and the case if the S76 where a lightning strike caused local hardening on the MRB spar which led to a catastophic failure years later.
http://www.aaib.dft.gov.uk/sites/aai...ection%204.pdf
and this for a puma.
http://www.aaib.dft.gov.uk/sites/aai...pdf_502987.pdf
http://www.aaib.dft.gov.uk/sites/aai...ma,_G-TIGF.pdf
actually lightning strikes are more destructive on modern composite blades than old fashioned metal ones as the conductive path is normally restricted to the leading edge erosion shield.