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9/8/98 AC 43.13-1B c. To prevent failure due to rubbing or vibration, safety wire must be tight after in- stallation. d. Safety wire must be installed in a man- ner that will prevent the tendency of the part to loosen. e. Safety wire must never be over- stressed. Safety wire will break under vibra- tions if twisted too tightly. Safety wire must be pulled taut when being twisted, and main- tain a light tension when secured. (See fig- ure 7-3a.) f. Safety-wire ends must be bent under and inward toward the part to avoid sharp or projecting ends, which might present a safety hazard. g. Safety wire inside a duct or tube must not cross over or obstruct a flow passage when an alternate routing can be used. (1) Check the units to be safety wired to make sure that they have been correctly tor- qued, and that the wiring holes are properly aligned to each other. When there are two or more units, it is desirable that the holes in the units be aligned to each other. Never overtor- que or loosen to obtain proper alignment of the holes. It should be possible to align the wiring holes when the bolts are torqued within the specified limits. Washers may be used (see paragraph 7-37) to establish proper alignment. However, if it is impossible to obtain a proper alignment of the holes without undertorquing or overtorquing, try another bolt which will permit proper alignment within the specified torque limits. (2) To prevent mutilation of the twisted section of wire, when using pliers, grasp the wires at the ends. Safety wire must not be nicked, kinked, or mutilated. Never twist the wire ends off with pliers; and, when cutting off ends, leave at least four to six complete turns (1/2 to 5/8 inch long) after the loop. When removing safety wire, never twist the wire off with pliers. Cut the safety wire close to the hole, exercising caution. h. Install safety wire where practicable with the wire positioned around the head of the bolt, screw, or nut, and twisted in such a man- ner that the loop of the wire fits closely to the contour of the unit being safety wired. 7-125. TWISTING WITH SPECIAL TOOLS. Twist the wire with a wire twister as follows. (See figure 7-4.) CAUTION: When using wire twist- ers, and the wire extends 3 inches be- yond the jaws of the twisters, loosely wrap the wire around the pliers to prevent whipping and possible per- sonal injury. Excessive twisting of the wire will weaken the wire. a. Grip the wire in the jaws of the wire twister and slide the outer sleeve down with your thumb to lock the handles or lock the spring-loaded pin. b. Pull the knob, and the spiral rod spins and twists the wire. c. Squeeze handles together to release wire. 7-126. SECURING OIL CAPS, DRAIN COCKS, AND VALVES. (See figure 7-4a.) When securing oil caps and drain cocks, the safety wire should be anchored to an adjacent fillister-head screw. This method of safety wiring is applied to wingnuts, filler plugs, sin- gle-drilled head bolts, fillister-head screws, etc.; which are safety wired individually. When securing valve handles in the vertical position, the wire is looped around the threads of the pipe leading into one side of the valve, Par 7-124 Page 7-21PDF Image | AFS-640
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