Term
| What species of wood is the standard . |
|
Definition
|
|
Term
| why must abrupt changes in cross sectional area be avoided. |
|
Definition
|
|
Term
| What is the difference between laminated wood and plywood. |
|
Definition
| in laminated wood the grain runs in the same direction. in plywood the layers cross at 90 and 45 degrees. |
|
|
Term
| What effect does moisture have on wood structure |
|
Definition
|
|
Term
| Can northern white pine be used as a subsitute for spruce |
|
Definition
| yes but it must be increased in size to compensate for lower strength. |
|
|
Term
| Which wood is more inclined to warp, flat grain of vertical grain |
|
Definition
|
|
Term
| How do u detect decay in a wood structure |
|
Definition
| stick a blade in to the suspect area and pry the wood up. if its good it will come up as a long splinter. if it is bad it will come up as a chunk. |
|
|
Term
| are mineral streaks in a piece of structural aircraft wood reason for rejection |
|
Definition
| No as long as there is no decay. |
|
|
Term
| how is compression wood indentified |
|
Definition
| it has high specific gravity. |
|
|
Term
| is a hard knot , 1/2 inch in diameter allowed if it is in the web of a wing spar. |
|
Definition
| No, 3/8 inch diameter is the maximum allowable knot, |
|
|
Term
| are pin knot clusters allowed |
|
Definition
| yes if only small effect on grain |
|
|
Term
| what kind of glue is recommended for aircraft repairs |
|
Definition
| Synthetic resin or resorcinol glue |
|
|
Term
| what reference material may be used for acceptable repairs in wooden aircraft structure. |
|
Definition
|
|
Term
| how is a scarf splice on a wing spar reinforced |
|
Definition
| solid spruce or plywood reincforceing plates are glued to side of spar |
|
|
Term
| what is the correct repair to a wooden aircraft wing spar in the holes are enlongated |
|
Definition
| splice in a new section of the spar and drill new holes. |
|
|
Term
| What is the minimum taper to use when repairing a wood wing rib cap strip |
|
Definition
| 12 times the thickness recommened |
|
|
Term
| how is plywood prepared for bending |
|
Definition
| soak in hot water until pliable |
|
|
Term
| how much pressure should be applied to a glue joint in a piece of softwood to produce a strong joint. |
|
Definition
|
|
Term
| what kind of repair is recommened for a hole in the plywood skin of the aircraft wing |
|
Definition
|
|
Term
| what is the minimum taper for a splayed patch |
|
Definition
|
|
Term
| What is the minimum taper for a scarf patch |
|
Definition
|
|
Term
| why should sand paper never be used when preparing a scarf joint in a wing for splicing |
|
Definition
| the dust will plug the pores not allowing the glue to stick |
|
|
Term
| what is the largest hole in a plywood wing skin that can be repaired with a fabric patch |
|
Definition
|
|
Term
| why are light steel bushings often used in bolt holes in a wood wing spar |
|
Definition
| the bushing keeps the spar from being crushed when the nut on the attachment bolt is tigthened |
|
|
Term
| how long should a glued joint be kept under pressure |
|
Definition
|
|
Term
| what area of the wood wing spar must not contain any splices. |
|
Definition
| no splice under wing attach fittings , landing gear fittings, engine mount fittings or lift interplane fittings |
|
|
Term
| what is done to a splice in a wood aircraft wing spar to strengthen the splice |
|
Definition
|
|
Term
| what reference is used for aircraft covering methods |
|
Definition
|
|
Term
| what are three types of fabric that can be used to cover an aircraft |
|
Definition
| cotton fabric, polyester fabric, glass fabric |
|
|
Term
| if changing the fabric covering what form must be filled |
|
Definition
|
|
Term
| what type of rib lacing cord is used to attach cotton fabric to an aircraft structure |
|
Definition
|
|
Term
| what is meant by the selvage edge |
|
Definition
| it is the woven edge of fabric used to prevent the material from unraveling during normal handleing |
|
|
Term
| why are some portions of an aircraft dope proofed beofre they are covered with fabric |
|
Definition
| dope proofing keeps the fabric from sticking to the structure |
|
|
Term
| what material is used for inter rib bracing in a fabric covered aircraft wing |
|
Definition
|
|
Term
| what is the preferred seam used for machine sewing pieces of the aircraft fabric. |
|
Definition
|
|
Term
| should the seam of aircaft covering run spanwise or chord wise |
|
