Aviation Institute Of Maintenance (AIM) Block 16 Practice Exam

Static discharge wicks provide a controlled path for electrical charges to leave the airplane and enter the surrounding air, which keeps the aircraft from building up excess static electricity. As the aircraft flies, friction with air and precipitation causes static charges to accumulate on the skin. If unmanaged, this can create radio frequency interference and degrade the performance of antennas and navigation equipment. The wicks, usually placed on trailing edges, extend the conductive path to the atmosphere and allow a small corona discharge to occur, gradually bleeding off the charge so radio systems stay cleaner and more reliable. They do not aim to attract lightning or to increase interference; in fact, they help minimize radio disturbance caused by static. They also don’t affect the color of the aircraft skin. Their purpose is specifically to discharge static electricity safely into the air, maintaining better communication and navigation performance during flight.