NTSB Identification: ATL01LA108.
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Accident occurred Friday, September 07, 2001 in Berry, AL
Probable Cause Approval Date: 08/28/2002
Aircraft: Bell 47G, registration: N6327D
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 maneuvering, at a low altitude, the pilot heard "a pop or a bang outside the helicopter." As the pilot started a left turn, he noticed a "mushiness" in the cyclic control, followed by a loss of left and right cyclic control. The pilot attempted to reach a clearing, but the helicopter went into an uncommanded left turn. When the pilot attempted to slow the helicopter with the collective, the helicopter tilted back to the right, impacted a small tree, touched down on its right skid first, and flipped up on its nose. Examination of the wreckage revealed "ground metal shavings" near the rotor head stabilator damper horn assembly where the control horn attach to the splined shaft.
The National Transportation Safety Board determines the probable cause(s) of this accident to be: The failure of the main rotor system stabilizer damper control horn assembly, resulting in an uncontrolled descent and subsequent collision with a tree and terrain. Full narrative available
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