NTSB Identification: SEA04LA181.
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Accident occurred Friday, September 03, 2004 in Cottage Grove, OR
Probable Cause Approval Date: 02/24/2005
Aircraft: Hughes 369D, registration: N505ST
Injuries: 3 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.

At 1,000 feet AGL the pilot said the engine had a sudden loss of power and the collective became very heavy. After the pilot initiated an autorotation, he looked down and observed a split in the rotor rpm and the N2 needle. The pilot then elected to proceed to a rock pit he observed and initiated an autorotation. At 60 knots and 30 feet AGL, and just as the pilot pulled back on the cyclic to slow down, the helicopter impacted the ground with its left skid. The helicopter subsequently rolled over on its left side, sustaining substantial damage as the main rotor blades severed the tail boom. A post accident examination of the helicopter failed to reveal any anomalies which would have prevented normal operations.

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

In-flight loss of engine power during cruise for undetermined reasons.

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