What was found
AFTER LANDING, INITIAL VISUAL INSP REVEALED VERTICAL FIN COWLING DAMAGE, VIA TAIL ROTOR STRIKE. SUSPECT VERTICAL FIN COWLING ONLY PARTIALLY SECURED PRIOR TO FLIGHT. DURING FWD FLIGHT, COWLING SEPARATED(NOT A COMPLETE IN-FLIGHT SEPARATION) FROM L/H SIDE, ALLOWING TAIL ROTOR BLADES TO CONTACT COWLING, REPEATEDLY. POST LANDING INSP, REVEALED MINOR DAMAGE TO T/R BLADES, AND SIGNIFICANT DAMAGE TO VERT FIN COWLING(NO MISSING MATERIAL OR PARTS - COWL REMAINED IN TACT AND PARTIALLY ATTACHED TO ACFT, BUT DAMAGED). REPLACED BOTH T/R BLADES W/NEW SERVICEABLE BLADES AND BALANCED TO MFG SPECS. REPLACED VERT FIN COWLING W/SERVICEABLE COWLING. PERFORMED OPERATIONAL CHK FLIGHT W/NO OTHER DEFECTS NOTED OR ANOMALIES. ACFT FULLY RELEASED FOR LINE SERVICE.