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9/27/01 AC 43.13-1B CHG 1 SECTION 7. TABLE OF ACCEPTABLE WIRES 11-85. AIRCRAFT WIRE TABLE. Ta- bles 11-11 and 11-12 list wires used for the transmission of signal and power currents in aircraft. It does not include special purpose wires such as thermocouple, engine vibration monitor wire, fiber optics, data bus, and other such wire designs. Fire resistant wire is in- cluded because it is experiencing a wider ap- plication in aircraft circuits beyond that of the fire detection systems. a. All wires in tables11-11 and 11-12 have been determined to meet the flammability requirements of Title 14 of the Code of Federal Regulation (14 CFR) part 25, section 25.869(a)(4) and the applicable portion of part 1 of Appendix F of part 25. b. The absence of any wire from ta- bles 11-11 and 11-12 are not to be construed as being unacceptable for use in aircraft. How- ever, the listed wires have all been reviewed for such use and have been found suitable, or have a successful history of such usage. c. Explanations of the various insulation materials mentioned in table 11-11, by abbre- viations, can be found in the glossary. 11-86. OPEN AIRFRAME INTERCON- NECTING WIRE. Interconnecting wire is used in point to point open harnesses, normally in the interior or pressurized fuselage, with each wire providing enough insulation to resist damage from handling and service exposure. (See table 11-11.) Electrical wiring is often in- stalled in aircraft without special enclosing means. This practice is known as open wiring and offers the advantages of ease of mainte- nance and reduced weight. 11-87. PROTECTED WIRE. Airborne wire that is used within equipment boxes, or has additional protection, such as an exterior jacket, conduit, tray, or other covering is known as protected wire. (See table 11-12.) 11-88. SEVERE WIND AND MOISTURE PROBLEMS (SWAMP). Areas such as wheel wells, wing fold and pylons, flap areas, and those areas exposed to extended weather shall dictate selection and will require special consideration. Insulation or jacketing will vary according to the environment. Suitable wire types selected from MIL-W-22759 shall be used in these applications. (See table 11-11.) Suitable wire types selected from MIL-W-22759 are preferred for areas that re- quire repeated bending and flexing of the wire. Consideration should be made to areas that re- quire frequent component removal or repair. (See table 11-11.) 11-89. SHIELDED WIRE. With the in- crease in number of highly sensitive electronic devices found on modern aircraft, it has be- come very important to ensure proper shield- ing for many electric circuits. Shielding is the process of applying a metallic covering to wiring and equipment to eliminate interference caused by stray electromagnetic energy. Shielded wire or cable is typically connected to the aircraft’s ground at both ends of the wire, or at connectors in the cable. Electromagnetic Interference (EMI) is caused when electro- magnetic fields (radio waves) induce high- frequency (HF) voltages in a wire or compo- nent. The induced voltage can cause system inaccuracies or even failure, therefore putting the aircraft and passengers at risk. Shielding helps to eliminate EMI by protecting the pri- mary conductor with an outer conductor. Re- fer to MIL-DTL-27500, Cable, Power, Electri- cal and Cable Special Purpose, Electrical Shielded and Unshielded General Specifica- tions. Par 11-85 Pages 11-39PDF Image | AFS-640
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