What was found
(CAN) PILOT WAS FLYING HELICOPTER AND FELT TWO SLIGHT YAWS TO THE RT APPROXIMATELY 30 TO 40 SECONDS APART. AT FIRST THE PILOT SUSPECTED IT MIGHT HAVE BEEN A GUST OF WIND, BUT THE SECOND YAW ALERTED THE PILOT TO A PROBLEM WITH THE TAIL ROTOR AS IT WAS ACCOMPANIED BY A NOTICEABLE RELUCTANCE OF THE AIRCRAFT TO RECOVER TO THE NOSE POINTED IN THE DIRECTION OF FLIGHT. THE PILOT MADE A SUCCESSFUL UNSCHEDULED LANDING WITH NO DAMAGE TO THE AIRCRAFT. UPON A MAINTENANCE INSPECTION OF THE T/R CROSSHEAD, IT WAS DETERMINED THAT THE DUPLEX BEARING INSIDE THE CROSSHEAD, BEARING P/N 204-011-761-001, HAD SEIZED. NEW PARTS WERE SUBSEQUENTLY ORDERED AND INSTALLED. PARTS HAVE BEEN SHIPPED TO MAIN BASE FOR FURTHER INVESTIGATION. (TC NR 20070828004)