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AC 43.13-1B CHG 1 Appendix 1 dwell time—the total time that a penetrant, emulsi fier (or remover), or developer remains on the sur face of the test part. dye penetrant inspection—an inspection method for surface cracks in which a penetrating dye is al lowed to enter any cracks present and is pulled out of the crack by an absorbent developer. A crack appears as a line on the surface of the developer. edge grain—edge-grain lumber has been sawed parallel with the pith of the log and approximately at right angles to the growth rings; that is, the rings form an angle of 45 degrees or more with the sur face of the piece. electricity—one of the fundamental quantities in nature consisting of elementary particles, electrons and protons, which are manifested as a force of at traction or repulsion, and also in work that can be performed when electrons are caused to move; a material agency which, when in motion, exhibits magnetic, chemical, and thermal effects, and when at rest is accompanied by an interplay of forces be tween associated localities in which it is present. electromagnet—temporary magnet which is mag netized by sending current through a coil of wire wound around an iron core. Electromagnetic/Radio Frequency Interference (EMI/RFI)—frequency spectrum of electromagnetic radiation extending from subsonic frequency to X-rays. This term should not be used in place of the term Radio Frequency Interference (RFI). (See radio frequency interference.) Shielding materials for the entire EMI spectrum are not readily avail able. electromotive force (EMF)—difference of electri cal potential measured in volts. electron—a negative charge that revolves around the nucleus of an atom; a unit of a negative electri cal charge. electronics—general term that describes the branch of electrical science and technology that treats the behavior and effects of electron emission and transmission. electron Volt (eV)—a unit of energy equal to the energy aquired by an electron falling though poten tial differences of one volt, approximately 1.602X 10-19 joule. 9/27/01 emulsion-type cleaner—a chemical cleaner which mixes with water or petroleum solvent to form an emulsion (a mixture which will separate if allowed to stand). It is used to loosen dirt, soot, or oxide films from the surface of an aircraft. epoxy—one of various usually thermosetting res ins capable of forming tight cross-linked polymer structures marked by toughness, strong adhesion, high corrosion, and chemical resistance, used es pecially in adhesives and surface coating. epoxy primer—a two-part catalyzed material used to provide a good bond between a surface and a surface coating. epoxy resin—a common thermosetting resin which exhibits exceptionally good adhesion, low cure shrinkage, and low water-absorption proper ties. erosion—loss of metal from metal surfaces by the action of small particles such as sand or water. ETFE(Frequently referred to by the trade name, TEFZEL) a copolymer of PTFE and polyethylene. exciter—small generator for supplying direct cur rent to the alternator’s field windings. exfoliation corrosion—a form of intergranular corrosion that attacks extruded metals along their layer-like grain structure. expandable sleeving—open-weave braided sleeving used to protect wire and cables from abrasion and other hazards (commonly known by trade name EXPANDO). FEP—fluorinated ethylene propylene (commonly known by the trade name, TEFLON). A melt ex trudable fluorocarbon resin, very similar in appear ance and performance to PTFE, but with a maxi mum temperature rating of 200 °C. ferrous metal—iron, or any alloy containing iron. fiberglassthe most common material used to re inforce structures in home-built and experimental aircraft. Available as mat, roving, fabric, etc. It is in corporated into both thermoset and thermoplastic resins. The glass fibers increase mechanical strength, impact resistance, stiffness, and dimen sional stability of the matrix. fillthreads in a fabric that run crosswise of the woven material. 4PDF Image | AFS-640
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