Definition
|
|
Term
| what are two methods for applying the fabric to a wing |
|
Definition
| the blanket method and the envelope method |
|
|
Term
| what is used to cover overlapping edges and leading edge metal to protect fabric |
|
Definition
|
|
Term
| what are two methods of attaching the fabric to the aircraft structure |
|
Definition
| by sewing and with a cement |
|
|
Term
| how are wrinkles pulled out of cotton fabric |
|
Definition
| wet the cotton with water and allow to dry. |
|
|
Term
| how is polyester fabric shrunk on the aircraft structure |
|
Definition
|
|
Term
| what type of knot is used for locking the stitches that are used for rib lacing on a fabric covered aircraft wing |
|
Definition
|
|
Term
| what determines the spacing of the rib lacing |
|
Definition
|
|
Term
| when is finishing tape applied to a fabric covered wing when it is being recovered |
|
Definition
| after the second coat of dope has dried |
|
|
Term
| when are drainage grommets applied |
|
Definition
| they are laid into the third coat of dope |
|
|
Term
| what is done to cotton and linen fabric to protect it from mildew |
|
Definition
| the dope is mixed with a mildicide |
|
|
Term
| how wide should the surface tape be that is used to cover the traling edge of an wing |
|
Definition
|
|
Term
| what is the purpose of reinforcing tape used between the fabric and the rib lacing on an aircraft wing |
|
Definition
| the reinforcing tape keeps the cord from pulling through the fabric |
|
|
Term
| what is the minimum strength to which aircraft fabric is allowed to deteriorate. |
|
Definition
| can deteriorate by 30 percent |
|
|
Term
| how is the strength of a fabric tested |
|
Definition
| pull testing or fabric punch tester |
|
|
Term
| why should wooden spars be finished with a transparent varnish |
|
Definition
| it allows any deacy or ort to be detected easily |
|
|
Term
| why is a retarder used when dope is sprayed during humid conditions |
|
Definition
| it slows the drying time and keeps it from blushing |
|
|
Term
| when is fungicidal dope applied to fabric |
|
Definition
| with the first coat of dope |
|
|
Term
| what will happen if dope is sprayed over an enamled surface |
|
Definition
| the thinner in the dope will penetrate the enamel surface and cause it to swell. |
|
|
Term
| what are two basic types of dopes used |
|
Definition
| nitrate dope and butyrate dope |
|
|
Term
| what is meant by dope blushing and what causes it. |
|
Definition
| a condition in which moisture form the atmosphere condenses on the surface which causes a dull weak finish |
|
|
Term
| what can be done to remedy blushing |
|
Definition
| spray a light coat of retarder and thinner allow to dry and spray on another coat . if it doesent work the dope will have to sanded off and applied agian |
|
|
Term
|
Definition
| a slow drying finishing material that has potent dsolvents and plasticizers that soften a dried surface film and restore resilience to the film. |
|
|
Term
| does a rejuvenator restore strength to the fabric. |
|
Definition
| no it only restores the finish. |
|
|
Term
| why is the first coat brushed on to the fabric |
|
Definition
| to ensure thorough penetration and encapsulation of all the fibers |
|
|
Term
| what is the most common cause of dope roping |
|
Definition
| the dope was improperly thinned or it was too cold |
|
|
Term
| what causes pinholes in a dope finish |
|
Definition
| excessive atomizing air pressure on the spray gun |
|
|
Term
| why should the first coat of dope be thinned |
|
Definition
| to ensure througout penetration |
|
|
Term
| why is aluminum pigmented dope used on a fabric covered aircraft. |
|
Definition
| to protect the clear dope and the fabric from harmful effects of the sun |
|
|
Term
| how thick should a coat of wash primer be that is used on aluminum alloy aircraft structure |
|
Definition
| it should be thin enough that it does not hide the surface of the metal. |
|
|
Term
| when mixing epoxy paint should the converter be added resin or resin to the converter |
|
Definition
| converter should always be added to the resin |
|
|
Term
| what are three types of primer that may be used when painting the aircraft |
|
Definition
| zinc chromate primer , wash primer, and epoxy primer. |
|
|
Term
| what type of thinner is used with zinc chromate primer |
|
Definition
|
|
Term
| what type of primer is used when maximum protection is required |
|
Definition
|
|
Term
