Safeguarding aircraft systems

How several systems suppliers, airframers, and researchers have approached the need for increased system safeguards and protection against lightning strikes.

Aircraft electromagnetic protection has always focused on the design, test, and analysis required for certifying aircraft. However, this effort is now being expanded by engineers at Cessna Aircraft Co. to include the continued airworthiness of electromagnetic protection over the entire life of the aircraft. To do so, engineers will require a better understanding of the scope and magnitude of maintaining assurance 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. These inspections have been successful in ensuring protection considering the low number of catastrophic occurrences involving lightning strikes. However, the continued effectiveness of electromagnetic protection methods becomes more evident as the use and complexity of avionics increases along with the growing amount of composites used in the manufacture of the aircraft.