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9/8/98 AC 43.13-1B Appendix 1 APPENDIX 1. GLOSSARY The following words and terms represent some of those that are often encountered in the field of aviation. For a more complete list of definitions, a mechanic or technician should consult an aviation dictionary. abrasion resistant PTFEa solid insulation wall of PTFE with hard, nonconductive grit positioned mid way in the wall thickness, and significantly improves the resistance of the PTFE material to damage from wear. acetylene—gas composed of two parts of carbon and two parts of hydrogen. When burned in the atmosphere of oxygen, it produces one of the high est flame temperatures obtainable. acetylene regulator—manually adjustable device used to reduce cylinder pressure to torch pressure and to keep the pressure constant. They are never to be used as oxygen regulators. adherend—one of the members being bonded to gether by adhesive. Airworthiness Directivea regulation issued by the FAA that applies to aircraft, aircraft engines, propellers, or appliances, when an unsafe condition exists and that condition is likely to exist or develop in other products of the same type design. airworthy—is when an aircraft or one of its com ponent parts meets its type design and is in a con dition for safe operation. ambient light—the visible light level measured at the surface of the part. ampere (A)the basic unit of current flow. One A is the amount of current that flows when a differ ence of potential of 1 V is applied to a circuit with a resistance of 1 Ω. One coulomb per second. antennaa device designed to radiate or intercept electromagnetic waves. anti-tear strips—strips of fabric of the same mate rial as the airplane is covered with, laid over the wing rib under the reinforcing tape. apparent power—the product of volts and am peres in AC circuits where the current and voltage are out of phase. applianceany instrument, mechanism, equip ment, part, apparatus, appurtenance, or accessory, including communications equipment, that is used or intended to be used in operating or controlling an aircraft in flight, is installed in or attached to the aircraft, and is not part of an airframe, engine or propeller. arma measurement of distance, in inches, feet, etc., used in weight and balance calculations. Normally only the longitudinal arm is of practical importance. The three axial arms are longitudinal arm, lateral arm, and vertical arm. automatic direction finder (ADF)a radio re ceiver utilizing a directional loop antenna that en ables the receiver to indicate the direction from which a radio signal is being received; also called a radio compass. automatic flight control system (AFCS)a flight control system incorporating an automatic pilot with additional systems such as a VOR coupler, an ILS approach coupler, and an internal navigation sys tem that is fully automatic, so the aircraft can be flown in a completely automatic mode. avionicsthe science and technology of electron ics as applied to aviation. azimuthangular distance measured on a hori zontal circle in a clockwise direction from either north or south. balancethe condition of stability which exists in an aircraft when all weight and forces are acting in such a way as to prevent rotation about an axis or pivot point. base metal—the metal to be welded, brazed, sol dered, or cut. black light—electromagnetic radiation in the near ultraviolet range of wavelength. 1PDF Image | AFS-640
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