What was found
ABOUT 2 MINUTES PRIOR TO LANDING, A LARGE SUNSCREEN (3 FT X 4 FT) EXITED THE AIRCRAFT AND STRUCK THE TAIL ROTOR. CAUSING A PRONOUNCED VIBRATION IN THE TAIL ROTOR SYSTEM. THE PILOT SLOWED THE AIRCRAFT AND LANDED SAFETY ON THE RIG WITH OUT FURTHER INCIDENT. THE PILOT SHUTDOWN THE AIRCRAFT AND CONDUCTED A POST FLIGHT INVESTIGATION TO DETERMINE THE CAUSE. THE PILOT FOUND THE SUNSCREEN WRAPPED AROUND BOTH SIDES OF THE TAIL ROTOR. THE PILOT NOTICED DAMAGE TO BOT TAIL ROTOR BLADES, THE TAIL BOOM JUST FORWARD OF THE TALL ROTOR GEARBOX AND THE LOWER PART OF THE VERTICAL FIN INCLUDING THE TAIL STRINGER. (K)