NTSB Identification: FTW01LA143.
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Accident occurred Thursday, June 14, 2001 in Okmulgee, OK
Probable Cause Approval Date: 07/01/2002
Aircraft: Commander 114-B, registration: N114BW
Injuries: 1 Minor.

NTSB investigators may have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

The flight had been airborne for three hours when the pilot heard a "loud bang" and the engine lost total power. He executed a forced landing to a field, during which the airplane contacted dirt mounds that were 4 feet high, before it came to a stop upright. Postaccident examination of the airplane revealed that fresh engine oil was adhering to the left side of the fuselage from the engine cowling extending back to the empennage. The oil dipstick was removed and indicated only 2 quarts (8 quart capacity). The oil was black and smelled as though it had been exposed to heat. The engine crankcase displayed a 2.5-inch diameter hole between the #5 and #6 cylinders. The engine was disassembled and it was noted that the connecting rod for the #6 cylinder had separated from its piston and the crankshaft. The #6 connecting rod journal displayed evidence of thermal damage and metal transfer. Metallurgical examination of the #6 connecting rod end cap and bolt revealed fractures indicative of overstress at extreme temperatures. Additionally, the rod end cap bearing surface displayed fretting and metal transfer. No other anomalies with the engine were noted.

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

the failure of the #6 cylinder's connecting rod, which resulted in a complete loss of engine power. A contributing factor to the accident was the lack of suitable terrain for the forced landing.

Full narrative available

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