What happened
While flying, the pilot attempted to switch fuel tanks from the auxiliary to the main position. Following this action, the left engine lost power. The pilot reported that the left selector lever felt very stiff and was difficult to move; despite attempts to recycle the lever, the power loss persisted.
Because the remaining engine provided insufficient power to maintain level flight, and it became clear the aircraft could not reach the intended airport, the pilot selected a suitable landing area along a dirt road. During the landing flare, the left engine suddenly produced a burst of power. This sudden surge induced a severe yaw and roll, resulting in the aircraft wing making contact with the ground.
The investigation
An FAA inspector examined the aircraft and discovered that the cable for the left selector valve was binding. Additionally, the valve was found to be stuck in an intermediate position between the main and auxiliary positions.