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9/27/01 AC 43.13-1B CHG 1 verse direction in a bundle. Where the wire is suitably supported, the radius may be 3 times the diameter of the wire or cable. Where it is not practical to install wiring or cables within the radius requirements, the bend should be enclosed in insulating tubing. The radius for thermocouple wire should be done in accor- dance with the manufacturer’s recommenda- tion and shall be sufficient to avoid excess losses or damage to the cable. bb. Ensure that RF cables, e.g., coaxial and triaxial are bent at a radius of no less than 6 times the outside diameter of the cable. cc. Ensure that wires and cables, that are attached to assemblies where relative movement occurs (such as at hinges and ro- tating pieces; particularly doors, control sticks, control wheels, columns, and flight control surfaces), are installed or protected in such a manner as to prevent deterioration of the wires and cables caused by the relative movement of the assembled parts. dd. Ensure that wires and electrical ca- bles are separated from mechanical control ca- bles. In no instance should wire be able to come closer than 1/2 inch to such controls when light hand pressure is applied to wires or controls. In cases where clearance is less than this, adequate support must be provided to prevent chafing. ee. Ensure that wires and cables are provided with enough slack to meet the fol- lowing requirements: (1) Permit ease of maintenance. (2) Prevent mechanical strain on the wires, cables, junctions, and supports. (3) Permit free movement of shock and vibration mounted equipment. (4) Allow shifting of equipment, as necessary, to perform alignment, servicing, tuning, removal of dust covers, and changing of internal components while installed in air- craft. ff. Ensure that unused wires are indi- vidually dead-ended, tied into a bundle, and secured to a permanent structure. Each wire should have strands cut even with the insula- tion and a pre-insulated closed end connector or a 1-inch piece of insulating tubing placed over the wire with its end folded back and tied. gg. Ensure that all wires and cables are identified properly at intervals of not more than 15 inches. Coaxial cables are identified at both equipment ends. 11-97. WIRING REPLACEMENT. Wir- ing must be replaced with equivalent wire (see paragraph 11-78) when found to have any of the following defects: a. Wiring that has been subjected to chafing or fraying, that has been severely dam- aged, or that primary insulation is suspected of being penetrated. b. Wiring on which the outer insulation is brittle to the point that slight flexing causes it to crack. c. Wiring having weather-cracked outer insulation. d. Wiring that is known to have been ex- posed to electrolyte or on which the insulation appears to be, or is suspected of being, in an initial stage of deterioration due to the effects ofelectrolyte. Par 11-96 Page 11-45PDF Image | AFS-640
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