How is the risk of tribocharging (static electricity generation) by the propeller managed on an airplane? Regardless of airplane size, it seems the rotation of the propeller or engine blades could cause tribocharging somewhere in the electrical system, and that charge would have to be grounded or dissipated somehow.
While these might not be specifically for static from the prop, static dischargers help bleed charge away from the aircraft. Static definitely does build up on an airframe, requiring grounding (electrically) your plane before fueling.
Infinitesimal risk, Faraday field (added copper coating for insulant composite material modern airplanes) protect, and devices such as these dissipate static electricity.