What happened
Following standard pre-flight engine checks, the aircraft began its takeoff roll with flaps set to the full up position. The aircraft type achieved liftoff approximately 1,500 feet along the runway and reached an altitude of roughly 50 feet. After the landing gear was retracted, observers estimated the airspeed to be between 105 and 110 miles per hour.
Approximately 3,000 feet from the departure point, components were seen detaching from the left engine. The aircraft entered a shallow left turn, during which the left propeller appeared to have reached a fully feathered state. As the flight continued in this leftward turn, the plane began a gradual descent. The aircraft eventually struck a grove of trees located 1.5 miles southeast of the airfield, at an elevation 256 feet lower than the airport's elevation.
The initial impact with the treetops occurred on a heading of about 60 degrees. As the aircraft moved through the canopy, it completed a 180-degree anti-clockwise turn. The collision caused the fuel tanks to rupture, resulting in a fire that destroyed the fuselage. The accident resulted in 16 fatalities and 7 serious injuries. Those who survived were able to exit via the right rear escape hatch or through broken windows on the right side of the aircraft.
Findings
Investigations concluded that the primary factor was the failure of the left engine shortly after takeoff. This mechanical failure was compounded by increased aerodynamic drag caused by the loss of the left engine cowling. Additionally, the right engine's power output was insufficient due to the right propeller remaining in a high pitch position.