NTSB Identification: LAX83FUA03.
The docket is stored on NTSB microfiche number 20688.
Accident occurred Thursday, February 10, 1983 in IRVINE, CA
Aircraft: BELL 47G-5, registration: N1375X
Injuries: 1 Uninjured.

NTSB investigators either traveled in support of this investigation or conducted a significant amount of investigative work without any travel, and used data obtained from various sources to prepare this aircraft accident report.

THE HELICOPTER LANDED HARD IN A FIELD OFF THE AIRPORT FOLLOWING AN ENGINE POWER LOSS. THE ACFR HAD LIFTED OFF AND ONLY TRAVELED ABOUT 50 FEET AT 15 FEET AGL WHEN THE POWER LOSS OCCURRED. AN ENGINE TEARDOWN REVEALED THAT THE RINGS ON 3 CYLINDERS HAD NOT SEATED AND WERE LEAKING OIL INTO THE COMBUSTION CHAMBERS. THE PLUGS IN THESE CYLINDERS WERE CARBON FOULED.

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

ENGINE ASSEMBLY,RING..LEAK

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