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A faint line running across the grain of a wood spar generally indicates
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The I-beam wooden spar is routed to
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Peters2210
2210 final review
| Question | Answer |
|---|---|
| A faint line running across the grain of a wood spar generally indicates | a. Compression Failure b. Shear Failure c. Decay |
| The I-beam wooden spar is routed to | a. Increase strength b. Obtain uniform strength c. Reduce weight |
| The strength of a well-designed and properly prepared wood splice joint is provided by the | a. Bearing surface of the wood fibers b. Glue c. Reinforcement plates |
| Any wooden member that has been overstressed is subject to which type of failure? | a. Stretch b. Compression c. Torsion |
| Where is information found concerning acceptable species substitutions for wood materials used in aircraft repair? | a. AC 43.13-1B b. Aircraft Specification or TCDS c. Technical Standard Orders |
| Which of the following conditions will determine acceptance of wood with mineral streaks? | a. Careful inspection fails to reveal any decay b. They produce only a small effect on grain direction c. Local irregularities do not exceed limitations specified for spiral diagonal grain |
| Which statement concerning wood decay is correct? | a. Decay that appears to be mineral streaks is acceptable. b. A limited amount of decay along the beveled edges of unrouted beams is acceptable. c. Any form or amount of decay is not permitted. |
| Pin knot clusters are permitted in wood aircraft structure provided | a. They produce a small effect on grain direction b. They have no mineral streaks c. No pitch pockets are within 12 inches |
| Laminated wood spars may be substituted for solid rectangular wood spars | a. Only in certain instances where the primary load is shared by one or more other original structural member b. If the same quality wood is used in both c. Only upon specific approval by the manufacturer or the FAA |
| Glue deterioration in wood aircraft structure is indicated | a. when a joint has separated and the glue surface shows only the imprint of the wood with no wood fibers clinging to the glue. b. when a joint has separated and the glue surface shows pieces of wood and/or wood fibers clinging to the glue. |
| Compression failures in wood aircraft structures are characterized by buckling of the fibers that appear as streaks on the surface | a. At right angles to the growth rings b. Parallel to the grain c. At right angles to the grain |
| The strength classification of fabrics used in aircraft covering is based on | a. Bearing strength b. Shear strength c. Tensile strength |
| Fungicide and mildewcide additives are important for fabric covered aircraft, such as | a. Cotton and Dacron b. Cotton and linen c. Glass and linen |
| Moisture, mildew, chemicals, and acids have no effect on | a. Glass fabric b. Cotton fabric c. Polyester fabric |
| When testing the strength of Grade A cotton fabric covering an aircraft that requires only intermediate grade, the minimum acceptable strength the fabric must have is | a. 70 percent of its original strength. b. 70 percent of the original strength for intermediate fabric. c. 56 pounds per inch warp and fill. |
| When dope-proofing the parts of the aircraft structure that come in contact with doped fabric, which of the following provide an acceptable protective coating? | a. Resin impregnated cloth tape and cellulose tape. b. Aluminum foil and resin impregnated cloth tape. c. Aluminum foil and cellulose tape. |
| When and how is finishing tape applied on a fabric-covered aircraft? | a. Sewed or laced on before dope is applied. b. Doped on immediately prior to the finish coat. c. Doped on after the first or second coat of dope. |
| Finishing tape (surface tape) is used for what purpose? | a. To help prevent 'ripple formation' in covering fabric. b. To provide additional wear resistance over the edges of fabric forming structures. c. To provide additional anti-tear resistance under reinforcement tape. |
| Which statement is true regarding paint system compatibility? | a. Old-type zinc chromate primer may not be used directly for touchup of bare metal surfaces. b. Acrylic nitrocellulose lacquers may be used over old nitrocellulose finishes. c. Old wash primer coats may be overcoated directly with epoxy finishes. |
| Which defect in aircraft finishes may be caused by adverse humidity, drafts, or sudden changes in temperature? | a. Orange peel b. Blushing c. Pinholes |
| Which type of coating typically includes phosphoric acid as one of its components at the time of application? | a. Wash primer b. Epoxy primer c. Zinc chromate primer |
| What is used to slow the drying time of some finishes and to prevent blush? | a. Reducer b. Retarder c. Rejuvenator |
| Which properly applied finish topcoat is the most durable and chemical resistant? | a. Synthetic enamel b. Acrylic lacquer c. Polyurethane |
| Aluminum pigment in dope is used primarily to | a. provide a silver color. b. aid in sealing out moisture from the fabric. c. reflect ultraviolet from the fabric. |
