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항공기 정비에서 기초적이면서 가장 중요한 부분이기도 합니다... 다양한 방법의 우리나라 말로 안전결선 영어로는 Safety Wiring이라 불리는 방법을 소개합니다.
가장 중요한 것은 나사가 조여지는 방향에 맞춰서 와이어링 해야합니다.
안배운사람도 당연히 풀리는걸 막기위해서 와이어링 하는거니까 오른쪽방향으로 와이어링 해야하는건 당연하게 생각하지만 일이 바쁘다보면 간혹 실수로 반대방향으로 와이어링 하는 경우가 있습니다.
대체로 왼손잡이 사람이 간혹 실수를 하더군요..ㅎㅎ왼손잡이한테는 왼쪽으로 돌리는게 편해서 그런가...
길이에 맞춰서 와이어를 잘라주어야 하는데 처음에는 와이어를 너무 길게 자르거나 너무 짧게잘라버려서 버려야하는 아주 안타깝고 아까운 상황이 발생합니다.
Step 1. Assemble the unit. Torque the bolts and carefully align the safety wire holes.
Step 2. Insert the proper size wire through the hole in the first bolt.
Step 3. Bend the left end of the wire clockwise around the bolt head and under the other end of the wire.
Step 4. Pull the loop tight against the bolt head. Grasp both ends of the wire. Twist them in a clockwise direction until the end of the braid is just short of the second bolt.
Step 5. Check to ensure that the loop is still tightly in place around the first bolt head. Grasp the wire with pliers just beyond the end of the braid. While holding it taut, twist it in a clockwise direction until the braid is stiff.
NOTE: The braid must be tight enough to resist friction or vibration wear, but should not be overtightened.
Step 6. Insert the upper end of the safety wire through the hole in the second bolt. Pull the braid until it is taut.
Step 7. Bring the other end of the wire counter- clockwise around the bolt head and under the protruding wire end.
Step 8. Tighten the loop and braid the wire ends in a counterclockwise direction. Grasp the wire with the pliers just beyond the end of the braid and twist in a counterclockwise direction until the braid is stiff. Make sure you keep the wire under tension.
Step 9. With a final twisting motion, bend the braid to the right and against the head of the bolt.
Step 10. Cut the braid, being careful that between three and six full twists still remain. Avoid sharp projecting ends.
Figure 5-23 shows various methods commonly used in safety wiring nuts, bolts, and screws. Examples 1, 2, and 5 of figure 5-23 show the proper method of safety wiring bolts, screws, square head plugs, and similar parts when wired in pairs. Examples 6 and 7 show a single-threaded component wired to a housing or lug. Example 3 shows several components wired in series. Example 4 shows the proper method of wiring castellated nuts and studs. Note that there is no loop around the nut. Example 8 shows several components in a closely spaced, closed geometrical pattern, using the single-wire method.
When drilled-head bolts, screws, or other parts are grouped together, they are more conveniently safety wired to each other in a series rather than individually. The number of nuts, bolts, or screws that may be safety wired together depends on the application. For instance, when you are safety wiring widely spaced bolts by the double-twist method, a group of three should be the maximum number in a series.
When you are safety wiring closely spaced bolts, the number that can be safety wired by a 24-inch length of wire is the maximum in a series. The wire is arranged in such a manner that if the bolt or screw begins to loosen, the force applied to the wire is in the tightening direction. 5-16 ANF0523
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