FAA Aviation Mechanic Airframe (AMA)Airframe StructuresMedium
A technician conducting a walk-around inspection notices that the static dischargers (static wicks) are missing from the trailing edges of the ailerons and rudder. What is the primary operational hazard created by this discrepancy?
- ABuildup of static electric charge on the airframe causing radio/navigation interference and possible discharge damage
- BIncreased fuel consumption due to added aerodynamic drag
- CReduced hydraulic pressure to the flight control actuators
- DLoss of control surface mass balance, leading to flutter
Show answer & explanationAnswer & explanation
Correct answer: A. Buildup of static electric charge on the airframe causing radio/navigation interference and possible discharge damage
Static dischargers provide a low-resistance path for static electricity, built up from precipitation and airflow friction, to dissipate off the aircraft in a controlled manner. Without them, static buildup can cause noisy radio communications, navigation errors, and even discharge sparks (corona/streamers) at trailing edges.
Why the other options are wrong
- B. Static wicks have negligible effect on drag or fuel burn compared to their electrical function.
- C. Hydraulic pressure is unaffected by static dischargers.
- D. Static wicks are unrelated to control surface mass balance.
Static Dischargers (Static Wicks)
Small conductive rods mounted at trailing edges of wings and control surfaces to safely discharge static electricity buildup from the airframe.
- Provide a path for precipitation static to exit the airframe smoothly
- Missing wicks cause radio static and navigation interference
- Bonding straps and static wicks work together for electrical continuity
Memory trick: Static wicks are lightning rods that quietly bleed off the charge