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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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| Question | Answer |
|---|---|
| A faint line running across the grain of a wood spar generally indicates? | Compression Failure |
| The I-beam wooden spar is routed to? | Reduce weight |
| The strength of a well-designed and properly prepared wood splice joint is provided by the? | Glue |
| Any wooden member that has been overstressed is subject to which type of failure? | Compression |
| Where is information found concerning acceptable species substitutions for wood materials used in aircraft repair? | AC 43.13-1B |
| Which of the following conditions will determine acceptance of wood with mineral streaks? | Careful inspection fails to reveal any decay |
| Which statement concerning wood decay is correct? | Any form or amount of decay is not permitted. |
| Pin knot clusters are permitted in wood aircraft structure provided? | They produce a small effect on grain direction. |
| laminated wood spars may be substituted for solid rectangular wood spars? | If the same quality wood is used in both |
| Glue deterioration in wood aircraft structure is indicated? | when a joint has separated and the glue surface shows only the imprint of the wood with no 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? | At right angles to the grain |
| The strength classification of fabrics used in aircraft covering is based on? | Tensile strength |
| fungicide and mildewicide additives are important for fabric covered aircraft, such as? | Cotton and linen |
| Moisture, mildew, chemicals, and acids have no effect on? | Glass 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? | 70 percent of the original strength for intermediate fabric. |
| 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? | Aluminum foil and cellulose tape. |
| When and how is finishing tape applied on a fabric-covered aircraft? | Doped on after the first or second coat of dope. |
| Finishing tape (surface tape) is used for what purpose? | To provide additional wear resistance over the edges of fabric forming structures. |
| Which statement is true regarding paint system compatibility? | 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? | Blushing |
| Which type of coating typically includes phosphoric acid as one of its components at the time of application? | Wash primer |
| What is used to slow the drying time of some finishes and to prevent blush? | Retarder |
| Which properly applied finish topcoat is the most durable and chemical resistant? | Polyurethane |
| Aluminum pigment in dope is used primarily to? | reflect ultraviolet from the fabric. |
| What is the usual cause of runs and sags in aircraft finishes? | Too much material applied in one coat |
| Before applying a protective coating to any unpainted clean aluminum, you should? | 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? | Static electricity buildup |
| Fungicidal dopes are used in aircraft finishing as the | first coat to prevent fabric rotting and are applied thin enough to saturate the fabric. |
| The classification for fiberglass reinforcement material that has high resistivity and is the most common is? | E-glass |
| What type of bit should be used to drill holes in Plexiglass? | A specially modified twist drill. |
| A category of plastic material that is capable of softening or flowing when reheated is described as a | Thermoplastic |
| Which of the following are benefits of using microballoons when making repairs to laminated honeycomb panels? | Improved strength-to-weight ratio, less density, and lower stress concentrations. |
| Which of the following are generally characteristic of aramid fiber (Kevlar) composites? | High tensile strength and flexibility. |
| Fiberglass laminate damage that extends completely through one facing and into the core? | requires the replacement of the damaged core and facing. |
| Which of the following drill bit types work best when drilling an aramid fiber (Kevlar) composite laminate? | Carbide W-point |
| Composite fabric material is considered to be the strongest in what direction? | Warp |
| How does acoustic emission testing detect defects in composite materials? | By picking up the 'noise' of any deterioration that may be present. |
| 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 |
| What reference tool is used to determine how the fiber is to be oriented for a particular ply of fabric? | Warp clock (or compass)? |
| Repairing advanced composites using materials and techniques traditionally used for fiberglass repairs is likely to result in? | an unairworthy repair |
| One method of inspecting a laminated fiberglass structure that has been subjected to damage is to | strip the damaged area of all paint and shine a strong light through the structure. |
| The classification for high tensile strength fiberglass used in aircraft structures is | S-glass |
| Which of the following are generally characteristic of carbon/graphite fiber composites? | Stiffness, high compressive strength, and corrosive effect in contact with aluminum. |
| 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 |
| The part of a replacement honeycomb core that must line up with the adjacent original is the | ribbon direction |
| Sandwich panels made of honeycomb construction are used on aircraft because this type of construction | saves weight while not compromising strength. |
| 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. |
| When inspecting a composite panel using the ring test/tapping method, a dull thud may indicate | separation of the laminates. |
| Which fiber to resin (percent) ratio for advanced composite wet lay-ups is generally considered the best for strength? | 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 | use short strips of fiberglass in the bonded repair. |
| The strength and stiffness of a properly constructed composite buildup depends primarily on | the orientation of the plies to the load direction |
| Proper prepreg composite lay-up curing is generally accomplished by | applying external heat and pressure. |
| The length of time that a catalyzed resin will remain in a workable state is called the | Pot life |
| The preferred way to make permanent repairs on composites is by | laminating on new repair plies |
| Fiberglass damage that extends completely through a laminated sandwich structure? | May be repaired |
| When conducting a tap test on a composite panel, which of the following sounds would indicate delamination? | Dull thud |
| What is the material layer used within the vacuum bag pressure system to absorb excess resin during curing called? | Bleeder |
| When necessary, what type of cutting fluid is usually acceptable for machining composite laminates? | Water |
| 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. |
| 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 |
| Which of the following, when added to wet resins, provide strength for the repair of damaged fastener holes in composite panels? | Flox and chopped fibers |
| What is the danger of a wooden aircraft structure in which the wood holds moisture content of over 20% | The growth of fungus |
