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NTSB Prelim: Mooney M20E

While In Cruise Flight In A Gradual Descent, The Airplane’s Two Carbon Monoxide (CO) Detectors Began Alerting On April 2, 2024, about 1056 central daylight time, a Mooney M20E airplane, N86UM, sustained substantial damage when it was involved in an accident near Alpine, Arkansas. The pilot was not injured. The airplane was operated as a Title 14 Code of Federal Regulations Part 91 personal flight. According to the pilot, while in cruise flight in a gradual descent, the airplane’s two carbon monoxide (CO) detectors began alerting, and he felt symptoms of CO poisoning. The pilot closed the cabin vents, opened a small cockpit window, and attempted to open the door, but was unsuccessful.

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