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AFS-640

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AFS-640 ( afs-640 )

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AC 43.13-1B CHG 1 Appendix 1 blade station—is a reference position on a blade that is a specified distance from the center of the hub. bond—the adhesion of one surface to another, with or without the use of an adhesive as a bonding agent. bonding—a general term applied to the process of electrically connecting two or more conductive ob­ jects. In aircraft, the purpose of bonding (except as applied to individual connections in the wiring and grounding systems) is to provide conductive paths for electric currents. This is accomplished by pro­ viding suitable low-impedance connections joining conductive aircraft components and the aircraft structure. Another purpose of bonding is to ensure the safe passage of current caused by lightning or static electricity through the aircraft structure. borescope—a long, tubular optical instrument de­ signed for remote visual inspection of surfaces. brashness—a condition of wood characterized by low resistance to shock and by an abrupt failure across the grain without splintering. braze welding—a welding process variation in which a filler metal, having a liquidus above 450 °C (840 °F) and below the solidus of the base metal is used. Unlike brazing, in braze welding the filler metal is not distributed in the joint by capillary ac­ tion. brazing—the joining of two pieces of metal by wet­ ting their surface with molten alloy of copper, zinc, or tin. bus or bus bar—solid copper strips to carry cur­ rent between primary and secondary circuits; also used as jumpers. butt joint—a joint between two members aligned approximately in the same plane. butyrate dope—a finish for aircraft fabric consist­ ing of a film base of cellulose fibers dissolved in solvents with the necessary plasticizers, solvent, and thinners. cable—(electrical)assembly of one or more con­ ductors within an enveloping protective sheath so constructed as to permit use of conductors sepa­ rately or in a group. calibrationa set of operations, performed in ac­ cordance with a definite document procedure, which compares the measurements performed by 9/27/01 an instrument or standard, for the purpose of de­ tecting and reporting, or eliminating by adjustment, errors in the instrument tested. center of gravitythat point about which the air­ craft would balance if suspended. For field weight and balance purposes/control, the center of gravity is normally calculated only along its longitudinal axis (nose to tail), disregarding both the lateral and vertical location. certification—implies that a certificate is in exis­ tence which certifies or states a qualification. check—a lengthwise separation of the wood, the greater part of which occurs across the rings of an­ nual growth. chemical conversion coating (Specification MIL-C-81706)—is a chemical surface treatment used on aluminum alloys to inhibit corrosion and to provide a proper surface for paint finishing. chordan imaginary straight line joining the leading and trailing edges of an airfoil. circuit—a closed path or mesh of closed paths usually including a source of EMF. circuit breakera protective device for opening a circuit automatically when excessive current is flowing through it. close-grained wood—wood with narrow and in­ conspicuous annual rings. The term is sometimes used to designate wood having small and closely- spaced pores, but in this sense the term “fine­ textured” is more often used. coil shot—production of longitudinal magnetization accomplished by passing current through a coil en­ circling the part being inspected. compassa device used to determine direction on the Earth’s surface. A magnetic compass util­ izes the Earth’s magnetic field to establish direc­ tion. compression wood—identified by its relatively wide annual rings, usually eccentric, and its rela­ tively large amount of summer wood, usually more than 50 percent of the width of the annual rings in which it occurs. Compression wood shrinks ex­ cessively lengthwise as compared with normal wood. 2

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