On July 11, 2023, about 1800 central daylight time, a Magni M24 gyroplane, N123PS, was substantially damaged when it was involved in an accident near Mineral Point, Missouri. The pilot and passenger received minor injuries. The gyroplane was operated as a Title 14 Code of Federal Regulations Part 91 personal flight. The pilot reported that, while on the downwind leg of the airport traffic pattern, he heard a noise from engine or rotor felt a momentary “shudder.” The pilot performed a precautionary landing to a field. During the landing, the gyroplane touched down hard, bounced, and rolled on its right side. The gyroplane sustained substantial damage to the main rotor and fuselage. A postaccident examination of the gyroplane revealed that the air filter, which is mounted to the engine, was not located at the accident site. No other anomalies were detected with the airframe or engine when examined by the Federal Aviation Administration. Following the accident, the pilot returned to the accident site and conducted a grid-search to locate the air filter. Unable to locate it, he thought the air filter likely came loose and departed the gyroplane on the downwind leg, which struck the propeller and would have produced the loud noise and brief shudder that he encountered.