What happened
The pilot reported that the aircraft was operating on the downwind leg of the traffic pattern when the engine began to run roughly. In response to the rough running, the pilot applied carburetor heat, but this action caused the engine to quit completely. The pilot then attempted a turn toward a nearby area suitable for landing. However, the aircraft was unable to maintain altitude and collided with trees before reaching the intended landing site.
Findings
Weather conditions at the time of the accident were favorable for carburetor icing, suggesting that ice accumulation likely contributed to the engine failure. The pilot's background included normal operations of jet air carrier type aircraft, but most of their experience flying a Piper J-3 Cub was gained over 20 years prior to this flight. This significant gap in experience with this specific light aircraft type may have impacted the pilot's ability to manage the emergency effectively.
Safety message
This incident highlights the critical importance of regular proficiency training in older, less complex aircraft types, especially when transitioning from modern jet operations. Pilots must remain vigilant for signs of carburetor icing and understand the immediate effects of applying heat in varying weather conditions.