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3 wood and composite
| Question | Answer |
|---|---|
| What are the three forms of wood commonly used in aircraft construction? | Solid, laminated, and plywood. |
| What type of wood should be used when splicing or reinforcing plywood webs? | The same type of plywood as originally used. |
| Name at least four different types of defects found in wood. | Knots, checks, splits, pitch pockets, cross grain, curly grain, decay, dry rot, etc. |
| Can a section of wood containing a hard knot be used? | Yes, within specified limits |
| What type of glue may have been used in older wooden aircraft construction that requires careful inspection to detect deterioration? | Casein glue |
| What are the three types of glues used in modern aircraft construction and repair? | Resorcinol glue, phenol-formaldehyde glue and epoxy resin glue. |
| Is compression wood acceptable for structural repairs? | No |
| Why should the various pieces of wood being joint be kept in the same room for at least 24 hours prior to joining? | To allow the moisture content to equalize, there by minimizing dimensional changes in the wood. |
| Why is it important to consider the open-assembly time when gluing wooden structures? | If the maximum open-assembly time is exceeded, the joint may fail since the glue may begin setting up before the joint is assembled. |
| Why is it important to apply the proper clamping pressure to a glue joint? | Clamping forces air out of the joint, brings the wood surface this together evenly and he is, and part, responsible for the strength of the glue line. |
| Describe some of the methods used to apply pressure to glue joints. | Clamps, nailing strips, power presses, brads, nails, and small screws |
| What minimum curing temperature should be observed when joining wood with various adhesives? | 70 degrees Fahrenheit or as specified by the glue manufacturer. |
| When inspecting wood structures, why might it be important to consider stains and discolored areas? | Stains and discoloration usually accompany Decay and or dry rot. |
| Describe the acceptable methods used to repair elongated bolt holes found in a wooden Wing spar. | Remove the section containing the elongated hole(s) and splice in a new section or replace the entire spar. |
| What type of joint is used to splice a solid or rectangular wood spar? | A scarf joint. |
| In what areas are splices to wood spar prohibited? | Under an attachment fitting for the wing root, landing gear, engine-mount, lift or inter-plane strut. |
| What is the maximum number of splices allowed for any single spar? | Two |
| Describe the characteristics of a scarf joint. | The pieces to be joined are tapered or beveled on a slope of 1 to 10 or 1 to 12. |
| Why must the beveled cut be accurate on both pieces of wood being repaired with a scarf joint? | The two pieces must match exactly to ensure a tight glue joint. |
| What are the two primary uses for plywood in aircraft Construction? | Guessets (or reinforcing) plates and aircraft skin. |
| Provide examples of at least three types of plywood skin repairs. | Splayed patches, surface patches, plug patches, and scarfed patches |
| What type of patch should be used to repair small holes in thin plywood skin if the skin is less than 1/10th inch thick? | A splayed patch may be used if the hole can be cleared out to a diameter of less than 15 thickness of the skin. |
| What should be done to prevent a plywood patch and the pressure plate from sticking together if glue is extruded from the joint? | Place a piece of waxed paper or vinyl plastic between the patch and the pressure plate. |
| Why are lightweight steel bushings sometimes used in wooden structures? | Bushings prevent the wood from being crushed when bolts are tightened. |
| What is the purpose of large surface area washers when used on wooden structures? | Large washers provide additional bearing area for hardware to help preclude damage to the wood when the hardware is tightened. |
| Name several facings in core materials used in bonded honeycomb structures intended for special applications. | Stainless steel, titanium, magnesium, plywood, glass, nylon, and cotton cloth. |
| Describe the construction of a bonded honeycomb structure. | It is a laminated structure that has a solid facing bonded to either side of a core consisting of open, six sided cells. |
| What must be done with a damaged area in a bonded honeycomb structure prior to beginning repairs? | The damaged area must be completely removed. |
| A drill bit used for drilling composites should have an included angle of how many degrees? | 135 degrees |
| What are the most common causes for delamination of a composite structure? | Sonic vibration, expansion of internal moisture, liquid leakage, and a manufacturing error. |
| What type of defect in, or damage to, a bonded honeycomb structure can be repaired using the potted repair method? | Filling a hole. |
| Name some of the factors that cause crazing in transparent plastic windows and windshields? | Exposure to ultraviolet light, stress, solvents, and improper handling. |
| How should a hole be drilled in Plexiglas® to avoid damage to the hole when the drill breaks through to the underside? | Back up the plastic with a piece of wood in feed the drill slowly. |
Created by:
Big.Bear.M
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