Definition
A method of dissipating the static electrical charge that builds up on an aircraft in flight by allowing it to discharge harmlessly into the surrounding air through static dischargers (small wicks or rods mounted on the trailing edges of control surfaces and wingtips). As the aircraft moves through the air, friction with precipitation, dust, and atmospheric particles causes a buildup of static charge on the airframe; the dischargers provide sharp points from which this charge can leak off into the air at a low, controlled rate, preventing it from interfering with radio reception.
Plain English
An aircraft picks up static electricity as it flies, much like you pick up a charge walking across a carpet. Small pointed wicks fitted to the wings and tail let that charge slowly leak away into the air so it does not build up and disrupt the radios.
Context Anchor
Seen in discussions of static dischargers, radio interference, and aircraft electrical charge buildup during flight.
Derivation
Static comes from a Greek word meaning standing or stationary. In this use, static electricity is electrical charge that has built up on the aircraft instead of flowing normally. Into the air points to where that charge is released: the surrounding atmosphere, not the ground.
Why Pilots Care
Uncontrolled discharge can create sparks capable of igniting fuel vapors, creating a serious fire hazard on the ground.
Analogy
It is like touching a doorknob after walking across carpet, except the aircraft uses small discharge points to bleed the charge away gradually instead of letting it build up for one sudden spark.
Grounding Statement
As an aircraft moves through rain, snow, dust, or dry air, electrical charge can build on its surface and then be released into the air through designed discharge points.
Intuition Check
Do not picture the airplane dumping a large dangerous electrical current into the sky. In this context, it means a small, controlled bleed-off of built-up charge into the surrounding air.
Example Sentence 1
During preflight, the pilot checked each static wick on the trailing edges of the ailerons and rudder to ensure the aircraft could discharge static electricity into the air.
Example Sentence 2
After landing through dry air, the aircraft dissipated its static electricity into the air via the static wicks before refueling began.