As pointed out by user Freewheel in
Vertical Forums it
Originally Posted by Freewheel
(w)asn't that long ago that 206 owners were told to comply with an AD which called for a preflight inspection of main rotor blades (using blue dye).
And that despite those blue dye inspections being complied with,
Originally Posted by Freewheel
(u)ltimately a pair of those blades failed killing all on board.
The problem related to Long Ranger MR blades. The accident
report gives details about the bonding problems encountered here.
Transportation Safety Board of Canada - Aviation Investigation Report A11O0205.