NTSB Identification: BFO94LA098.
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Accident occurred Sunday, June 12, 1994 in JOHNSON CITY, NY
Probable Cause Approval Date: 01/26/1995
Aircraft: BELLAH ROTORWAY EXECUTIVE, registration: N727TB
Injuries: 1 Minor.

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 HELICOPTER WAS IN CRUISE FLIGHT WHEN A SUDDEN LOSS OF TAIL ROTOR EFFECTIVENESS OCCURRED. THE PILOT STATED THAT HE APPLIED ANTI-TORQUE PEDAL WITH NO EFFECT. THE PILOT ENTERED AN AUTOROTATION AND THE HELICOPTER CONTINUED IN A SLOW SPIN TO THE LEFT. THE PILOT STATED THAT HE UTILIZED FULL UP COLLECTIVE JUST PRIOR TO TOUCHDOWN, BUT THE HELICOPTER ROLLED ONTO ITS LEFT SIDE AFTER GROUND CONTACT AND WAS SUBSTANTIALLY DAMAGED. AN EXAMINATION OF THE WRECKAGE REVEALED THAT THE FORWARD TAIL ROTOR DRIVE BELT FAILED. THE PLIES ON THE BELT HAD SEPARATED. THE BELT HAD BEEN REPLACED AT THE LAST INSPECTION, AND HAD ACCUMULATED 57.9 HOURS SINCE NEW. THE CHANGE-OUT TIME FOR THE BELT AS RECOMMENDED BY THE COMPANY THAT PROVIDED THE KIT WAS 250 HOURS. A NEWER KEVLAR DRIVE BELT WAS RECOMMENDED BY THE COMPANY AFTER THE ACCIDENT. NO DISCREPANCIES OR UNRESOLVED OPEN ITEMS WERE FOUND IN THE MAINTENANCE LOG BOOKS.

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

THE FAILURE OF THE TAIL ROTOR DRIVE BELT DUE TO UNDETERMINED REASONS. THIS LED TO A LOSS OF DIRECTIONAL CONTROL AND AN AUTOROTATION.

Full narrative available

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