As I said in an earlier post the S76 blade has a single hollow titanium spar which is a cold formed welded tube which is then hot formed into the aerofoil section. Pockets are attached to the spar to complete the aerofoil section. The whole blade is then covered in a metal mesh impregnated fibreglass sheath. From the diagrams I have seen I can't discern any secondary load path.
HF