Sequence of Events
During a training flight, the pilot shut down the left engine while on the downwind leg to practice a single-engine approach to a 2,100-foot grass runway. Prior to landing, the pilot observed another airplane taking off in the opposite direction. To avoid a collision, the pilot executed a single-engine go-around and sidestepped to the right of the runway.
As the pilot pumped up the flaps while leaving the landing gear extended, the airplane was unable to maintain a positive rate of climb. The pilot then turned left toward a clear area. Upon completing the turn, the left wing and landing gear snagged power lines, causing the airplane to be pulled to the ground approximately 300 feet west of the runway.
The pilot did not report any malfunctions with the airplane during the incident.