What was found
(AUS) INCORRECT STROBE LIGHT FITTED. THE INCORRECT LIGHT WAS APPROXIMATELY 50MM (1.96IN) HIGHER THAN THE ORIGINAL LIGHT. THIS EXTRA HEIGHT BROUGHT THE LIGHT INTO THE TRACKING AREA OF THE MAIN ROTOR BLADES WHICH CONSEQUENTLY IMPACTED ON THE LIGHT CAUSING UNREPAIRABLE DAMAGE TO ALL FOUR MAIN ROTOR BLADES. INCORRECT PART. PERSONNEL/MAINTENANCE ERROR. (OTHER CAUSE: INCORRECT STROBE FITTED) (CASA NR 510001641)