Townsend, MT, USA
N822TT
Champion 7GCBC
The private pilot reported that, during the local pleasure flight, the engine started to run roughly and that he thought that it was due to carburetor ice. The pilot applied carburetor heat, and after about 3 minutes, the engine still did not seem like it was running smoothly. The pilot initiated a climb; however, the airplane would not gain altitude, so he chose to make a precautionary landing on a sandbar in a river. After touchdown on the rough and bumpy surface, the pilot applied braking action. The wheels dug into the soft sand, and subsequently the airplane nosed over and came to rest inverted. The wings and the left lift strut were substantially damaged. The pilot reported that there were no preaccident mechanical failures or malfunctions with the engine or airplane that would have precluded normal operation. The nearest weather reporting facility, located about 27 nautical miles northwest of the accident site, reported that, about the time of the accident, the temperature was 30°F and the dew point was 16°F, which was near the range of atmospheric conditions being conducive to icing at glide and cruise power settings. .
The private pilot reported that during the local pleasure flight the engine started to run rough and he thought that it was as a result of carburetor ice. The pilot applied carburetor heat and after about 3 minutes the engine still did not seem like it was running smoothly. The pilot initiated a climb, however the airplane would not gain altitude so he opted to make a precautionary landing on a sandbar in a river. After touch down on the rough and bumpy surface, the pilot applied braking action. The airplane nosed over and came to rest inverted after the wheels dug into an area of soft sand. The wings and the left side lift strut were substantially damaged. The pilot did not report any mechanical failures or malfunctions with the engine or airplane that would have precluded normal operation. The nearest weather reporting facility was located about 27 nautical miles to the northwest of the accident site. About the time of the accident, the reported temperature of 30oF and dew point of 16oF was at the edge of the range on the carburetor probability chart of icing at glide and cruise power.
The pilot's failure to maintain airplane control during a precautionary landing on an uneven, soft surface.
Source: NTSB Aviation Accident Database
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