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9/27/01 AC 43.13-1B CHG 1 aerospace applications in open and protected wiring applications. These wires could poten tially be used for substitution when approved by the OAM. b. Areas designated as severe wind and moisture problem (SWAMP) areas differ from aircraft to aircraft but generally are con sidered to be areas such as wheel wells, near wing flaps, wing folds, pylons, and other exte rior areas that may have a harsh environment. Wires for these applications often have design features incorporated into their construction that may make the wire unique; therefore an acceptable substitution may be difficult, if not impossible, to find. It is very important to use the wire type recommended in the aircraft manufacturer’s maintenance handbook. c. The use of current military specifica- tion, multi-conductor cables in place of OEM installed constructions may create problems such as color sequence. Some civil ian aircraft are wired with the older color se quence employing “Red-Blue-Yellow” as the first three colors. Current military specifica tion, multi-conductor cables, in accordance with MIL-C-27500, use “White-Blue-Orange” for the initial three colors. Use of an alterna tive color code during modification without adequate notation on wiring diagrams could severely complicate subsequent servicing of the aircraft. At the time of this writing, MIL-C-27500 is being revised to include the older color sequence and could eliminate this problem in the future. 11-79.11-84. [RESERVED.] Table 11-2b. Comparable properties of wire insulation systems. Most desirable � Least Relative Ranking Weight Temperature Abrasion resistance Cut-through resistance Chemical resistance Flammability Smoke generation Flexibility Creep (at temperature) Arc propagation resistance 1 2 PI ETFE PTFE COMP PI ETFE PI COMP PTFE ETFE PTFE COMP PI COMP PTFE ETFE PI COMP PTFE ETFE 3 4 COMP PTFE PI ETFE COMP PTFE ETFE PTFE COMP PI PI ETFE PTFE ETFE COMP PI PTFE ETFE COMP PI Par 11-78 Page 11-37 (and 11-38)PDF Image | AFS-640
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