| What is the usual cause of runs and sags in aircraft finishes? | a. Too much material applied in one coat. b. Material is being applied too fast. c. Low atmospheric humidity |
| Before applying a protective coating to any unpainted clean aluminum, you should | a. wipe the surface with methyl ethyl ketone (MEK). b. remove any contaminants from the surface with a paper towel. c. avoid touching the surface with bare hands. |
| Which of the following is a hazard associated with sanding on fabric covered surfaces during the finishing process? | a. Overheating of the fabric/finish, especially with the use of power tools b. Static electricity buildup. c. Embedding of particles in the finish. |
| Fungicidal dopes are used in aircraft finishing as the | a. first, full-bodied, brushed-on coat to prevent fungus damage. b. first coat to prevent fabric rotting and are applied thin enough to saturate the fabric. c. final, full-bodied, brushed-on coat to reduce blushing. |
| 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 |
| What type of bit should be used to drill holes in Plexiglass? | a. A standard twist drill. b. A specially modified twist drill. c. A dulled twist drill. |
| A category of plastic material that is capable of softening or flowing when reheated is described as a | a. Thermoplastic b. Thermocure c. Thermoset |
| Which of the following are benefits of using microballoons when making repairs to laminated honeycomb panels? | a. Improved strength-to-weight ratio, less density, and lower stress concentrations. b. Greater concentrations of resin in edges and corners. c. Less density and improved strength-to-weight ratio. |
| Which of the following are generally characteristic of aramid fiber (Kevlar) composites? | a. High tensile strength and flexibility. b. High tensile strength and stiffness. c. Corrosive effect in contact with aluminum and ability to conduct electricity. |
| 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. |
| 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 |
| Composite fabric material is considered to be the strongest in what direction? | a. Fill b. Warp c. Bias |
| 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 |
| 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 b. Soap and water c. Thixotropic agent |
| 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). |
| Repairing advanced composites using materials and techniques traditionally used for fiberglass repairs is likely to result in | a. restored strength and flexibility. b. slightly stronger strength to weight ratio. c. an unairworthy repair. |
| 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. |
| The classification for high tensile strength fiberglass used in aircraft structures is | a. E-glass b. S-glass c. G-glass |
| Which of the following are generally characteristic of carbon/graphite fiber composites? | a. Flexibility, high compressive strength, and corrosive effect in contact with aluminum. b. Stiffness, high compressive strength, and corrosive effect in contact with aluminum. c. Ability to conduct electricity. |
| 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. |
| 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 |
| Sandwich panels made of honeycomb construction are used on aircraft because this type of construction | a. has a high tensile strength and is non-flammable. b. has a low weight and is corrosion resistant. c. saves weight while not compromising strength. |
| What precaution, if any, should be taken to prevent corrosion inside a repaired 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. |
| 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. |
| Which fiber to resin (percent) ratio for advanced composite wet lay-ups is generally considered the best for strength? | a. 40:60 b. 50:50 c. 60:40 |
| 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. |
| 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. |
| Proper prepreg composite lay-up curing is generally accomplished by | a. adding a catalyst or curing agent to the resin. b. applying external heat and pressure. c. room temperature exposure and applying pressure. |
| The length of time that a catalyzed resin will remain in a workable state is called the | a. Pot life b. Work life c. Plyable life |
| 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. |
| 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. |
| When conducting a tap test on a composite panel, which of the following sounds would indicate delamination? | a. Sharp ringing b. Dull thud c. Sharp thud |
| 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 |
| When necessary, what type of cutting fluid is usually acceptable for machining composite laminates? | a. Water soluble oil. b. Water displacing oil. c. Water. |
| 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. b. sanding the damaged area until aerodynamic smoothness is obtained. c. trimming the rough edges and sealing with paint. |
| 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. |
| Which of the following, when added to wet resins, provide strength for the repair of damaged fastener holes in composite panels? | a. Flox and chopped fibers. b. Microballons. c. Microballons and flox. |
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cpeters2
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