NTSB Identification: ANC82IA067
14 CFR Part 91: General Aviation
Incident occurred Wednesday, August 04, 1982 in NEAR BIG LAKE, AK
Probable Cause Approval Date: 08/04/1983
Aircraft: PIPER J-3, registration: N70604
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.

DURING CRUISE FLIGHT, THE AIRCRAFTS ENGINE LOST POWER AND BEGAN VIBRATING SEVERLY. AFTER THE PILOT TRIED UNSUCCESSFULLY TO REMEDY THE PROBLEM, HE EXECUTED AN EMERGENCY LANDING IN A MARSH. SHORTLY AFTER TOUCHDOWN THE AIRCRAFT BOGGED DOWN AND NOSED OVER. A TEARDOWN EXAMINATION OF THE ENGINE REVEALED THAT IT HAD EXPERIENCED AN INTERNAL FAILURE IN THE AREA OF THE #1 AND #2 CYLINDERS. WHILE THE EXACT MODE AND SEQUENCE OF FAILURE WAS NOT IDENTIFIED, EVIDENCE OF INADEQUATE LUBRICATION WAS OBSERVED.

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

ENGINE ASSEMBLY..FAILURE,PARTIAL

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