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9/27/01 pitch distribution—is the gradual twist in the pro peller blade from shank to tip. pitted—small irregular shaped cavities in the sur face of the parent material usually caused by cor rosion, chipping, or heavy electrical discharge. pitting—the formation of pockets of corrosion products on the surface of a metal. plastican organic substance of large molecular weight which is solid in its finished state and, at some stage during its manufacture or its processing into a finished article, can be shaped by flow. polyester braida plastic braiding thread, when used as the outer surface of a wire, provides a cloth- like appearance. polyimide tapea plastic film (commonly referred to by the trade name, KAPTON). The tape has a dark brown color, and is frequently coated with a polyimide varnish that has a very distinct mustard yellow color. At times, the spiral edge of the outer most tape is apparent under the varnish topcoat. It may be used for wire insulation. Total polyimide tape insulated wire constructions are inactive for new de sign on military aircraft and are subject to the proce dures defined in FAA Advisory Circular AC 29-2A Change 2 Paragraph 29.1359 in Civil Aircraft. polyimide varnisha liquid form of polyimide that is applied to the outer surface of a wire through the process of repeated dipping through the varnish bath with subsequent heat curing. The successive layers rarely reach a total buildup of 1 mil. polymerization—basic processes for making large (high-polymer) molecules from small ones, nor mally without chemical change; can be by addition, condensation, rearrangement, or other methods. porosity—cavity-type discontinuities in metal formed by gas entrapment during solidification. prepreg—a mat, a fabric, or covering impregnated with resin that is ready for lay up and curing. propeller—is a rotating airfoil that consists of two or more blades attached to a central hub which is mounted on the engine crankshaft. protractor—is a device for measuring angles. PTFE Tape (Insulation)polytetrafluoroethylene tape (commonly known by the trade name, TEF- LON), wrapped around a conductor and then cen- AC 43.13-1B CHG 1 Appendix 1 tered with heat, fusing the layers into a virtually ho mogeneous mass. It is used both as a primary insu lation against the conductor, and as an outer layer or jacket over a shield. Maximum temperature rating is 260 °C. PVF2 Polyvinylidine Fluoridea fluorocarbon plastic, that when used in aircraft wire, is invariably radiation cross-linked and employed as the outer layer. radar (radio detecting and ranging)radio equipment that utilizes reflected pulse signals to lo cate and determine the distance to any reflecting object within its range. radomea nonmetallic cover used to protect the antenna assembly of a radar system. rectifier—a device for converting alternating cur rent to direct current. reinforcing tape—a narrow woven cotton or poly ester tape used over aircraft fabric to reinforce it at the stitching attachments. relayan electrically-operated remote-control switch. resin—vast profusion of natural and increasingly, synthetic materials used as adhesives, fillers, bind ers and for insulation. resistancethe opposition a device or material of fers to the flow or current. resonance method (ringing) of ultrasonic in- spection—a method of detecting material thick ness or indications of internal damage by injecting variable frequency ultrasonic energy into a mate rial. A specific frequency of energy will produce the clearest indication of damage in a given thickness of material. When the equipment is calibrated for a specific thickness, and this thickness changes, an aural or visual alert is given. resonant frequency—the frequency of a source of vibration that is exactly the same as the natural vibration frequency of the structure. resonate—a mechanical system is said to reso nate when its natural vibration frequency is exactly the same as the frequency of the force applied. When an object resonates at a particular fre quency, the amplitude in its vibration will increase immensely as that frequency is reached and will be less on either side of that frequency. 7PDF Image | AFS-640
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