Recommendations for Aircraft or Engine Struck By Lightning

Damage to an aircraft that has been struck by lightning is often confined to a specific area of the structure. In such instances where the engine and its accessories, controls, fuel or exhaust systems are involved, it is necessary to evaluate and repair the damage before the aircraft is flown again.

Although the path of the lightning may appear to have been around the external housings of the engine components, it is nevertheless impossible to assess the internal damage that might have occurred by heat during the lightning discharge. Therefore, in the event the engine has been damaged by lightning, disassemble and inspect the component parts. Heat generated by the arcing effect of the electrical discharge can cause irreparable damage to the hardened surfaces of ball bearings, crankshaft bearing surfaces, camshaft lobes, gear teeth, and other parts that are surface hardened. These parts should not be reused if discoloration, cracks, or other indication of damage by lightning is evident.