NEAR BIG LAKE, AK, USA
N70604
PIPER J-3
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.
Source: NTSB Aviation Accident Database
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