ASA Sheetmetal

49- 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.

B- 2, 3, and 4.

64- What should be the included angle of a twist drill for soft metals?

B- 90°.

58- What type of bit should be used to drill holes in Plexiglas?

B- A specially modified twist drill.

85- Which part(s) of a semi-monocoque fuselage prevent(s) tension and compression from bending the fuselage?

B- Longerons and stringers.

79- Which statement is true regarding a cantilever wing?

B- No external bracing is needed.

92- Which of the following need not be considered when determining minimum rivet spacing?

B- Rivet length.

27- The classification for high tensile strength fiberglass used in aircraft structures is

B- S-glass.

57- What is the most common method of cementing transparent plastics?

B- Soak method.

88- (Refer to Figure 2.) Select the preferred drawing for proper countersinking.

C- 1

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

C- 1 inch in diameter.

66- 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

C- 13/16 inch.

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

C- 140° and turn at a low speed.

16- Which of these methods may be used to inspectfiberglass/honeycomb structures for entrapped water?1. Acoustic emission monitoring.2. X-ray.3. Backlighting.

C- 2 and 3.

35- Which fiber to resin (percent) ratio for advanced composite wet lay-ups is generally considered the best for strength?

C- 60:40.

60- Select the alternative which best describes the function of the flute section of a twist drill.

C- Forms the cutting edges of the drill point.

89- What is indicated by a black 'smoky' residue streaming back from some of the rivets on an aircraft?

C- Fretting corrosion is occurring between the rivets and the skin.

67- Which statement is true regarding the inspection of a stressed skin metal wing assembly known to have been critically loaded?

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

73- What is one of the determining factors which permits machine countersinking when flush riveting?

C- Thickness of the material is greater than the thickness of the rivet head.

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

C- Three times the diameter of the rivet shank.

59- What is the purpose of a gusset or gusset plate used in the construction and repair of aircraft structures?

C- To join and reinforce intersecting structural members.

93- What is the purpose of refrigerating 2017 and 2024 aluminum alloy rivets after heat treatment?

C- To retard age hardening.

33- What reference tool is used to determine how the fiber is to be oriented for a particular ply of fabric?

C- Warp clock (or compass).

40- When necessary, what type of cutting fluid is usually acceptable for machining composite laminates?

C- Water only.

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

C- an unairworthy repair.

55- If no scratches are visible after transparent plastic enclosure materials have been cleaned, their surfaces should be

C- covered with a thin coat of wax.

50- 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

C- crazing.

45- The preferred way to make permanent repairs on composites is by

C- laminating on new repair plies.

76- Repairs or splices involving stringers on the lower surface of stressed skin metal wings are usually

C- permitted but are normally more critical in reference to strength in tension than similar repairs to the upper surface.

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

C- scratches, kinks, tool marks, nicks, etc., must be held to a minimum.

9- The Dzus turnlock fastener consists of a stud, grommet, and receptacle. The stud diameter is measured in

C- sixteenths of an inch.

90- The identifying marks on the heads of aluminum alloy rivets indicate the

C- specific alloy used in the manufacture of the rivets.

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

C- the grain is perpendicular to the skin.

6- One of the main advantages of Hi-Lok type fasteners over earlier generations is that

C- they can be installed with ordinary hand tools.

4- The general rule for finding the proper rivet diameter is

C- three times the thickness of the thickest sheet.

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

TSO C22.

71- (Refer to Figure 1.) Which of the rivets shown will accurately fit the conical depression made by a 100° countersink?

A- 1

48- 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.

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

A- 118°.

98- The primary alloying agent of 2024-T3 is indicated by the number

A- 2

99- Which part of the 2017-T36 aluminum alloy designation indicates the primary alloying agent used in its manufacture?

A- 2

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

A- 2 and 3.

24- How many of the following are benefits of using microballoons when making repairs to laminated honeycomb panels?1. Greater concentrations of resin in edges and corners.2. Improved strength to weight ratio.3. Less density4. Lower stress concentrations

A- 2, 3, and 4.

61- 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

72- Which is 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.

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

A- Bleeder.

20- How does acoustic emission testing detect defects in composite materials?

A- By picking up the 'noise' of any deterioration that may be present.