| In order to properly inspect wood structure of an aircraft, the wooden components must be. | Dry |
| Glued joints are typically designed to take what type of load? | Shear |
| A faint line running across the grain of a wood spar generally indicates | Compression failure |
| Which of the following types of wood has the greatest strength properties | Douglas Fir |
| The slope of the grain of any wood used for aircraft may not be greater than | 1:15 |
| In what circumstances are the presence of pin knot clusters acceptable on a structural member of a wooden aircraft | If their effect on the grain direction is minimal |
| Compression failures in wood aircraft structures are characterized by buckling of the fibers that appear as streaks on the surface? | At right angles to the grain |
| Which of the following is most important for successful gluing of structural wood joints. | The ambient temperature |
| If the allowable temperature of a wood adhesive is listed as 62-80 degrees, at what temperature will the usable pot life be longest | 62 degrees |
| When bevel is being cut to repair a cap strip on a wing rib, the length of the beveled area should be | 10 times the thickness of the rib cap strip |
| What is the purpose of a gusset plate used in the construction and repair of aircraft structures | To join and reinforce intersecting structural members |
| If elongated bolt holes are discovered while inspecting a wooden wing spar, which is the minimum required repair | The section of spar or the entire spar must be replaced |
| Holes bored for bolts which will hold fittings in place should be cut | To match the hole diameter of the fitting |
| In what circumstances are mineral streaks found in wood to be used for structural repair acceptable | As long as decay is not found in the streaked area |
| When patching a plywood skin, abrupt changes in the cross sectional area which will develop dangerous stress concentration should be avoided by using | Circular or elliptical patches |
| When installing a plug patch to repair a plywood skin, to what size is the patch cut | To the exact dimension of the hole |
| The strength and stiffness of a properly constructed composite buildup depends primarily on | the orientation of the plies. |
| Composite fabric material is considered to be the strongest in what direction? | Warp |
| 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 classification for high tensile strength fiberglass used in aircraft structures is | S-glass. |
| Which of the following are generally characteristic of Aramid fiber (Kevlar®) composites? 1. High tensile strength 2. Flexibility 3. Stiffness 4. High compressive strength 5. Ability to conduct electricity | 1 and 2 |
| 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 | 2, 3, and 4 |
| The maximum tensile strength of fiber reinforced plastic is achieved using | unidirectional fibers. |
| Lightning protective fibers on aircraft provide | less electrically resistive surface to aid in lightning dissipation. |
| The principle advantage of polyimide resin is that it offers | high temperature resistance. |
| The curing process of a mixed resin may be temporarily stopped by. | placing it in a freezer |
| On a prepreg composite tape, once the chemical reaction within the resin has begun, | the tape is ready to be applied. |
| Which composite adhesive type must be stored at the oldest temperature of the three? | Film adhesives |
| Which fiber to resin (percent) ratio for advanced composite wet lay-ups is generally considered the best for strength? | 60:40 |
| The most frequent cause of damage to composite parts are | impacts to the surface by debris |
| Corrosion is a factor with composite aircraft components when | lighting protective plies are installed |
| Tap testing of a composite structure produces the most detectable results on | thin composite honeycomb skin. |
| When inspecting a composite panel using the ring test/ coin test tapping method, a dull thud sound may indicate | a delamination In the matrix mix |
| Composite inspections conducted by means of ultrasonic monitoring | pick up the "noise" of corrosion or other deterioration occurring. |
| Which of the following is an advantage of prepreg composites? | Does not have a problem of a lean or rich mix. |
| What is the material layer used within the vacuum bag pressure system to absorb excess resin during curing called? | Bleeder |
| The principle advantage to curing composite parts with an autoclave versus a standard oven is | allows curing in higher temperatures and pressures. |
| When curing an on-aircraft composite repair, a heat blanket is used to maintain the proper curing temperature. What is used to insure a proper contact between the blanket and the part? | Vacuum Bags |
| The minimum number of thermocouples used to monitor a heat cycle is | no fewer than three |
| To prevent premature curing, all prepreg materials must be stored | in a refrigerated environment under 0°F |
| The principle benefit of vacuum bagging over a wet layup is it | removes excess resin uniformly from the structure. |
| The maximum design properties of a fiberglass component are achieved at what curing temperature | 150°F |
| A potted compound repair on honeycomb can usually be made on damages less than | 5 inches in diameter. |
| Sandwich panels made of honeycomb construction are used on aircraft because this type of construction. | saves weight while not compromising strength. |
| Which is not a step to ensure proper bonding of a composite patch to an aluminum surface | install anchor tabs on the aluminum surface. |
| The purpose of a double vacuum debulk process when repairing laminated fiberglass structures is to remove | air from between the laminations. |
| Metal fasteners which may be used with repairs of carbon fiber structures are made from? | Titanium |
| The principle difference between composite structure fasteners and metal structure fasteners is that composite fasteners | have larger bearing surfaces. |
| When drilling into composite structures the general rule is to use | high speed, low pressure drills. |
| The best cutting tool to use on composite honeycomb structures is a | toothless diamond coated saw blade. |
| Health problems resulting from composite repair processes are best avoided by. | consulting Material Data Safety Sheets (MSDS). |
| Which of the following is true regarding thermoplastics versus thermosetting plastics? | Thermoplastics must be stored in a cool and dry location. |
| What is the cause of crazing on an acrylic plastic panel? | It was heated to an excess temperature when forming |
| When drilling through acrylic plastics, a drill bit with an included tip angle of is recommended. | 150° |
| Which is true regarding the use of polymerizable cements with transparent plastics? | Remaining beads of cement are easily machined off. |
| When installing transparent plastic enclosures that 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. |
| Which is considered good practice concerning the installation of acrylic plastics? | When rivets are used, drill the mounting holes through the plastic oversize by 1/8 inch. |
| Which of the following is an acceptable combination of materials and its fasteners? | Kevlar composite materials with cadmium coated fasteners. |
Created by:
Lucas1999