5-72 Lightning Strike
Lightning strikes are extremely rare for helicopters operating in VFR conditions.
If a lightning strike does occur, RHC recommends performing a 100-hour inspection per
§ 5-45 and performing the inspection for lightning strike damage per Rolls-Royce RR300
Operation and Maintenance Manual (OMM).
High voltage that is well conducted through the aircraft structure will dissipate and cause
minimal damage. High voltage that is not well conducted through the aircraft structure
can result in excessive heat, which can bake, burn, char, or even melt certain materials.
Heat damage may or may not be detectable by visual inspection. A component may not
exhibit obvious damage, but temperatures above 300º F can alter the strength of some
materials and thus affect a component's service life and airworthiness.
Visually inspect main rotor blades, landing gear, drive train, airframe, and flight controls
thoroughly for obvious damage such as electrical arcing or burns, pitting, or cracking.
Particular attention should be given to rod ends, journals, etc., where the conductive
path is most susceptible. If obvious damage is detected in any of the above-mentioned
systems, additional components may require replacement. Contact RHC Technical
Support with detailed documentation for further guidance prior to approving aircraft for
return to service.
Page 5.50 Chapter 5 Inspections MAY 2015
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