NTSB Identification: DFW05IA119.
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Nonscheduled 14 CFR
Incident occurred Friday, May 13, 2005 in S.Timbalier 265, GM
Probable Cause Approval Date: 10/27/2005
Aircraft: Eurocopter France EC120B, registration: N588SC
Injuries: 2 Uninjured.

NTSB investigators used data provided by various sources and may not have traveled in support of this investigation to prepare this aircraft incident report.

While in cruise flight approximately 14 miles south of Port Fourchon and while 500 feet above the water, the 2,117-hour pilot observed the engine low oil pressure light illuminate and shortly thereafter the helicopter lost total engine power. The pilot elected to turn into the wind, inflate the floats, and perform an autorotation to the water. After a successful autorotation, the pilot and passenger disembarked the helicopter without injury and were rescued. An examination of the engine on May 25, 2005 at Turbomeca USA revealed the total loss of engine power was a result of an interruption of engine lubrication due to excessive swelling of the oil pump assembly's check valve piston o-ring, part number 79-24-05-01-240.

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

The loss of engine power as result of the failure of the oil pump assembly.

Full narrative available

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