 2 inches in diameter
c. 1 inch in diameter

A

c. 1 inch in diameter

83
Q
  1. Shallow scratches in sheet metal may be repaired by

a. Burnishing
b. Buffling
c. Stop drilling

A

a. Burnishing

84
Q
  1. The monocoque fuselage relies largely on the strength of

a. Longerons and formers
b. Skin or covering
c. Bulkheads and longerons

A

b. Skin or covering

85
Q
  1. You can distinguish between aluminum and aluminum alloy by

a. Filing the metal
b. Testing with an acetic solution
c. Testing with a 10 percent solution of caustic soda

A

c. Testing with a 10 percent solution of caustic soda

86
Q
  1. When bending metal, the material on the outside of the curve stretches while the material on the inside of the curve compresses. That part of the material which is not affected by either stress is the

a. Mold line
b. Bend tangent line
c. Neutral line

A

c. Neutral line

87
Q
  1. How many MS20470 AD-4-6 rivets will be required to attach a 10 x 5 inch plate, using a single row of rivets, minimum edge distance and 4D spacing?

a. 56
b. 54
c. 52

A

a. 56

88
Q
  1. When installing transparent plastic enclosures which are retained by bolts extending through plastic material and self-locking nuts, the nuts should be

a. Tightened to a firm fit, plus one full turn
b. Tightened to a firm fit, then backed off one full turn
c. Tightened to a firm

A

b. Tightened to a firm fit, then backed off one full turn

89
Q
  1. When repairing puncture-type damage of a metal faced laminated honeycomb panel, the edges of the doubler should be tapered to

a. Two times the thickness of the metal
b. 100 times the thickness of the metal
c. Whatever is desired for a neat, clean appearance

A

b. 100 times the thickness of the metal

90
Q
  1. Fiberglass laminate damage out exceeding the first layer or play can be repaired by

a. filling with a putty consisting of a compatible resin and clean, short glass fibers
b. Sanding the damaged area until aerodynamic smoothness is obtained
c. Trimming the rough edges and sealing with paint

A

a. filling with a putty consisting of a compatible resin and clean, short glass fibers

91
Q
  1. Most rivets used in aircraft construction have

a. Dimples
b. Smooth heads without markings
c. A raised dot

A

a. Dimples

92
Q
  1. Composite fabric material is considered to be the strongest in what direction?

a. Fill
b. Warp
c. Bias

A

b. Warp

93
Q
  1. The markings on the head of a Dzus fastener identify the

a. Body diameter, type of head, and length of the fastener
b. Body type, head diameter, and type of material
c. Manufacturer and type of material

A

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

94
Q
  1. The strength and stiffness of a properly constructed composite buildup depends primarily on

a. A 60 percent matrix to 40 percent fiber ratio
b. The orientation of the plies to the load direction
c. The ability of the fibers to transfer stress to the matrix

A

b. The orientation of the plies to the load direction

95
Q
  1. When riveting dissimilar metals together, what precautions must be taken to prevent an electrolytic action?

a. Treat the surfaces to be riveted together with a process called anodic treatment
b. Place a protective separator between the areas of potential electrical difference
c. Avoid the use of dissimilar metals by redesigning the unit according to the recommendations outlines in AC 43.13-1A

A

b. Place a protective separator between areas of potential electrical difference

96
Q
  1. A DD rivet is heat treated before use to

a. Harden and increase strength
b. Relieve internal stresses
c. Soften to facilitate riveting

A

c. Soften to facilitate riveting

97
Q
  1. When a piece of aluminum alloy is to be bent using minimum radius for the type and thickness of material

a. The piece should be bent slowly to eliminate cracking
b. The layout should be made so that the bend will be 90 degrees to the grain of the sheet
c. Less pressure than usual should be applied with the movable (upper) clamping bar

A

b. The layout should be made so that the bend will be 90 degrees to the grain of the sheet

98
Q
  1. Which of the following are generally characteristic of carbon/graphite fiber composites?
    a. Flexibility
    b. Stiffness
  2. High compressive strength
  3. Corrosive effect in contact with aluminum
  4. Ability to conduct electricity

a. 1 and 3
b. 2, 3 and 4
c. 1, 3 and 5

A

b. 2, 3 and 4

99
Q
  1. The classification for fiberglass reinforcement material that has high resistivity and is the most common is

a. E-glass
b. S-glass
c. G-glass

A

a. E-glass

100
Q
  1. When repairing large, flat surfaces with polyester resins, warping of the surface is likely to occur. One method of reducing the amount of warpage is to

a. Add an extra amount of catalyst to the resin
b. Use short strips of fiberglass in the bonded repair
c. Use less catalyst than normal so the repair will be more flexible

