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Sheet metal
Airframe Written
| Question | Answer |
|---|---|
| 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. |
| 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 approximately one-half of the stock thickness to the bend radius. |
| The dimensions of an MS20430AD-4-8 rivet are | 1/8 inch in diameter and 1/2 inch long. |
| Which rivets should be selected to join two sheets of .032-inch aluminum? | MS20470AD-4-4. |
| Threaded rivets (Rivnuts) are commonly used to | attach parts or components with screws to sheet metal. |
| Which is considered good practice concerning the installation of acrylic plastics? | When rivets are used, adequate spacer or other satisfactory means to prevent excessive tightening of the frame to the plastic should be provided. |
| Which rivet is used for riveting nickel-steel alloys? | monel |
| 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 |
| 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 |
| Select the alternative which best describes the function of the flute section of a twist drill. | forms the cutting edges of the drill point |
| You can distinguish between aluminum and aluminum alloy by | testing with a 10 percent solution of caustic soda |
| Rivet gauge, or transverse pitch is the distance between the | centers of rivets in adjacent rows. |
| 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 |
| 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. |
| What is the minimum spacing for a single row of aircraft rivets? | Three times the diameter of the rivet shank. |
| The markings on the head of a Dzus fastener identify the | body diameter, type of head, and length of fastener |
| Clad aluminum alloys are used in aircraft because they | have surface layers of pure aluminum or aluminum alloy bonded to the core material to inhibit corrosion. |
| 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 |
| 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? | 56 |
| The purpose of a joggle is to | allow clearance for a sheet on an extrusion |
| The general rule for finding the proper rivet diameter is | three times the thickness of the thickest sheet |
| A rivet set used to drive MS20470 rivets should | have a slightly greater radius than the rivet head |
| The classification for fiberglass reinforcement material that has high resistivity and is the most common is | E-glass |
| 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. |
| The classification for high tensile strength fiberglass used in aircraft structures is | S-glass |
| A well-designed rivet joint will subject the rivets to | Shear loads |
| What is the minimum edge distance for aircraft rivets? | two times the diameter of the rivet shank |
| What is the most common method of cementing transparent plastics? | soak method |
| Which parts of a semi-monocoque fuselage prevent tension and compression from bending the fuselage? | Longerons and stringers |
| What is the purpose of refrigerating 2017 and 2024 aluminum alloy rivets after heat treatment? | to retard age hardening |
| 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 |
| Shallow scratches in sheet metal may be repaired by | burnishing |
| What should be the included angle of a twist drill for soft metals? | 90° |
| When inspecting a composite panel using the ring test/tapping method, a dull thud may indicate | separation of the laminate |
| Which of the following are generally characteristic of carbon/graphite fiber composites? | stiffness, high compressive strength, and corrosive effect in contact with aluminum |
| 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 |
| What reference tool is used to determine how the fiber is to be oriented for a particular ply of fabric? | Warp clock (or compass) |
| The most important factors needed to make a flat pattern layout are | radius, thickness, and degree of bend |
| The shop head of a rivet should be | one and one-half times the diameter of the rivet shank |
| Repairing advanced composites using materials and techniques traditionally used for fiberglass repairs is likely to result in | an unairworthy repair |
| The Dzus turnlock fastener consists of a stud, grommet, and receptacle. The stud length is measured in | hundredths of an inch |
| Composite fabric material is considered to be the strongest in what direction? | warp |
| Under certain conditions, type A rivets are not used because of their | low strength characteristics |
| When repairing puncture-type damage to a metal-faced laminated honeycomb panel, the edges of the doubler should be tapered to | 100 times the thickness of the metal |
| The Dzus turnlock fastener consists of a stud, grommet, and receptacle. The stud diameter is measured in | sixteenths of an inch |
| What type loads cause the most rivet failures? | shear |
| When straightening members made of 2024-T4, you should | straighten cold and reinforce |
| MS20426AD-6-5 indicates a countersunk rivet which has | an overall length of 5/16 inch |
| 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 |
| What is a rivet's grip length? | the total thickness of the material held together by the rivet |
| Which of the following is one advantage of HI-LOK fasteners? | inability to be over-torqued |
| On a sheet metal fitting layout with a single bend, allow for stretching by | subtracting the setback from both legs |
| The monocoque fuselage relies largely on the strength of | skin or covering |
| A DD rivet is heat treated before use to | soften to facilitate riveting |
| Parts manufactured from Alcald 2024-T3 aluminum sheet stock must have all | scratches, kinks, tool marks, nicks, etc., must be held to a minimum |
| The identifying marks on the heads of aluminum alloy rivets indicate the | specific alloy used in the manufacture of the rivets |
| When installing transparent plastic enclosures which are retained by bolts extending through the plastic material and self-locking nuts, the nuts should be | tightened to a firm fit, then backed off one full turn |
| 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 |
| Hole filling fasteners (for example, MS20470 rivets) should not be used in composite structures primarily because of the | possibility of causing delamination |
| 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 heat treated before use |
| Which of these methods may be used to inspect fiberglass/honeycomb structures for entrapped water? | X-ray and backlighting |
| (Refer to Figure 7.) What is dimension F? Setback at D = .095 Setback at E = .068 Bend allowance at D = .150 Bend allowance at E = .112 | 5.936 |
| Rivet pitch is the distance between the | centers of adjacent rivets in the same row |
| Which rivet is used for riveting magnesium alloy structures? | 5056 aluminum |
| Which of the following need not be considered when determining minimum rivet spacing? | Rivet length |
| The sharpest bend that can be placed in a piece of metal without critically weakening the part is called the | minimum radius of bend |
| If no scratches are visible after transparent plastic enclosure materials have been cleaned, their surfaces should be | covered with a thin coat of wax |
| 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 |
| Which is an identifying characteristic of acrylic plastics? | Zinc chloride will have no effect |
Created by:
mattpayne001