Airframe Part 2

Card Set Information

Airframe Part 2
2011-09-05 19:33:41

Sheet Metal and Non-Metallic Structures
Show Answers:

  1. A well-designed rivet joint will subject the rivets to
    Shear Loads
  2. A main difference between Lockbolt/Huckbolt tension and shear fasteners (other than their application) is in the
    Number of locking collar grooves
  3. Alloy 2117 rivets are heat treated
    by the manufacturer and do not require heat treatment before being driven.
  4. The general rule for finding the proper rivet diameter is
    Three time the thickness of the thickest sheet.
  5. The shop head of a rivet should be
    one and one-half times the diameter of the rivet shank.
  6. One of the main advantages of Hi-Lok type fasteners over earlier generations is that
    they can be installed with ordinary hand tools.
  7. The markings on the head of a Dzus fastener identify the
    Body Diameter, type of head, and length of the fastener.
  8. The Dzus turnlock fastener consists of a stud, grommet, and receptacle. The stud length is measured in
    hundrenths of an Inch.
  9. The Dzus turnlock fastener consists of a stud, grommet, and receptacle. The stud diameter is measured in
    Sixteenths of an Inch
  10. Threaded rivets (Rivnuts) are commonly used to
    attach parts or components with screws to sheet metal.
  11. Cherrymax and Olympic-Lok rivets
    Utilize a pulling tool for installation.
  12. Hole filling fasteners (for example, MS20470 rivets) should not be used in composite structures primarily because of the
    Posibility of causing delamination.
  13. Metal fasteners used with carbon/graphite composite structures
    must be constructed of material such as titanium or corrosion resistant steel.
  14. Sandwich panels made of metal honeycomb construction are used on modern aircraft because this type of construction
    Has a higher strength to weight ratio.
  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.
    Only No. 1 is True
  16. Which of these methods may be used to inspect fiberglass/honeycomb structures for entrapped water?
    2. X-ray.
    3. Backlighting.
    2 and 3
  17. When balsa wood is used to replace a damaged honeycomb core, the plug should be cut so that
    the grain is perpendicular to the skin.
  18. When repairing puncture-type damage of a metal faced laminated honeycomb panel, the edges of the doubler should be tapered to
    100 Times the thickness of the material.
  19. One of the best ways to assure that a properly prepared batch of matrix resin has been achieved is to
    have mixed enough for a test sample.
  20. Composite inspections conducted by means of acoustic emission monitoring
    pick up the noise of 'Noise' of corossion or other deterioration occuring.
  21. What precaution, if any, should be taken to prevent corrosion inside a repaired metal honeycomb structure?
    Prime the repair with a corrosion inhibitor and seal from the atmosphere.
  22. One method of inspecting a laminated fiberglass structure that has been subjected to damage is to
    Strip the damage area of all paint and shine a strong light through the structure.
  23. When inspecting a composite panel using the ring test/tapping method, a dull thud may indicate
    seperation of laminates
  24. How many of the following are benefits of using microballoons when making repairs to laminated honeycomb panels?

    2. Improved strength to weight ratio.
    3. Less density
    4. Lower stress concentrations
    2, 3, and 4
  25. The length of time that a catalyzed resin will remain in a workable state is called the
    Pot Life
  26. A category of plastic material that is capable of softening or flowing when reheated is described as a
  27. The classification for high tensile strength fiberglass used in aircraft structures is
  28. Which is an identifying characteristic of acrylic plastics?
    Zinc Chloride will have no effect
  29. Superficial scars, scratches, surface abrasion, or rain erosion on fiberglass laminates can generally be repaired by applying
    One or more coats of suitable resin ( Room-Temperature Catalyzed) to the surface.
  30. The classification for fiberglass reinforcement material that has high resistivity and is the most common is
  31. A potted compound repair on honeycomb can usually be made on damages less than
    1 inch in diameter
  32. Composite fabric material is considered to be the strongest in what direction?
  33. What reference tool is used to determine how the fiber is to be oriented for a particular ply of fabric?
    Warp Clock (or Compass)
  34. The strength and stiffness of a properly constructed composite buildup depends primarily on
    the orientation of the plies to the load direction
  35. Which fiber to resin (percent) ratio for advanced composite wet lay-ups is generally considered the best for strength?
  36. What is the material layer used within the vacuum bag pressure system to absorb excess resin during curing called?
  37. Proper pre-preg composite lay-up curing is generally accomplished by
    1. applying external heat.
    4. applying pressure.
    1 and 4
  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
    Use short strips of Fiberglass in the bonded repair.
  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
    MEK ( Methyl Ethyl Ketone)
  40. When necessary, what type of cutting fluid is usually acceptable for machining composite laminates?
    Water Only
  41. Fiberglass laminate damage not exceeding the first layer or ply can be repaired by
    Filling with a putty consisting of a compatible resin and clean, short glass fibers.
  42. Fiberglass damage that extends completely through a laminated sandwich structure
    May be Repaired.
  43. Fiberglass laminate damage that extends completely through one facing and into the core
    Requires the replacement of the damaged core and facing.
  44. Repairing advanced composites using materials and techniques traditionally used for fiberglass repairs is likely to result in
    An unairworthy repair.
  45. The preferred way to make permanent repairs on composites is by
    lamintating on new repair plies
  46. Which of the following, when added to wet resins, provide strength for the repair of damaged fastener holes in composite panels?

