NTSB Identification: ANC98LA032.
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Accident occurred Monday, March 30, 1998 in SOLDOTNA, AK
Probable Cause Approval Date: 02/11/2000
Aircraft: Aerospatiale AS-350B, registration: N158EH
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 slope landings in preparation for an upcoming check ride. According to the pilot, he was positioning the helicopter close to the hill in order to start the maneuver. The next thing the pilot recalls, the helicopter had rolled to its left, and was upside down and on top of the hill that he was attempting to land beside. The day following the accident, the pilot reported that he now suspected that the tail rotor drive shaft became disengaged, and caused the accident. The forward tail rotor shaft assembly, and a portion of the adjoining rear tail rotor drive shaft were examined by the NTSB Materials Laboratory for inspection. The inspection discovered no evidence of an in-flight disengagement of the tail rotor drive shaft assembly prior to impact.

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

The pilot's inadvertent dynamic rollover while performing a slope landing. Factors associated with the accident are the presence of rough and uneven terrain, and the pilot's improper slope landing technique.

Full narrative available

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