A

b. Use short strips of fiberglass in the bonded repair

101
Q
  1. Joggles in removed rivet shanks would indicate partial

a. Bearing failure
b. Torsion failure
c. Shear failure

A

c. Shear failure

102
Q
  1. The dimensions of an MS20430AD-4-8 rivet are

a. 1/8 inch in diameter and 1/4 inch long
b. 1/8 inch in diameter and 1/2 inch long
c. 4/16 inch in diameter and 8/32 inch long

A

b. 1/8 inch in diameter and 1/2 inch long

103
Q
  1. When inspecting a composite panel using the ring test/tapping method, a dull thud may indicate

a. Less than full strength curing of the matrix
b. Separation of the laminates
c. An area of too much matrix between fiber layers

A

b. Separation of the laminates

104
Q
  1. Which of the following, when added to wet resins, provide strength for the repair of damaged fastener holes in composite panels?
  2. Microballoons
  3. Flox
  4. Chapped fibers

a. 2 and 3
b. 1 and 3
c. 1, 2, and 3

A

a. 2 and 3

105
Q
  1. Which procedure is correct when using a reamer to finish a drilled hole to the correct size?

a. Turn the reamer in the cutting direction when enlarging the hole and in the opposite direction to remove from the hole
b. Turn the reamer only in the cutting direction
c. Apply considerable pressure on the reamer when starting the cut and reduce the pressure when finishing the cut

A

b. Turn the reamer only in the cutting direction

106
Q
  1. Which part (s) of a semi-monocoque fuselage prevent (s) tension and compression from bending the fuselage?

a. The fuselage covering
b. Longerons and stringers
c. Bulkhead and skin

A

b. Longerons and stringers

107
Q
  1. What is generally the best procedure to use when removing a solid shank rivet?

a. Drill through the manufactured head and shank with a shank size drill and remove the river with a punch
b. Drill to the base of the manufactured rivet head with a drill one size smaller than the rivet shank and remove the rivet with a punch
c. Drill through the manufactured head and shank with a drill one size smaller than the rivet and remove the rivet with a punch

A

b. Drill to the base of the manufactured rivet head with a drill one size smaller than the rivet shank and remove the rivet with a punch

108
Q
  1. 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 I diameter?

a. The minimum edge distance for the single row is greater than that for the multiple row
b. The minimum edge distance for the single row is less than that for the multiple row
c. The minimum edge distance for the single row is equal to that for the multiple row

A

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

109
Q
  1. When an MS20470D rivet is installed, its full shear strength is obtained

a. Only after a period of age hardening
b. By the cold working of the rivet metal in forming a shop head
c. By heat treating just prior to being driven

A

a. Only after a period of age hardening

110
Q
  1. A single-lap sheet splice is to be used to repair a section of damaged aluminum skin. If a double row of 1/8-inch rivets is used, the minimum allowable overlap will be

a. 1/2 inch
b. 3/4 inch
c. 13/16 inch

A

c.

111
Q
  1. The length of rivet to be chosen when making a structural repair that involves the joining of 0.032-inch and 0.064-inch aluminum sheet, drilled with a No. 30 drill, is

a. 7/16 inch
b. 5/16 inch
c. 1/4 inch

A

b.

112
Q
  1. A sheet metal repair is to be made using two pieces of 0.040-inch aluminum riveted together. All rivet holes are drilled for 3/32-inch rivets. The length of the rivets to be used will be

a. 1/8 inch
b. 1/4 inch
c. 5/16 inch

A

b.

113
Q
  1. Unless otherwise specified, the radius of a bend is the

a. Inside radius of the metal being formed
b. Inside radius plus one-half the thickness of the metal being formed
c. Radius of the metal axis plus one-half the thickness of the metal being formed

A

a.

114
Q
  1. Which of the following need not be considered when determining minimum rivet spacing?

a. Rivet diameter
b. Rivet length
c. Type of material being riveted

A

b.

115
Q
  1. The preferred way to make permanent repairs on composites is by

a. Bonding on metal or cured composite patches
b. Riveting on metal or cured composite patches
c. Laminating on new repair plies

A

c.

116
Q
  1. Which of these methods may be used to inspect fiberglass/honeycomb structures for entrapped water?
    (1) Acoustic emission monitoring
    (2) X-ray
    (3) Backlighting

a. 1 and 2
b. 1 and 3
c. 2 and 3

A

c.

117
Q
  1. Which rivets should be selected to join two sheets of .032-inch aluminum?

a. MS20425D-4-3
b. MS20470AD-4-4
c. MS20455DD-5-3

A

b.

118
Q
  1. Select the alternative which best describes the function of the flute section of a twist drill

a. Provides a method for cooling oil to be delivered to the cutting surface
b. Forms the area where the drill bit attaches to the drill motor
c. Forms the cutting edges of the drill point

A

c.