    2. Flox.
    3. Chopped fibers.
    2 and 3
  47. The part of a replacement honeycomb core that must line up with the adjacent original is the
    ribbon direction
  48. Which of the following are generally characteristic of aramid fiber (Kevlar) composites?
    1. High tensile strength.
    2. Flexibility.
    1 and 2
  49. Which of the following are generally characteristic of carbon/graphite fiber composites?
    2. Stiffness.
    3. High compressive strength.
    4. Corrosive effect in contact with aluminum.
    2, 3, and 4
  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
  51. When installing transparent plastic enclosures which are retained by bolts extending through the plastic material and self-locking nuts, the nuts should be
    tighten to a firm fit, and backed off one full turn.
  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
  53. Which is considered good practice concerning the installation of acrylic plastics?
    When rivets are used, adequate spacer or satisfactory means to prevent excessive tightening of the frame to the plastic should be provided.
  54. The coefficient of expansion of most plastic enclosure materials is
    greater than both steel and aluminum
  55. If no scratches are visible after transparent plastic enclosure materials have been cleaned, their surfaces should be
    covered with a thin coat of wax.
  56. Cabin upholstery materials installed in current standard category airplanes must
    be at least flame resistant
  57. What is the most common method of cementing transparent plastics?
    Soak Method
  58. When holes are drilled completely through Plexiglas, a
    specially modified twist drill should be used.
  59. What is the purpose of a gusset or gusset plate used in the construction and repair of aircraft structures?
    To join and reinforce intersecting structural members.
  60. Select the alternative which best describes the function of the flute section of a twist drill.
    Forms the cutting edges of drill points.
  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?
  62. Longitudinal (fore and aft) structural members of a semi-monocoque fuselage are called
    longerons and stringers
  63. Shallow scratches in sheet metal may be repaired by
  64. What should be the included angle of a twist drill for soft metals?
    90 degrees
  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
    Lower speed with more pressure applied to the drill.
  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
    13/16 inch
  67. Which statement is true regarding the inspection of a stressed skin metal wing assembly known to have been critically loaded?
    If genuine rivet tipping has occurred, groups of consecutive rivet heads will be tipped in the same direction.
  68. What is the minimum edge distance for aircraft rivets?
    Two times the diameter of the rivet shank.
  69. When drilling stainless steel, the drill used should have an included angle of
    140 degrees and turn at a low speed.
  70. What is the minimum spacing for a single row of aircraft rivets?
    Three times the diameter of the rivet shank.
  71. (Refer to Figure 1.) Which of the rivets shown will accurately fit the conical depression made by a 100° countersink?
  72. Which is correct concerning the use of a file?
    Apply pressure on the forward stroke, only, except when filing very soft metals such as lead or aluminum.
  73. What is one of the determining factors which permits machine countersinking when flush riveting?
    Thickness of the material is greater than the thickness of the rivet head.
  74. When repairing a small hole on a metal stressed skin, the major consideration in the design of the patch should be
    the shear strength of the riveted joint.
  75. Which procedure is correct when using a reamer to finish a drilled hole to the correct size?
    Turn the reamer in the cutting directions.
  76. Repairs or splices involving stringers on the lower surface of stressed skin metal wings are usually
    permitted but are normaly more critical in reference to strength in tension than similar repairs to the upper surface.
  77. When straightening members made of 2024-T4, you should
    straighten cold and reinforce
  78. Clad aluminum alloys are used in aircraft because they
    are less subject to corrosion than uncoated aluminum alloys.
  79. Which statement is true regarding a cantilever wing?
    No external Bracing is needed.
  80. Aircraft structural units, such as spars, engine supports, etc., which have been built up from sheet metal, are normally
    repairable, using approved methods
  81. A factor which determines the minimum space between rivets is the
    Diameter of the rivets being used.
  82. What should be the included angle of a twist drill for hard metal?
    118 degrees
  83. When fabricating parts from Alclad 2024-T3 aluminum sheet stock,
    All scratches, kinks, tool marks, nicks, ect. must be held to a minimum.
  84. The monocoque fuselage relies largely on the strength of
    Skin or Covering
  85. Which part(s) of a semi-monocoque fuselage prevent(s) tension and compression from bending the fuselage?
    Longerons and Stringers
  86. Rivet gauge, or transverse pitch is the distance between the
    center of rivets in adjacent rows
  87. Rivet pitch is the distance between the
    center of adjacent rivets in the same row
  88. (Refer to Figure 2.) Select the preferred drawing for proper countersinking.
