Continued Electromagnetic Protection of Aircraft and Systems 2001-01-2889

Aircraft electromagnetic protection has always been focused on the design, test and analysis required for certifying aircraft. That focus is now expanding to include the continued airworthiness of electromagnetic protection over the entire life of the aircraft. A better understanding of the scope and magnitude of maintaining assurance is needed for continued electromagnetic protection and safety over the lifetime of the aircraft.

Wire bundle shielding of aircraft wiring harnesses, electrical bonding, and grounding are all used to provide electromagnetic protection in general aviation aircraft. The effectiveness of these protection methods is assumed to be maintained using periodic detailed visual inspections and DC bond checks after any replacements or repairs. This assumption appears valid because of the low number of catastrophic occurrences involving lightning strikes. However, the continued effectiveness of electromagnetic protection methods becomes more important as the use of and complexity of the Avionics used in the aircraft increases. Continued effectiveness of the electromagnetic protection methods is also very important as the amount of composite materials used in the manufacture of the aircraft is increased.