Primary finding
Probable cause
The failure of the engine's number 4 cylinder intake valve keeper. Trees under the helicopter at the time of the loss of engine power were factors in the accident.
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NTSB investigation record
LAX91LA137
CompletedSikorsky H-19/s55· N9894
- Date
- March 19, 1991
- Location
- Richvale, CA
- Conditions
- VMC
- Record
- Completed
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