Originally Posted by topendtorque
it appears that investigation has revealed that the blade had been being over zealously polished with a power drill attachment, thus heating the skin edges too much for the glue integrity.
Do you have the NTSB (or other) number for this investigation? To my best knowledge, and no offense to you as experienced person, the only source of information about not using power tools on the blades is the RHC safety course. If MY hazy memory is correct, not because of an incident or accident, but because _after_ the blade SB was out, some people started to use power tools instead of sand paper before applying new paint to the blades and RHC put an end to it.
Again, no offense, and I am not trying to protect RHC, generalspecific or HKAC. I just heard that story from another source (Pilots Safety Course) in another version.