Pilot Was Conducting An Agricultural Flight In The Turbo-Propeller Equipped Airplane When The Engine Lost Partial Power Analysis: The pilot was conducting an agricultural flight in the turbo-propeller equipped airplane when the engine lost partial power. The pilot was unable to maintain altitude and performed a forced landing in a nearby crawfish pond. The airplane came to rest inverted in the pond. The fuselage, upper wings, and empennage were substantially damaged during the forced landing. A postaccident engine examination revealed no evidence of preimpact engine failure that would have precluded normal operation. There were multiple indications that the engine was producing power at impact, including rotational rubbing marks in the compressor, compressor turbine (CT), and power turbine (PT); however, the engine’s power output at impact could not be determined.