What was found
PILOT PERFORMING AIRWORTHINESS INSPECTION FOUND A CRACK AT THE UPPER INBD TAB ATTACHMENT OF THE TRIM TAB ON THE YELLOW MAIN ROTOR BLADE. INSPECTED THE TRIM TAP & FOUND 10 MM CRACK AT TRIM TAB RIVET ATTACHMENT, 7 MM WAS ALLOWABLE & THE ACFT WAS TAKEN OUT OF SERVICE FOR THE TRIM TAB REPLACEMENT. MAIN ROTOR BLADE SN 1018 WAS REMOVED FOR TRIM TAB REPLACEMENT. THE TRIM TAB WAS REMOVED & THE TRIM TAB SURFACE WAS INSPECTED & THERE WAS DELAMINATION FROM 1 RIVET HOLE TO THE TE. THE TECH REP WAS CONTACTED & PICTURES SENT FOR THEIR OPINION. IT WAS DETERMINED THAT THE DELAMINATION WAS OUT OF LIMITS & THE BLADE WILL BE SENT FOR REPAIR OF THE TRIM TAB ATTACHMENT AREA & INSTALLATION OF A NEW TRIM TAB.