  89. What is indicated by a black 'smoky' residue streaming back from some of the rivets on an aircraft?
    Fretting corrosion is occuring between the rivets and the skin.
  90. The identifying marks on the heads of aluminum alloy rivets indicate the
    specific alloy used in manufacture of the rivets.
  91. When an MS20470D rivet is installed, its full shear strength is obtained
    only after a period of age hardening.
  92. Which of the following need not be considered when determining minimum rivet spacing?
    Rivet Length
  93. What is the purpose of refrigerating 2017 and 2024 aluminum alloy rivets after heat treatment?
    To retard age hardening.
  94. Under certain conditions, type A rivets are not used because of their
    Low strength characteristics.
  95. A rivet set used to drive MS20470 rivets should
    Have a slightly greater radius than the rivet head.
  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
    must be reheat treated before use
  97. The dimensions of an MS20430AD-4-8 rivet are
    1/8 in diameter and 1/2 inch long
  98. The primary alloying agent of 2024-T36 is indicated by the number
  99. Which part of the 2017-T36 aluminum alloy designation indicates the primary alloying agent used in its manufacture?
  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
    1/4 inch
  101. Most rivets used in aircraft construction have
  102. MS20426AD-6-5 indicates a countersunk rivet which has
    An overall length of 5/16 inch.
  103. Which rivet may be used as received without further treatment?
    2117 - T3
  104. (Refer to Figure 3.) Which is the grip length of the flush rivet?
  105. Which rivets should be selected to join two sheets of .032-inch aluminum?
  106. 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
    5/16 inch
  107. Mild steel rivets are used for riveting
    steel parts
  108. A DD rivet is heat treated before use to
    soften to facilitate riveting
  109. When riveting dissimilar metals together, what precautions must be taken to prevent an electrolytic action?
    Place a protective seperator between the areas of potential electrical difference.
  110. The length of a rivet to be used to join a sheet of .032-inch and .064-inch aluminum alloy should be equal to
    one and one-half times the rivet diameter plus .096 inch.
  111. What is generally the best procedure to use when removing a solid shank rivet?
    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.
  112. Joggles in removed rivet shanks would indicate partial
    shear failure
  113. What type loads cause the most rivet failures?
  114. Which rivet is used for riveting magnesium alloy structures?
    5056 Aluminum
  115. Which rivet is used for riveting nickel-steel alloys?
  116. 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
    5/16 Inch
  117. (Refer to Figure 4.) The length of flat A is
    3.750 inches
  118. (Refer to Figure 4.) The amount of material required to make the 90° bend is
    0.3436 inch
  119. (Refer to Figure 5.) What is the length of flat A?
    3.7 inches
  120. (Refer to Figure 5.) What is the flat layout dimension?
    6.8 inches
  121. 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
    Started by tapping the aluminum lightly around the edges and gradually working down into the center.
  122. A piece of flat stock that is to be bent to a closed angle of 15° must be bent through an angle of
    165 degrees
  123. When a piece of aluminum alloy is to be bent using a minimum radius for the type and thickness of material,
    the layout should be made so that the bend will be 90 degrees to the grain of the sheet.
  124. 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
    1/8 inch
  125. 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
    Found by adding aproximately one-half of stock thickness to the bend radius.
  126. Unless otherwise specified, the radius of a bend is the
    inside radius of the metal being formed.
  127. The sharpest bend that can be placed in a piece of metal without critically weakening the part is called the
    minimum radius of bend
  128. The most important factors needed to make a flat pattern layout are
    radius, thickness, and degree of bend.
  129. A piece of sheet metal is bent to a certain radius. The curvature of the bend is referred to as the
    bend radius
  130. You can distinguish between aluminum and aluminum alloy by
    testing with a 10 percent solution of caustic soda
  131. The purpose of a joggle is to
    allow clearance for a sheet or an extrusion
  132. 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
    neutral line
  133. (Refer to Figure 6.) Determine the dimensions of A, B, and C in the flat layout.Setback = .252Bend allowance = .345
    A = .748, B = 1.496, C = 1.248
  134. (Refer to Figure 6.) What is dimension D?Setback = .252Bend allowance = .345
  135. The sight line on a sheet metal flat layout to be bent in a cornice or box brake is measured and marked
    one radius from the bend tangent line that is placed under the brake.
  136. (Refer to Figure 7.) What is dimension F?Setback at D = .095Setback at E = .068Bend allowance at D = .150Bend allowance at E = .112
  137. On a sheet metal fitting layout with a single bend, allow for stretching by
    subracting the setback from both legs.
  138. The aluminum alloys used in aircraft construction are usually hardened by which method?
    Heat Treatment