Definition
Small conductive devices, typically slender wicks or rods, fitted to the trailing edges of an aircraft's wings, stabilizers, and other extremities to bleed off the static electrical charge that builds up on the airframe in flight, releasing it harmlessly into the surrounding air.
Plain English
Little pointed conductors attached to the back edges of the wings and tail. As the airplane flies, it picks up static electricity. These wicks let that electricity drain off into the air so it doesn't interfere with the radios and instruments.
Context Anchor
Encountered during preflight inspections, maintenance discussions, and descriptions of aircraft equipment on the trailing edges of wings and tail surfaces.
Derivation
Static' from Latin staticus, meaning 'standing still' — referring to electric charge that accumulates on the airframe rather than flowing as current. 'Wick' comes from the Old English wēoce, the same word used for a candle wick — a slender thing that draws something off. Here, it draws off the standing electrical charge.
Why Pilots Care
Prevents radio static, compass errors, and the risk of spark ignition in fuel vapors during flight through charged air masses.
Grounding Statement
As the airplane moves through the air, it can collect electrical charge, and the static discharge wicks give that charge a safe place to leave.
Intuition Check
Do not read static as meaning the airplane is not moving; here it means built-up electrical charge. Current can also mean electrical flow, but in this term it refers to the wicks now installed or being discussed, not a wind or water current.
Example Sentence 1
During the preflight walk-around, she counted the static discharge wicks on each wing tip and elevator to confirm none were broken or missing.
Example Sentence 2
After flying through clouds, the crew noticed radio noise until the static discharge wicks could equalize the aircraft charge.