NTSB Identification: CHI93LA159.
The docket is stored on NTSB microfiche number 50229.
Accident occurred Wednesday, May 05, 1993 in GRAND FORKS, ND
Probable Cause Approval Date: 11/15/1993
Aircraft: SCHWEIZER 269C, registration: N7504D
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 PILOT WAS PRACTICING LANDINGS WHEN THE ACCIDENT OCCURRED. THE PILOT STATED HE LOWERED THE COLLECTIVE AND CENTERED THE CYCLIC IN ORDER TO STOP A GROUND RUN DURING THE LANDING. THE HELICOPTER BEGAN TO VIBRATE AND THE PILOT BROUGHT THE CYCLIC BACK TO CENTER, ROLLED OFF THE THROTTLE AND VERIFIED THAT THE COLLECTIVE WAS LOWERED. THE HELICOPTER CONTINUED TO SHAKE WITH THE BLADES STRIKING THE GROUND. THE SADDLE FUEL TANK SEPARATED FROM THE HELICOPTER AND A FIRE WAS INITIATED. THE PILOT WAS ABLE TO EVACUATE THE HELICOPTER PRIOR TO ITS BEING CONSUMED BY FIRE. POST ACCIDENT INSPECTION OF HELICOPTER AND ITS COMPONENTS NOT DESTROYED IN THE FIRE FAILED TO REVEAL ANY FAILURE/MALFUNCTION WHICH WOULD HAVE RESULTED IN THE ACCIDENT.

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

THE PILOT'S IMPROPER USE OF COLLECTIVE IN RECOVERING FROM A LOSS OF CONTROL DUE TO GROUND RESONANCE.

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