Synopsis
During a cruise flight conducted by a private pilot, the airplane suffered a partial loss of engine power. The pilot activated the carburetor heat control, after which the engine RPM momentarily increased before decreasing further. Subsequently, the pilot executed a forced landing onto the ocean surface adjacent to a beach.
Post-Accident Examination
An airframe and powerplant mechanic, who held inspection authority, performed an examination of the engine assembly and its accessories. The examination found no evidence of any mechanical failure or malfunction that existed prior to the accident. All examined components were deemed to have been operating normally.
Conclusion
The investigation did not yield a determination regarding the cause of the reported partial loss of engine power. The reason for the power reduction remains unidentified.