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9/8/98 AC 43.13-1B 11-122. MOISTURE PROTECTION, WHEEL WELLS, AND LANDING GEAR AREAS. a. Wires located on landing gear and in the wheel well area can be exposed to many hazardous conditions if not suitably protected. Where wire bundles pass flex points, there must not be any strain on attachments or ex- cessive slack when parts are fully extended or retracted. The wiring and protective tubing must be inspected frequently and replaced at the first sign of wear. b. Wires should be routed so that fluids drain away from the connectors. When this is not practicable, connectors must be potted. Wiring which must be routed in wheel wells or other external areas must be given extra pro- tection in the form of harness jacketing and connector strain relief. Conduits or flexible sleeving used to protect wiring must be equipped with drain holes to prevent entrap- ment of moisture. 11-123. PROTECTION AGAINST PER- SONNEL AND CARGO. Wiring must be in- stalled so the structure affords protection against its use as a handhold and damage from cargo. Where the structure does not afford adequate protection, conduit must be used, or a suitable mechanical guard must be provided. 11-124. HEAT PRECAUTIONS. Wiring must be routed away from high-temperature equipment and lines to prevent deterioration of insulation. Wires must be rated (reference paragraph 11-66 and 11-67) so that the con- ductor temperature remains within the wire specification maximum when the ambient temperature, and heat rise, related to current carrying capacity are taken into account. The residual heating effects caused by exposure to sunlight when aircraft are parked for extended periods should also be taken into account. Wires such as in fire detection, fire extin- guishing, fuel shutoff, and fly-by-wire flight control systems that must operate during and after a fire, must be selected from types that are qualified to provide circuit integrity after exposure to fire for a specified period. Wire insulation deteriorates rapidly when subjected to high temperatures. Do not use wire with soft polyethylene insulation in areas subject to high temperatures. Use only wires or cables with heat resistance shielding or insulation. 11-125. MOVABLE CONTROLS WIR- ING PRECAUTIONS. Clamping of wires routed near movable flight controls must be attached with steel hardware and must be spaced so that failure of a single attachment point can not result in interference with con- trols. The minimum separation between wir- ing and movable controls must be at least 1/2 inch when the bundle is displaced by light hand pressure in the direction of the controls. 11-126. FLAMMABLE FLUIDS AND GASES. An arcing fault between an electrical wire and a metallic flammable fluid line may puncture the line and result in a fire. Every ef- fort must be made to avoid this hazard by physical separation of the wire from lines and equipment containing oxygen, oil, fuel, hy- draulic fluid, or alcohol. Wiring must be routed above these lines and equipment with a minimum separation of 6 inches or more whenever possible. When such an arrange- ment is not practicable, wiring must be routed so that it does not run parallel to the fluid lines. A minimum of 2 inches must be main- tained between wiring and such lines and equipment, except when the wiring is posi- tively clamped to maintain at least 1/2-inch separation, or when it must be connected Par 11-115 Page 11-53PDF Image | AFS-640
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