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9/27/01 filiform corrosion—a thread, or filament-like cor rosion which forms on aluminum skins beneath the finish. finish—external coating or covering of an aircraft or part. flat grain—lumber has been sawed parallel with the pith of the log and approximately tangent to the growth rings; that is, the rings form an angle of less than 45 degrees with the surface of the piece. fluorescent—a substance is said to be fluorescent when it will glow or fluoresce when excited by ultra violet light. Some types of dye-penetrant material use fluorescent dyes which are pulled from the cracks by a developer and observed under “black” ultraviolet light. flux—materials used to prevent, dissolve, or facili tate removal of oxides and other undesirable sur face substances. Also, the name for magnetic fields. fretting corrosion—corrosion damage between close-fitting parts which are allowed to rub to gether. The rubbing prevents the formation of pro tective oxide films and allows the metals to cor rode. fuse—a protective device containing a special wire that melts when current exceeds the rated value for a definite period. functional checkthis test may require the use of appropriate test equipment. galvanic corrosion—corrosion due to the pres ence of dissimilar metals in contact with each other. gas cylinder—a portable container used for trans portation and storage of a compressed gas. gas tungsten arc welding—(GTAW) an arc weld ing process which produces coalescence of metals by heating them with an arc between a tungsten (nonconsumable) electrode and the work. Shield ing is obtained from a gas or gas mixture. Pres sure may or may not be used and filler metal may or may not be used. generator—a device for converting mechanical energy into electrical energy. AC 43.13-1B CHG 1 Appendix 1 global positioning system (GPS)a navigation system that employs satellite transmitted signals to determine the aircraft’s location. grain—the direction, size, arrangement, appear ance, or quality of the fibers in wood or metal. grain - diagonal—annual rings in wood at an an gle with the axis of a piece as a result of sawing at an angle with the bark of the tree. grommet—an insulating washer that protects the sides of holes through which wires must pass/or a metal or plastic drain attached to fabric on aircraft. gross weight the total weight of the aircraft including its contents. grounding—the term is usually applied to a par ticular form of bonding that is the process of elec trically connecting conductive objects to either con ductive structure or some other conductive return path for the purpose of safely completing either a normal or fault circuit. harness—a cable harness is a group of cables or wires securely tied as a unit. honeycombmanufactured product consisting of a resin-impregnated sheet or metal material which has been corrugated or expanded into hexagon-shaped and other structural-shaped cells. Primarily used as core material for sandwich constructions. inductance (L)the ability of a coil or conductor to oppose a change in current flow. insulatora material that will not conduct current to an appreciable degree. integrated circuitsmall, complete circuit built up by vacuum deposition and other techniques, usu ally on a silicon chip, and mounted in a suitable package. intergranular corrosion—the formation of corro sion along the grain boundaries within a metal al loy. interlocked-grained wood—wood in which the fi bers are inclined in one direction in a number of rings of annual growth, then gradually reverse and are inclined in an opposite direction in succeeding growth rings, then reverse again. inverter—a device for converting direct current to alternating current. 5PDF Image | AFS-640
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