NON METALLIC STRUCTURE 4

Pin knot clusters are permitted in wood aircraft structure provided. they produce a small effect on grain direction. they have no mineral streaks. no pitch pockets are within 12 inches.

What is the purpose of a gusset or gusset plate used in the construction and repair of aircraft structures?. To hold structural members in position temporarily until the permanent attachment has been completed. To provide access for inspection of structural attachments. To join and reinforce intersecting structural members.

The cantilever wing uses. external struts or wire bracing. no external bracing. the skin to carry most of the load to the wing butt.

Machine-sewn seams in aircraft covering fabrics may be of which of the following types?. Folded-fell or plain lapped. Folded-fell, French-fell, or plain lapped. French-fell or plain lapped.

The length of time that a catalyzed resin will remain in a workable state is called the. pot life. work life. plyable life.

Sandwich panels made of honeycomb construction are used on aircraft because this type of construction. has a high tensile strength and is non-flammable. has a low weight and is corrosion resistant. saves weight while not compromising strength.

When patching a plywood skin, abrupt changes in cross-sectional areas which will develop dangerous stress concentration should be avoided by using. circular or elliptical patches. square patches. doublers with any desired shaped patches.

What type of bit should be used to drill holes in Plexiglas?. A standard twist drill. A specially modified twist drill. A dulled twist drill.

Superficial scars, scratches, surface abrasion, or rain erosion on fiberglass laminates can generally be repaired by applying. a piece of resin-impregnated glass fabric facing. one or more coats of suitable resin (room-temperature catalyzed) to the surface. a sheet of polyethylene over the abraded surface and one or more coats of resin cured with infrared heat lamps.

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. when a joint has separated and the glue surface shows pieces of wood and/ or wood fibers clinging to the glue. by any joint separation.

The monocoque fuselage relies largely on the strength of. longerons and formers. skin or covering. bulkheads and longerons.

The determining factor (s) for the selection of the correct weight of textile fabric to be used in covering any type of aircraft is the. maximum wing loading. speed of the aircraft. speed of the aircraft and the maximum wing loading.

What is the material layer used within the vacuum bag pressure system to absorb excess resin during curing called?. Bleeder. Breather. Release.

Fabric rejuvenator is used to. restore the condition of dope coatings. restore fabric strength and tautness to at least the minimum acceptable level. penetrate the fabric and restore fungicidal resistance.

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. Microballoons. Microballoons and flox.

A category of plastic material that is capable of softening or flowing when reheated is described as a. thermoplastic. thermocure. thermoset.

Which is considered good practice concerning the installation of acrylic plastics?. When nuts and bolts are used, the plastic should be installed hot and tightened to a firm fit before the plastic cools. When rivets are used, adequate spacer or other satisfactory means to prevent excessive tightening of the frame to the plastic should be provided. When rivets or nuts and bolts are used, slotted holes are not recommended.

The strength of a well-designed and properly prepared wood splice joint is provided by the. bearing surface of the wood fibers. glue. reinforcement plates.

What is the most common method of cementing transparent plastics?. Heat method. Soak method. Bevel method.

When conducting a tap test on a composite panel, which of the following sounds would indicate delamination?. Sharp ringing. Dull thud. Sharp thud.

The strength classification of fabrics used in aircraft covering is based on. bearing strength. shear strength. tensile strength.

Cabin upholstery materials installed in current standard category airplanes must. be fireproof. be at least flame resistant. meet the requirements prescribed in Part 43.

One of the best ways to assure that a properly prepared batch of matrix resin has been achieved is to. perform a chemical composition analysis. have mixed enough for a test sample. test the viscosity of the resin immediately after mixing.