NTSB Identification: ATL92LA017.
The docket is stored on NTSB microfiche number 46051.
Accident occurred Monday, October 28, 1991 in ROME, GA
Probable Cause Approval Date: 03/09/1993
Aircraft: BELL 47D-1, registration: N925V
Injuries: 2 Uninjured.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

THE PILOT HAD COMPLETED TWO TRAFFIC PATTERNS AND DURING THE THIRD TAKEOFF FOR ANOTHER APPROACH THE FLIGHT INSTRUCTOR FELT A THUMP IN THE AIRFRAME. IMMEDIATELY, HE ENTERED AN AUTOROTATION AND LANDED IN A WOODED AREA. EXAMINATION OF THE HELICOPTER DISCLOSED THAT THE TAIL ROTOR GEARBOX AND TAIL ROTOR ASSEMBLIES WERE MISSING. ACCORDING TO THE OPERATOR BOTH ASSEMBLIES WERE RECOVERED THE FOLLOWING DAY, HOWEVER THE NTSB WAS NEVER NOTIFIED OF THE RECOVERY. THE DAMAGED COMPONENTS WERE EXAMINED BY THE OPERATOR AND DESTROYED. ACCORDING TO THE MECHANIC, ONE ROTOR BLADE FAILED IN THE VICINITY WHERE AD 59-05-10 APPLIED; THE AD REQUIRED A DAILY INSPECTION OF THE TAIL ROTOR BLADES FOR CRACKS. ACCORDING TO THE PILOT, AN INSPECTION OF THE BLADES HAD BEEN COMPLETED PRIOR TO THIS FLIGHT.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

THE FAILURE OF A TAIL ROTOR BLADE FOR UNDETERMINED REASONS.

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