Aviation Accident Summary CHI92LA015

LAKE GENEVA, WI, USA

Aircraft #1

N10JF

NORTH AMERICAN NAVION D

Analysis

THE PILOT CLIMBED TO CRUISE ALTITUDE AND HAD SET POWER BEFORE THE ENGINE VIBRATED BRIEFLY AND QUIT. THE PILOT EXECUTED A FORCED LANDING IN A ROUGH FIELD. ENGINE TEARDOWN REVEALED A BROKEN CRANKSHAFT. THE FRACTURE SURFACE SHOWED FATIGUE EMANATING FROM A SCRATCH IN A FILLET AT THE NUMBER 2 MAIN BEARING JOURNAL.

Probable Cause and Findings

FATIGUE FAILURE OF THE CRANKSHAFT. A FACTOR IN THE ACCIDENT WAS INADEQUATE QUALITY CONTROL BY OTHER MAINTENANCE PERSONNEL.

 

Source: NTSB Aviation Accident Database

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