Static dischargers are commonly known as static wicks static discharge wicks. They are used on aircraft to allow the continuous satisfactory operation of onboard navigation and radio communication systems. During adverse charging conditions, they limit the potential static buildup on the aircraft and control interference generated by static charge. Static dischargers are not lighting arrestors and do not reduce or increase the likelihood of an aircraft being struck by lightning. Static dischargers are subject to damage or significant changes in resistance characteristics as a result of lightning strike to the aircraft, and should be inspected after a lightning strike to ensure proper static discharge operation. Static dischargers are fabricated with a wick of wire or a conductive element on one end, which provides a high resistance discharge path between the aircraft and the air. See figure 2-56. They are attached on some aircraft to the ailerons, elevators, rudder, wing, horizontal and vertical stabilizer tips, etc. Refer to your applicable aircraft’s MIM for maintenance procedures.

Figure 2-56.—Typical static dischargers.

Learning Objective: Identify the various safety methods used on aircraft hardware. 

You will come in contact with many different types of safetying materials. These materials are used to stop rotation and other movement of fasteners. They are also used to secure other equipment that may come loose due to vibration in the aircraft.

Cotter pins are used to secure bolts, screws, nuts, and pins. Some cotter pins are made of low-carbon steel, while others consist of stainless steel and are more resistant to corrosion. Also, stainless steel cotter pins may be used in locations where nonmagnetic material is required. Regardless of shape or material, all cotter pins are used for the same general purpose—safetying. Figure 2-57 shows three types of cotter pins and how their size is determined.

NOTE: Whenever uneven prong cotter pins are used, the length measurement is to the end of the shortest prong.

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