What happened
The aircraft had climbed to approximately 7,500 feet when the pilot experienced an overspeeding condition on the left engine. In response, the pilot turned back toward Waco and feathered the left propeller. While receiving emergency vectors to an airport, the right engine also quit. As the pilot broke out of the overcast, a pasture was spotted, and the gear was pumped down in an attempt to land. The aircraft was unable to reach the pasture and collided with trees.
The investigation
Examination of the left propeller governor revealed scoring on the cup, which served as evidence of the overspeed condition. However, further inspection did not reveal any specific cause for this condition. No preimpact failure or malfunction of either engine was found.