Luscombe 8F accident near Comstock, Texas, July 18, 2021

The NTSB's narrative final · quoted from the NTSB record

The pilot departed on a personal flight, and the wreckage was located about 20 nautical miles from the departure airport by the property owner. There were no witnesses to the accident. Recorded data showed that, after maneuvering over the area of the accident site for about 6 minutes, the airplane entered a near-vertical descent. The airplane impacted terrain and was destroyed. The wreckage was consistent with a wings-level, near-vertical impact. Postaccident examination revealed no mechanical anomalies that would have precluded normal operation. Toxicology testing of the pilot identified ethanol. The large discrepancy among the ethanol levels in muscle, heart, and liver indicates that at least some of the detected ethanol was likely from sources other than consumption. Notably, the severity of injury made postmortem microbial ethanol production more likely, and the detectable n-propanol and n-butanol in muscle and heart indicate likely postmortem microbial activity in these tissues (although such activity does not always produce ethanol). Although at least some of the detected ethanol was likely from sources other than consumption, the available ethanol results are insufficient to exclude the possibility that consumed ethanol may have exerted impairing effects on the pilot, particularly given that diphenhydramine was also detected. Like ethanol, diphenhydramine may exert impairing sedative effects, and such effects may combine with those of ethanol. There is insufficient medical and operational evidence to determine whether ethanol or diphenhydramine caused impairment that contributed to the accident.

The complete narrative as the NTSB published it. The NTSB's docket holds the report as a PDF and any photographs, statements and other documents from the investigation.