NTSB Identification: DEN99LA173.
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Accident occurred Wednesday, September 29, 1999 in LONGMONT, CO
Probable Cause Approval Date: 06/22/2000
Aircraft: Enstrom 280C, registration: N84DH
Injuries: 1 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 practicing autorotations, the pilot, who was a commercial pilot in single and multiengine aircraft but a student pilot in helicopters, experienced a loss of engine power for unknown reasons. During the full autorotation, which was necessitated by the power loss, the landing was hard and resulted in main rotor flex, which cut off the tail boom. Density altitude at the time was 9,000 feet.

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

An inaccurate touchdown during a full autorotation, which resulted in main rotor flex which cut off the tail boom. Factors were the pilot's lack of total experience in helicopters and high density altitude.

Full narrative available

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