NTSB Identification: FTW94LA124.
The docket is stored in the Docket Management System (DMS). Please contact Records Management Division
Accident occurred Friday, April 15, 1994 in ENGLEWOOD, CO
Probable Cause Approval Date: 12/07/1994
Aircraft: BELL 206L-3, registration: N937S
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.

WHILE CONDUCTING A TEST FLIGHT FOLLOWING INSTALLATION OF A FUEL CONTROL/GOVERNOR, THE ENGINE ACCELERATED TO MAXIMUM POWER AND COULD NOT BE CONTROLLED BY THE PILOT. THE PILOT SECURED THE ENGINE AND CONDUCTED AN AUTOROTATION. DURING TOUCHDOWN, THE MAIN ROTOR BLADES CONTACTED THE TAIL BOOM AND SEVERED THE TAIL ROTOR DRIVE SHAFT. EXAMINATION OF THE FUEL CONTROL/GOVERNOR REVEALED A PIECE OF ABRASIVE PAPER IN THE RESET SHAFT HOUSING. ACCORDING TO THE EXAMINATION REPORT, THIS WOULD CAUSE LOSS OF GOVERNOR CONTROL TO THE HIGH SIDE.

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

THE PILOT'S FAILURE TO MAINTAIN ROTOR RPM, HIS DELAYED FLARE, AND IMPROPER TOUCHDOWN. A FACTOR WAS A FAILURE OF THE FUEL CONTROL/GOVERNOR TO THE HIGH SIDE WHICH REQUIRED THE PILOT TO PERFORM A FULL AUTOROTATION.

Full narrative available

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