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AC 43.13-1B CHG 1 9/27/01 f. Nylon-jacketed cable with any cracks or necking down in the diameter of the jacket shall be replaced. Usable cable life is over when these conditions begin to appear in the nylon jacket. g. External wear patterns will extend along the cable equal to the distance the cable moves at that location and may occur on one side of the cable or on its entire circumference. Replace flexible and nonflexible cables when the individual wires in each strand appear to blend together (outer wires worn 40 to 50 per cent) as depicted in figure 7-17. Actual in stances of cable wear beyond the recom mended replacement point are shown in fig ure 7-18. FIGURE 7-17. Cable wear patterns. h. As wear is taking place on the exterior surface of a cable, the same condition is taking place internally, particularly in the sections of the cable which pass over pulleys and quad rants. This condition (shown in figure 7-19) is not easily detected unless the strands of the ca ble are separated. This type of wear is a result of the relative motion between inner wire sur faces. Under certain conditions, the rate of this type of wear can be greater than that occurring on the surface. FIGURE 7-18. Worn cable (replacement necessary). i. Areas especially conducive to cable corrosion are battery compartments, lavatories, wheel wells, etc.; where a concentration of corrosive fumes, vapors, and liquids can ac cumulate. Carefully examine any cable for corrosion, when it has a broken wire in a sec tion that is not in contact with a wear- producing airframe component, such as a pul ley, fair-lead, etc. If the surface of the cable is corroded, relieve cable tension and carefully force the cable open by reverse twisting and visually inspect the interior. Corrosion on the interior strands of the cable constitutes failure, and the cable must be replaced. If no internal corrosion is detected, remove loose external rust and corrosion with a clean, dry, coarse- weave rag, or fiber brush. Do not use metallic Page 7-36 Par 7-149PDF Image | AFS-640
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