N350AP
AEROSPATIALE AS350B
THE PILOT AND PAX WERE CRUISING OVER THE PHILIPPINE SEA WHEN THE PILOT FELT AN EXTREME VIBRATION. THE PILOT MADE AN EMERGENCY LANDING IN THE 7-FT SEA. THE PILOT REPORTED THAT PRIOR TO THE HELICOPTER OVERTURNING HE OBSERVED THAT 'ONE OF THE ELASTOMERIC SPHERICAL THRUST BEARINGS WAS COMPLETELY GONE.' THE HELICOPTER SUBSEQUENTLY OVERTURNED, SANK AND HAS NOT BEEN RECOVERED. THE ACFT'S ROTOR SYSTEM HAD PREVIOUSLY BEEN INVOLVED IN A SUDDEN STOPPAGE MISHAP AND HAD THEREAFTER BEEN REPAIRED AND RETURNED TO SERVICE BY OTHER THAN THE CURRENT COMPANY MAINTENANCE PERSONNEL.
THE PARTIAL FAILURE OF A ROTOR SYSTEM COMPONENT FOR UNDETERMINED REASONS.
Source: NTSB Aviation Accident Database
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