NTSB Identification: FTW92FA077.
The docket is stored on NTSB microfiche number 46498.
Accident occurred Saturday, February 29, 1992 in MORGAN CITY, LA
Probable Cause Approval Date: 08/13/1993
Aircraft: BELL 212, registration: N92AL
Injuries: 1 Fatal.

NTSB investigators either traveled in support of this investigation or conducted a significant amount of investigative work without any travel, and used data obtained from various sources to prepare this aircraft accident report.

AN ATP RATED HELICOPTER PILOT EXPERIENCED AN INFLIGHT BREAKUP WHILE AT CRUISE FLIGHT AT 1,800 FEET MSL. CONTROL WAS LOST FOLLOWING MAST BUMPING AND MAIN ROTOR SEPARATION. THE MAIN WRECKAGE OF THE HELICOPTER WAS LOCATED IN A HEAVILY WOODED MARSH, IN ABOUT 5 FEET OF WATER, RESTING NEARLY UPSIDE DOWN. DEBRIS AND AIRFRAME COMPONENTS WERE FOUND SCATTERED FOR ABOUT 1,000 YARDS PRIOR TO THE MAIN WRECKAGE. ONE WITNESS OBSERVED THE MAIN ROTOR SYSTEM SEPARATE FROM THE AIRFRAME. THE MAIN ROTOR HUB, WITH BOTH MAIN ROTOR BLADES STILL ATTACHED, WAS FOUND ABOUT 200 YARDS FROM THE MAIN WRECKAGE. THE CAUSE OF THE MAST SEPARATION COULD NOT BE DETERMINED DUE TO THE LARGE NUMBER OF CRITICAL COMPONENTS THAT COULD NOT BE RECOVERED.

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

THE INFLIGHT SEPARATION OF THE MAIN ROTOR SYSTEM AS RESULTS OF THE MAIN ROTOR STATIC STOP CONTACTING THE MAST FOR UNDETERMINED REASONS.

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