30- The classification for fiberglass reinforcement material that has high resistivity and is the most common is

A- E-glass.

39- 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).

21- 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.

68- What is the minimum edge distance for aircraft rivets?

A- Two times the diameter of the rivet shank.

28- Which is an identifying characteristic of acrylic plastics?

A- Zinc chloride will have no effect.

7- The markings on the head of a Dzus fastener identify the

A- body diameter, type of head, and length of the fastener.

63- Shallow scratches in sheet metal may be repaired by

A- burnishing.

3- Alloy 2117 rivets are heat treated

A- by the manufacturer and do not require heat treatment before being driven.

86- Rivet gauge, or transverse pitch is the distance between the

A- centers of rivets in adjacent rows.

41- Fiberglass laminate damage not exceeding the first layer or ply can be repaired by

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

54- The coefficient of expansion of most plastic enclosure materials is

A- greater than both steel and aluminum.

14- 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.

8- The Dzus turnlock fastener consists of a stud, grommet, and receptacle. The stud length is measured in

A- hundredths of an inch.

94- Under certain conditions, type A rivets are not used because of their

A- low strength characteristics.

42- Fiberglass damage that extends completely through a laminated sandwich structure

A- may be repaired.

96- 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.

2- A main difference between Lockbolt/Huckbolt tension and shear fasteners (other than their application) is in the

A- number of locking collar grooves.

5- The shop head of a rivet should be

A- one and one-half times the diameter of the rivet shank.

91- When an MS20470D rivet is installed, its full shear strength is obtained

A- only after a period of age hardening.

12- Hole filling fasteners (for example, MS20470 rivets) should not be used in composite structures primarily because of the

A- possibility of causing delamination.

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

A- pot life.

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

A- repairable, using approved methods.

77- When straightening members made of 2024-T4, you should

A- straighten cold and reinforce.

22- 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.

74- 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.

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

A- thermoplastic.

37- Proper pre-preg composite lay-up curing is generally accomplished by1. applying external heat.2. room temperature exposure.3. adding a catalyst or curing agent to the resin.4. applying pressure.

B- 1 and 4.

100- 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

B- 1/4 inch.

97- The dimensions of an MS20430AD-4-8 rivet are

B- 1/8 inch in diameter and 1/2 inch long.

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

B- 100 times the thickness of the metal.

75- Which procedure is correct when using a reamer to finish a drilled hole to the correct size?

B- Turn the reamer only in the cutting direction.

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

B- Warp.

53- Which is considered good practice concerning the installation of acrylic plastics?

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

11- The installation of Cherrymax and Olympic-Lok rivets is accomplished by utilizing

B- a pulling tool.

78- Clad aluminum alloys are used in aircraft because they

B- are less subject to corrosion than uncoated aluminum alloys.

10- Threaded rivets (Rivnuts) are commonly used to

B- attach parts or components with screws to sheet metal.

56- Cabin upholstery materials installed in current standard category airplanes must

B- be at least flame resistant.

87- Rivet pitch is the distance between the

B- centers of adjacent rivets in the same row.

81- A factor which determines the minimum space between rivets is the

B- diameter of the rivets being used.

95- A rivet set used to drive MS20470 rivets should

B- have a slightly greater radius than the rivet head.

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

B- have mixed enough for a test sample.

62- Longitudinal (fore and aft) structural members of a semi-monocoque fuselage are called

B- longerons and stringers.

65- 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

B- lower speed with more pressure applied to the drill.

13- Metal fasteners used with carbon/graphite composite structures

B- must be constructed of material such as titanium or corrosion resistant steel.

29- Superficial scars, scratches, surface abrasion, or rain erosion on fiberglass laminates can generally be repaired by applying

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

15- (1) When performing a ring (coin tap) test on composite structures, 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.

B- only No. 1 is true.

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

B- requires the replacement of the damaged core and facing.

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

B- ribbon direction.

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

B- separation of the laminates.

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

B- shear loads.

84- The monocoque fuselage relies largely on the strength of

B- skin or covering.

34- The strength and stiffness of a properly constructed composite buildup depends primarily on

B- the orientation of the plies to the load direction.

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

B- tightened to a firm fit, then backed off one full turn.

38- 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

B- use short strips of fiberglass in the bonded repair.