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AC 43.13-1B CHG 1 Appendix 1 rib—part of primary structure, whose purpose is to maintain profile of airfoil and support fabric or thin wood covering. sacrificial corrosion—a method of corrosion pro tection in which a surface is plated with a metal less noble than itself. Any corrosion will attack the plating rather than the base metal. sandwich constructiona structural panel con cept consisting in its simplest form of two relatively thin, parallel sheets (face sheets) of structural ma terial bonded to and separated by a relatively thick, lightweight core. High strength-to-weight ratios are obtained with sandwiched materials. scarf joint—a joint made by cutting away similar angular segments of two adherents and bonding the adherents with cut areas fitted together. score—a surface tear or break on a surface that has a depth and length ranging between a scratch and a gouge. scratch—a superficial small cut on a surface. semiconductor deviceany device based on ei ther preferred conduction through a solid in one di rection, as in rectifiers; or on a variation in conduc tion characteristics through a partially conductive material, as in a transistor. severe wind and moisture problem (SWAMP) areasareas such as wheel wells, wing folds, and near wing flaps, and areas directly exposed to ex tended weather conditions are considered SWAMP areas on aircraft. silicone rubbera high temperature (200 °C) plas tic insulation that has a substantial silicone content. soldering—a group of welding processes that pro duces coalescence of materials by heating them to the soldering temperature and by using a filler metal having a liquidus not exceeding 450°C (840 °F) and below the solidus of the base metals. The filler metal is distributed between the closely- fitted surfaces of the joint by capillary action. solenoida tubular coil for the production of a magnetic field; electromagnet with a core which is able to move in and out. spar—main spanwise structural member(s) of an aircraft wing or rotorcraft rotor. A wing may have one or two made into a single strong box to which 9/27/01 secondary leading and trailing structures are added. spiral grain—a type of growth in wood which the fibers take a spiral course about the bole of a tree instead of the normal vertical course. The spiral may extend right-handed or left-handed around the tree trunk. statorthe part of an AC generator or motor which contains the stationary winding. stress corrosion—corrosion of the intergranular type that forms within metals subject to tensile stresses which tend to separate the grain bounda ries. surface tape—pinked-edge strips of fabric doped over all seams, rib stitching, and edges of fabric covering (also called finishing tape). switcha device for opening or closing an electri cal circuit. tape—a tape or a “narrow fabric” is loosely defined as a material that ranges in width from 1/4 inch to 12 inches. TCAStraffic alert and collision avoidance system. An airborne system that interrogates mode A, C, and S transponders in nearby aircraft and uses the replies to identify and display potential and pre dicted collision threats. thermocoupledevice to convert heat energy into electrical energy. thermoplastic materiala material that can be re peatedly softened by an increase in the temperature and hardened by a decrease in the temperature with no accompanying chemical change. For example, a puddle of tar on the road in the summer during the heat of day: the tar is soft and fluid; however, when cooler in the evening, it becomes solid again. thermoset materiala material which becomes substantially infusible and insoluble when cured by the application of heat or by chemical means. A ma terial that will undergo, or has undergone, a chemical reaction (different from a thermoplastics physical re action) by the action of heat, catalysts, ultraviolet light, etc. Once the plastic becomes hard, additional heat will not change it back into a liquid as would be the case with a thermoplastic. tip—part of the torch at the end where the gas burns, producing the high-temperature flame. 8PDF Image | AFS-640
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