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9/8/98 AC 43.13-1B SECTION 12. WIRE INSULATION AND LACING STRING TIE 11-155. GENERAL. Insulation of wires should be appropriately chosen in accordance with the environmental characteristics of wire routing areas. Routing of wires with dissimilar insulation, within the same bundle, is not rec- ommended, particularly when relative motion and abrasion between wires having dissimilar insulation can occur. Soft insulating tubing (spaghetti) cannot be considered as mechanical protection against external abrasion of wire; since at best, it provides only a delaying ac- tion. Conduit or ducting should be used when mechanical protection is needed. 11-156. INSULATION MATERIALS. In- sulating materials should be selected for the best combination of characteristics in the fol- lowing categories: m. Special properties unique to the aircraft. n. For a more complete selection of in- sulated wires refer to SAE AS 4372 Aerospace Wire Performance Requirement and SAE AS 4373 Test Methods for Aerospace Wire. 11-157. STRIPPING INSULATION. Attachment of wire, to connectors or termi- nals, requires the removal of insulation to ex- pose the conductors. This practice is com- monly known as stripping. Stripping may be accomplished in many ways; however, the following basic principles should be practiced. a. Make sure all cutting tools used for stripping are sharp. b. When using special wire stripping tools, adjust the tool to avoid nicking, cutting, or otherwise damaging the strands. c. Damage to wires should not exceed the limits specified in table 11-13. d. When performing the stripping op- eration, remove no more insulation than is necessary. 11-158. LACING AND TIES. Ties, lacing, and straps are used to secure wire groups or bundles to provide ease of maintenance, in- spection, and installation. Braided lacing tape per MIL-T-43435 is suitable for lacing and tying wires. In lieu of applying ties, straps meeting Specification MS17821 or MS17822 may be used in areas where the temperature does not exceed 120 �C. Straps may not be used in areas of SWAMP such as wheel wells, near wing flaps or wing folds. They may not be used in high vibration areas, where failure a. b. c. d. e. f. g. h. i. j. k. l. Abrasion resistance. Arc resistance (noncarbon tracking). Corrosion resistance. Cut-through strength. Dielectric strength. Flame resistance. Heat distortion temperature. Impact strength. Mechanical strength. Resistance to fluids. Resistance to notch propagation. Smoke emission. Par 11-155 Page 11-61PDF Image | AFS-640
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