119
Q
  1. Which of the following are generally characteristic of aramid fiber (Kevlar) composites?
    (1) High tensile strength
    (2) Flexibility
    (3) Stiffness
    (4) Corrosive effect in contact with aluminum
    (5) Ability to conduct electricity

a. 1 and 2
b. 2, 3 and 4
c. 1, 3 and 5

A

a.

120
Q
  1. 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
b. Use dye-penetrant inspection procedures, exposing the entire damaged area to the penetrant solution.
c. Use an eddy current probe on both sides of the damaged area

A

a.

121
Q
  1. The length of a rivet to be used to join a sheet of .032-inch and .064-inch aluminum alloy should be equal to

a. Two times the rivet diameter plus .064 inch
b. One and one-half times the rivet diameter plus .096 inch
c. Three times the rivet diameter plus .096 inch

A

b.

122
Q
  1. Rivet pitch is the distance between the

a. Centers of rivets in adjacent rows
b. Centers of adjacent rivets in the same row
c. Heads of rivets in the same row

A

b.

123
Q
  1. A category of plastic material that is capable of softening or flowing when reheated is described as a

a. Thermoplastic
b. Thermocure
c. Thermoset

A

a.

124
Q
  1. Which rivet is used for riveting magnesium alloy structures?

a. Mild steel
b. 5056 aluminum
c. Monel

A

b.

125
Q
  1. Proper pre-preg composite lay-up curing is generally accomplished by
    (1) Applying external heat
    (2) Room temperature exposure
    (3) Adding a catalyst or curing agent to the resin
    (4) Applying pressure

a. 2 and 3
b. 1 and 4
c. 1, 2, and 4

A

b.

126
Q
  1. The flat layout or blank length of a piece of metal from which a simple L-shaped bracket 3 inches by 1 inch is to be bent depends upon the radius of the desired bend. The bracket which will require the greatest amount of material is one which has a bend radius of

a. 1/8 inch
b. 1/2 inch
c. 1/4 inch

A

a.

127
Q
  1. What reference tool is used to determine how the fiber is to be oriented for a particular ply of fabric?

a. Fill clock (or compass)
b. Bias clock (or compass)
c. Warp clock (or compass)

A

c.

128
Q
  1. Repairing advanced composites using materials and techniques traditionally used for fiberglass repairs is likely to result in

a. Restored strength and flexibility
b. Improved wear resistance to the structure
c. An unairworthy repair

A

c.

129
Q
  1. The aluminum alloys used in aircraft construction are usually hardened by which method?

a. Cold-working
b. Aging
c. Heat treatment

A

c.

130
Q
  1. The shop head of a rivet should be

a. One and one-half times the diameter of the rivet shank
b. One-half times the diameter of the rivet shank
c. One and one-half times the diameter of the manufactured head of the rivet

A

a.

130
Q
  1. The shop head of a rivet should be

a. One and one-half times the diameter of the rivet shank
b. One-half times the diameter of the rivet shank
c. One and one-half times the diameter of the manufactured head of the rivet

A

a.

131
Q
  1. One of the main advantages of Hi-Lok type fasteners over earlier generations is that

a. they can be removed and reused again
b. the squeezed on collar installation provides a more secure, tighter fit
c. they can be installed with ordinary hand tools

A

c.

132
Q
  1. Cherrymax and Olympic-Lok rivets

a. utilize a rivet gun, special rivet set, and bucking bar for installation
b. utilize a pulling tool for installation
c. may be installed with ordinary hand tools

A

b

133
Q
  1. Composite inspections conducted by means of acoustic emission monitoring

a. pick up the ‘noise’ of corrosion or other deterioration occurring
b. analyze ultrasonic signals transmitted into the parts being inspected
c. create sonogram pictures of the areas being inspected

A

a.

134
Q
  1. The classification for fiberglass reinforcement material that has high resistivity and is the most common is

a. E
b. S
c. G

A

a.

135
Q
  1. Which of the following are generally characteristic of carbon/graphite fiber composites?
    (1) Flexibility.
    (2) Stiffness.
    (3) High compressive strength.
    (4) Corrosive effect in contact with aluminum.
    (5) Ability to conduct electricity.

a. 1 and 3
b. 2, 3, and 4
c. 1, 3, and 5

A

b.

136
Q
  1. When holes are drilled completely through Plexiglas, a

a. standard twist drill should be used
b. specially modified twist drill should be used
c. wood drill should be used

A

b.

137
Q
  1. When fabricating parts from Alclad 2024-T3 aluminum sheet stock,

a. bends should be made with a small radius to develop maximum strength
b. all bends must be 90 degrees to the grain
c. all scratches, kinks, tool marks, nicks, etc., must be held to a minimum

A

c.

138
Q
A

A/C Maintenance (17 decks)

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