The pilot reported that during flight, the engine lost partial power. He applied the carb heat and adjusted the mixture, but the engine did not respond. The engine continued to lose power and the pilot force landed on rough terrain. During landing the right wing struck the ground.

Additionally, the pilot reported that the accident could have been prevented if he had, "checked for carb ice sooner."

He reported that the temperature about the time of the accident was 30° F, and that the dew point was 34° F.

The airplane sustained substantial damage to the right wing spar.

The pilot reported that there were no mechanical malfunctions or failures with the airplane that would have precluded normal operation.

According to the FAA Carburetor Ice Probability Chart, a serious icing probability existed at cruise or climb power.