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STATIC DISCHARGERS
Static dischargers are commonly known as static wicks or 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 (air friction), they limit the potential static buildup on the aircraft and control interference generated by static charge. Static dischargers are not lightning 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 electrical resistance 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 continuous low resistance discharge path between the aircraft and the air. They are attached on some aircraft to the trailing edges of (electrically grounded*) ailerons, elevators, rudder, wing, horizontal and vertical stabilizer tips. On smaller aircraft static dischargers are typically constructed out of glass-reinforced resin surrounding a woven metal conductor. These are fragile and easily damaged by inattentive operators.
A portion of a static discharger on an aircraft. Note the two sharp 3/8" metal micro points and the protective yellow plastic.
A320 wingtip and static discharge wicks
a pair of static discharge wicks
Note: They should be checked on a walk around as they are very susceptible to damage from lightning strikes.