NTSB Identification: LAX95LA138.
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Accident occurred Friday, March 17, 1995 in HARMON FIELD
Probable Cause Approval Date: 09/24/1995
Aircraft: BELL 47, registration: N6569H
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.

THE PILOT WAS PROCEEDING TO A LANDING AREA AT 400 FEET AGL WHEN HE EXPERIENCED A LOSS OF ENGINE POWER. HE AUTOROTATED INTO DENSE JUNGLE TERRAIN. EXAMINATION OF THE ENGINE REVEALED THAT THE OIL PRESSURE RELIEF VALVE WAS MISSING. THIS WAS THE FIRST FLIGHT SINCE A 100-HOUR INSPECTION WAS MADE THE DAY BEFORE. THE INSPECTION OF THE SAFETY WIRE SECURING THE VALVE IS NOT A PREFLIGHT ITEM FOR THE PILOT, NOR IS IT REQUIRED TO BE INSPECTED PRIOR TO FLIGHT.

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

an engine failure due to oil exhaustion from a missing oil pressure relief valve as the result of an improper maintenance inspection.

Full narrative available

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