What was found
(CAN) THE BO105 BASED IN THE WEST HAS IN THE PAST EXPERIENCED PROBLEMS WITH PAINT EROSION ON THE TAIL ROTOR BLADES. NEW STYLE BLADES WERE INSTALLED IN THE BELIEF THAT THIS WOULD SOLVE THE PROBLEM WE WERE EXPERIENCING WITH PAINT EROSION. 50 HOURS AFTER INSTALLATION & FLT THROUGH MINOR AMOUNTS OF RAIN. MX ENGINEER NOTICED EROSION OF PAINT FROM LEADING EDGE NEAR THE TIP OF THE BLADE. MANUFACTURER REQUESTED THESE BLADES FOR ANALYSIS TO DETERMINE WHY THE PAINT WAS NOT ADHEREING TO THE SURFACE. IN THE MEANTIME WE WERE DIRECTED BY TH E MANUFACTURER TO LIGHTLY SAND & FEATHER THE AFFECTED AREA. THIS WAS DONE AND BLADES REMAINED INSERVICE FOR AN ADDITIONAL 50 HOURS PRIOR TO ARRIVAL OF REPLACEMENT BLADES.