What is the primary function of static wicks on aircraft?

• A. To reduce drag.
• B. To protect against lightning.
• C. To increase lift.
• D. To dissipate static electricity and reduce radio interference, improving communication and navigation accuracy.

Answer: (D)

Static wicks provide a path for accumulated static electricity on the aircraft to bleed off into the atmosphere. As air flows over the airframe, surfaces collect static charges; if these charges aren’t released, they create radio‑frequency noise that can interfere with communications and navigation equipment. The wicks discharge the charge gradually, reducing RF interference and helping maintain clear communications and accurate navigation signals. They’re placed on trailing edges to maximize discharge effectiveness. They’re not meant to reduce drag or increase lift, and while they interact with lightning protection, their primary function is static discharge to keep avionics clean and reliable.