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9/8/98 AC 43.13-1B SECTION 8. INSPECTION AND REPAIR OF CONTROL CABLES AND TURNBUCKLES 7-140. GENERAL. Aircraft control cables are generally fabricated from carbon steel or corrosion-resistant steel wire of either flexible or nonflexible-type construction. strands of seven wires each. There is no core in this construction. The 3 by 7 cable has a length of lay of not more than eight times or less than five times the nominal cable diame ter. The 7 by 7 cable consists of six strands, of seven wires each, laid around a center strand of seven wires. The wires are laid so as to de velop a cable which has the greatest bending 7-141. CABLE DEFINITIONS. The fol lowing cable components are defined in accor dance with Military Specifications MIL-W-83420, MIL-C-18375, andandwearingproperties.The7by7cablehasa MIL-W-87161. a. Wire Center. The center of all strands shall be an individual wire and shall be desig nated as a wire center. b. Strand Center or Core. A strand cen ter is a single, straight strand made of pre formed wires, similar to the other strands comprising the cable, in arrangement and number of wires. c. Independent Wire Rope Center (IWRC) 7 by 7. A 7 by 7 independent wire rope center as specified herein shall consist of a cable or wire rope of six strands of seven wires each, twisted or laid around a strand center or core consisting of seven wires. 7-142. FLEXIBLE CABLES. Flexible, preformed, carbon steel, Type I, composition A cables, MIL-W-83420, are manufactured from steel made by the acid-open-hearth, basic-open hearth, or electric-furnace process. The wire used is coated with pure tin or zinc. Flexible, preformed, corrosion-resistant, Type I, compo sition B cables, MIL-W-87161, MIL-W-83420, and MIL-C-18375 are manu factured from steel made by the electric- furnace process. (See table 7-3 and fig ure 7-8.) These cables are of the 3 by 7, 7 by 7, 7 by 19, or 6 by 19 IWRC construction, according to the diameter as specified in ta ble 7-3. The 3 by 7 cable consists of three length of lay of not more than eight times or less than six times the cable diameter. The 7 by 19 cable consists of six strands laid around a center strand in a clockwise direction. The wires composing the seven individual strands are laid around a center wire in two layers. The center core strand consists of a lay of six wires laid around the central wire in a clockwise direction and a layer of 12 wires laid around this in a clockwise direction. The six outer strands of the cable consist of a layer of six wires laid around the center wire in a counterclockwise direction and a layer of 12 wires laid around this in a counterclockwise direction. The 6 by 19 cable consists of six strands of 19 wires each, laid around a 7 by 7. MIL-C-18375 cable, although not as strong as MIL-W-83420, is equal in corrosion resistance and superior in non-magnetic and coefficient of thermal expansion properties. 7-143. NYLON-COATED CABLES. a. Nylon-coated cable is made by ex truding a flexible nylon coating over corro sion-resistant steel (CRES) cable. The bare CREScablemustconformandbequalifiedto MIL-W-83420. After coating, the jacketed ca ble must still conform to MIL-W-83420. b. The service life of nylon-coated cable is much greater than the service life of the same cable when used bare. Most cable wear occurs at pulleys where the cable bends. Wear Par 7-140 Page 7-27PDF Image | AFS-640
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