What is the purpose of null field dischargers on aircraft?

The purpose of null field dischargers on aircraft is to dissipate static charges. When an aircraft moves through the atmosphere, it can accumulate static electricity due to friction with air particles, particularly during various phases of flight such as takeoff, landing, and when traveling through precipitation. This buildup of static charge can pose risks, including interference with onboard instruments and electrical systems as well as creating a spark hazard if conditions are right.

Null field dischargers work by providing a path for the accumulated static electricity to safely discharge away from the aircraft into the atmosphere, preventing an excessive buildup. This is crucial for maintaining the proper functioning of critical systems and ensuring the overall safety of flight operations. By alleviating static charges, these devices contribute significantly to the safety and reliability of the aircraft's operation.