What happened
A private pilot was operating a single-engine, float-equipped aircraft at a low altitude when the aircraft encountered conditions conducive to carburetor icing. At the time of the incident, the pilot reported that the carburetor heat was only approximately 60% engaged. Upon applying power in an attempt to climb, the engine failed to respond initially and subsequently began running roughly.
The pilot attempted to rectify the situation by applying full carburetor heat; however, the engine choked and suffered a further loss of power. Consequently, the pilot performed a forced landing in a nearby swamp. During the landing sequence, the aircraft nosed over. The pilot was not injured during the event.
Following the accident, the aircraft was recovered from the swamp. Upon removal, the pilot observed that the engine started and operated normally.
Findings
The investigation noted that the engine performance issues were linked to the pilot's management of carburetor heat while flying in icing conditions.
Safety message
The accident could have been prevented through the early detection of carburetor ice and the timely application of carburetor heat.