Debonding of the blade skin may be a manufacturing anomaly or it could be caused by the use of unapproved cleaning or protective materials. Check the Robinson forum on Vertical Reference under “Corrosion”. It is apparent that Robinson operators and by extension all operators are using unapproved materials to protect their helicopters from corrosion. One Robinson pilot from Australia indicated that they used a product called Nutcreaker, which he said far out performs WD-40 which most certainly would result in debonding. Check it out.
