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WIRE ROPE
AIRCRAFT JACKING

Aviation Structural Mechanic (H&S) 3&2 - How airplanes are built and how to maintain them
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Figure 3-25.—Cable lay length. cross section. Figure 3-24 shows the proper method of measuring the diameter of a wire rope. 2. Lay Length. The distance, parallel to the axis of the cable, in which a strand makes one complete turn about that axis is known as the lay length or pitch length. Figure 3-25 shows the lay length of a wire rope. Wire rope cables are visually inspected for knots, fraying, stretching, abrasions, severe corrosion, and other signs of failure. Of particular importance is the detection of a cable in which a kink has been pulled through in order to straighten the cable. The resultant deformation is known as a bird cage. See figure 3-26. In such a case, the sling should be discarded. The presence of one or more broken wires in one rope lay length or one or more broken wires near an attached fitting is cause for replacement. If a broken wire is the result of corrosion or if the cable is excessively Figure 3-26.—Cable damage resulting from a pulled-through corroded, the cable must not be used regardless of the kink. 3-36 Figure 3-24.—Measuring the diameter of a wire rope.







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