Incident Overview
A flight intended for dropping parachutists experienced an engine power loss shortly after takeoff. The pilot reported that all operations during start, taxi, and takeoff were normal. As the airplane climbed through an altitude of 150 feet above ground level (AGL), the engine lost power.
Forced Landing
The pilot configured the aircraft for a forced landing in a field. During the descent, the engine produced partial power, momentarily regained full power, and then returned to partial power. This fluctuating power output continued until touchdown.
Landing and Collision
During the landing roll, the airplane collided with a fence. No other details about damage or injuries were provided in the source.
Carburetor Icing
A carburetor icing chart applicable to the flight conditions indicated that the aircraft was operating in conditions conducive to serious icing at cruise and climb power settings. The pilot had not utilized carburetor heat during the flight.
Conclusion
The source did not provide an explicit probable cause statement, but the noted carburetor icing conditions and the pilot's non-use of carburetor heat are relevant facts.