| what must be done to a correded aluminum alloy surface after the corrosion has been removed. |
|
Definition
| the surface should be treated with a coating before topcoats are applied. |
|
|
Term
| what may be done to the surface to prevent filiform corrosion beneath the topcaot |
|
Definition
| be sure that primer is properly and completely cured |
|
|
Term
| how is finish removed form fiberglass |
|
Definition
| finish must be sanded off |
|
|
Term
| how can vinyl film decal be removed form an aluminum alloy surface |
|
Definition
| place a cloth soaked in mek and scrape it off |
|
|
Term
| what causes poor adhesion between topcoat and fill coats on a fabric surface |
|
Definition
| too much aluminum powder in the aluminum pigmented dope |
|
|
Term
| what is a cause of a rough finish on a freshly painted surface |
|
Definition
| to high air pressure on gun |
|
|
Term
| what causes orange peel or spray mottle in a finish |
|
Definition
| incorrect paint viscosity or improper setting of the spray gun. |
|
|
Term
|
Definition
|
|
Term
|
Definition
|
|
Term
|
Definition
| the direction along the length of the fabric |
|
|
Term
| what are some different types of fabric that might be used in covering an aircraft |
|
Definition
| cotton, linen, dacron, glass cloth |
|
|
Term
|
Definition
| the finishing tape that is doped over ribs and seams |
|
|
Term
| what are three types of sewn seams that might be used in aircraft fabric covering |
|
Definition
| folded fell, french fell, and the plain overlap |
|
|
Term
| what knot is used for rib lacing |
|
Definition
|
|
Term
| what is an anti tear strip |
|
Definition
| surface tape laid under the rib lacing to prevent the lacing from pulling through the fabric |
|
|
Term
| what stitch is used in making a sewn patch repair |
|
Definition
|
|
Term
| what are two types of dope used for aircraft coverings |
|
Definition
| cellulose nitrate and cellulose acetate butyrate |
|
|
Term
| what is the purpose of aluminum pigmented dope |
|
Definition
| to protect the fabric from ultraviolent rays |
|
|
Term
|
Definition
| from condensation on the surface before the dope dries which causes a rough finish |
|
|
Term
|
Definition
| a one step coating that prepares the surface and primes it in one coat. |
|
|
Term
| where is asphalt varnish used |
|
Definition
| around batteries or where water or acid is present |
|
|
Term
| what are some different types of paint used on aircraft |
|
Definition
| lacquer, acrylic lacquer, enamel, polyurethane and epoxy |
|
|
Term
| what are some different types of primer |
|
Definition
| expoxy, wash primer, and zinc chromate |
|
|
Term
| how can paint be applied to aircraft |
|
Definition
| dipping, brushing, or spraying |
|
|
Term
| what causes runs or sags on a painted surface |
|
Definition
| applying paint heavily in one coat |
|
|
Term
| what is the purpose of thinner used with paint |
|
Definition
| to reduce the paint to the desired viscosity |
|
|
Term
| what are some different products that may be used to thin paint |
|
Definition
| butyl alcohal, mineral spirits, toluene, and turpentine |
|
|
Term
| explain the process of stripping paint chemically |
|
Definition
| apply with brush cover with plastic, remove paint by washing and scrubbing |
|
|
Term
| where should aircraft paint materials be stored |
|
Definition
| away from heat sunlight and kept dry |
|
|
Term
| what are three forms of wood used in aircraft construction |
|
Definition
| solid , laminated, and plywood |
|
|
Term
| what are some different defects found in wood |
|
Definition
| knots , pitch pockets, compression damage, shakes, compession wood, decay |
|
|
Term
| what type of glue is used in aircraft wood stuctures |
|
Definition
| casein glues, or resin glues |
|
|
Term
| why is it important to determine the moisture content of a joint before glueing |
|
Definition
|
|
Term
|
Definition
| the two pieces of wood to be joined are beveled |
|
|
Term
| where is plywood used in aircraft construction |
|
Definition
|
|
Term
| list three types of plywood repairs |
|
Definition
| plug patch, scarf patch, and the splayed patch |
|
|
Term
| how are elongated bolt holes in a wood section reparied |
|
Definition
| splicing in a new section and drilling new holes |
|
|
Term
| why is it important to seal a wooden structure |
|
Definition
| to prevent moisture from entering or leaving the wood |
|
|
Term
| what is compression failure of wood |
|
Definition
| buckling the fibers of the wood caused by the wood being over stressed |
|
|
