NTSB Identification: ERA13LA029
14 CFR Part 137: Agricultural
Accident occurred Friday, October 19, 2012 in Edison, GA
Probable Cause Approval Date: 11/06/2013
Aircraft: GRUMMAN ACFT ENG COR-SCHWEIZER G-164B, registration: N6670K
Injuries: 1 Minor.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

The pilot stated that he had completed an aerial application run in the airplane and began a left turn to return for another aerial application run. However, shortly after he began the maneuver, the airplaneā€™s engine lost total power. The pilot performed a forced landing to a field, during which the airplane nosed over. Examination of the radial engine revealed that the No. 1 cylinder k-pin had failed, resulting in significant internal engine damage and the loss of power. Further examination of the failed k-pin revealed that it had fractured near its center oil journal, and the k-pin fracture marks exhibited damage consistent with fatigue.

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

The total loss of engine power due to the fatigue failure of the k-pin associated with the No. 1 cylinder.

Full narrative available

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