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BONDING
Safety wiring methods

Airman - Aviation theories and other practices
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When you perform an inspection, both bonding connections and safetying devices must be inspected with great care. Q5-10. What manual should you consult to find correct replacement wires for a given aircraft? SAFETY METHODS LEARNING OBJECTIVE: Recognize the procedures for the safetying of fasteners and electrical system hardware. Safetying is a process of securing all aircraft bolts, nuts, capscrews, studs, and other fasteners. Safetying prevents the fasteners from working loose due to vibration. Loose bolts, nuts, or screws can ruin engines or cause parts of the aircraft to drop off. To carry out an inspection on an aircraft, you must be familiar with the various methods of safetying. Careless safetying is a sure road to disaster. Always use the proper method for safetying. Always safety a part you have just unsafetied before going on to the next item of inspection. You should always inspect for proper safetying throughout the area in which you are working. There are various methods of safetying aircraft parts. The most widely used methods are safety wire, cotter pins, lock washers, snap rings, and special nuts. Some of these nuts and washers have been described previously in this chapter. SAFETY WIRING Safety wiring is the most positive and satisfactory method of safetying. It is a method of wiring together two or more units. Any tendency of one unit to loosen is counteracted by the tightening of the wire. Nuts, Bolts, and Screws Nuts, bolts, and screws are safety wired by the single-wire double-twist method. This method is the most common method of safety wiring. A single-wire may be used on small screws in close spaces, closed electrical systems, and in places difficult to reach. Figure 5-22 illustrates the following steps required to install a standard double-twist safety wire for two bolts with right-hand threads. 5-15 ANF0522 STEP 1 STEP 2 STEP 3 STEP 4 STEP 5 STEP 6 STEP 7 STEP 8 STEP 9 STEP 10 Figure 5-22.—Standard double-twist safety wire installation procedures.







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