strange marks on S76 blades
Hello and season greetings to you all !
A strange thing happened on some of our S76 blades....Very small, few, pin hole like marks,showing a burning aspect, making think of lightning strikes or sparks (they are also sometime present on horizontal stabiliser and T/R blades) They are deep enough to go trough the protective coating.
Of course, affected helicopters are grounded for deeper investigation.
It seems strange that ligthning strike (a rather rare phenomenom on helicopters here) affect more than one helicopter at once in such a short period of time.
What else could it be ? Did some of you ever seen something similar....could it be related to static electricity or maybe some flaming oil dropllets caught in oil rigs flares smoke ?