NTSB Identification: ATL95LA169.
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Accident occurred Saturday, September 16, 1995 in PLAINS, GA
Probable Cause Approval Date: 04/29/1996
Aircraft: AIR TRACTOR AT-301, registration: N2362D
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.

During the first spray run of an aerial application flight, the engine lost power. Subsequently, the aircraft nosed over during a forced landing and was damaged. An examination of the engine revealed that the number four cylinder rocker arm housing had fractured. The fracture surface had a rough, granular, and irregular appearance, typical of overload failure. There was evidence that when the rocker arm housing became separated from the cylinder, the rocker arm pin failed, allowing the rocker arm to separate from the cylinder and resulting in a loss of continuity to the exhaust valve. The exhaust valve then remained closed, and the engine lost power.

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

Failure of the number four cylinder rocker arm housing and pin, which resulted in a closed exhaust valve and loss of engine power.

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