Definition
A small wick-like device attached to the trailing edges of an aircraft's control surfaces and wingtips that allows accumulated static electricity to bleed off into the surrounding air at a controlled rate, preventing it from interfering with radio and navigation equipment.
Plain English
A small pointed wick on the back edges of the wings and tail that lets static electricity built up on the airframe leak harmlessly into the air, so it doesn't crackle through the radios or disturb the instruments.
Context Anchor
Seen during preflight inspection on the trailing edges of wings, elevators, rudders, and other outer aircraft surfaces.
Derivation
Static' comes from the Latin 'stare,' meaning 'to stand,' referring to electricity that stays on a surface rather than flowing as current. 'Discharger' means something that releases or unloads. Together: a device that unloads standing electricity.
Why Pilots Care
Uncontrolled static can interfere with radios and navigation equipment and create a spark hazard near fuel vents or sensitive systems.
Analogy
Like a slow leak in a tire that prevents pressure from building to a dangerous level.
Intuition Check
Static does not mean the part is motionless here. It means electrical charge built up on the aircraft; the discharger’s job is to let that charge leave gradually.
Example Sentence 1
During the walk-around, the pilot noticed two static dischargers were missing from the trailing edge of the right aileron and made a note for maintenance.
Example Sentence 2
After flying through rain the radios cleared once the static dischargers bled off the accumulated charge.