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AC 43.13-1B CHG 1 9/27/01 n. Ensure cable supports do not restrict the wires or cables in such a manner as to in- terfere with operation of equipment shock mounts. o. Do not use tape, tie straps, or cord for primary support. p. Make sure that drain holes are pres- ent in drip loops or in the lowest portion of tubing placed over the wiring. q. Ensure that wires and cables are routed in such a manner that chafing will not occur against the airframe or other compo- nents. r. Ensure that wires and cables are po- sitioned in such a manner that they are not likely to be used as handholds or as support for personal belongings and equipment. s. Ensure that wires and cables are routed, insofar as practicable, so that they are not exposed to damage by personnel moving within the aircraft. t. Ensure that wires and cables are lo- cated so as not to be susceptible to damage by the storage or shifting of cargo. u. Ensure that wires and cables are routed so that there is not a possibility of dam- age from battery electrolytes or other corrosive fluids. v. Ensure that wires and cables are ade- quately protected in wheel wells and other ar- eas where they may be exposed to damage from impact of rocks, ice, mud, etc. (If re- routing of wires or cables is not practical, pro- tective jacketing may be installed). This type of installation must be held to a minimum. w. Where practical, route electrical wires and cables above fluid lines and provide a 6 inch separation from any flammable liquid, fuel, or oxygen line, fuel tank wall, or other low voltage wiring that enters a fuel tank and requires electrical isolation to prevent an igni- tion hazard. Where 6 inch spacing cannot practically be provided, a minimum of 2 inches must be maintained between wiring and such lines, related equipment, fuel tank walls and low voltage wiring that enters a fuel tank. Such wiring should be closely clamped and rigidly supported and tied at intervals such that contact betwe4en such lines, related equip- ment, fuel tank walls or other wires, would not occur, assuming a broken wire and a missing wire tie or clamp. x. Ensure that a trap or drip loop is provided to prevent fluids or condensed mois- ture from running into wires and cables dressed downward to a connector, terminal block, panel, or junction box. y. Wires and cables installed in bilges and other locations where fluids may be trapped are routed as far from the lowest point as possible or otherwise provided with a moisture-proof covering. z. Separate wires from high-temperature equipment, such as resistors, exhaust stacks, heating ducts, etc., to prevent insulation break- down. Insulate wires that must run through hot areas with a high-temperature insulation material such as fiberglass or PTFE. Avoid high-temperature areas when using cables having soft plastic insulation such as polyeth- ylene, because these materials are subject to deterioration and deformation at elevated tem- peratures. Many coaxial cables have this type of insulation. aa. The minimum radius of bends in wire groups or bundles must not be less than 10 times the outside diameter of the largest wire or cable, except that at the terminal strips where wires break out at terminations or re- Page 11-44 Par 11-96PDF Image | AFS-640
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