Amateur-built RV-8 accident near Van Cleve, Kentucky, May 24, 2021

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

During a cross-country flight at cruise altitude, the pilot reported a loss of engine oil pressure and loss of engine power to air traffic control and subsequently performed a forced landing to a field. The airplane impacted the ground and the wreckage was partially consumed by a post impact fire. Examination of the wreckage revealed oil staining on a portion of the horizontal stabilizer and broken pieces of the windscreen that were found at the site. Examination of the engine revealed that with the exception of the oil sump, which had been partially consumed by the postimpact fire, the crankcase, cylinders were intact, and continuity of the crankshaft and valvetrain were confirmed. The examination also found that an oil line connecting the engine to an aftermarket oil valve had separated, though it could not be determined if the separation occurred prior to, or as a result of the airplane’s impact with the ground. Overall, the engine did not display signatures consistent with a catastrophic loss of engine power and accompanying breach of the engine crankcase. Given the pilot’s report of a loss of oil pressure (and loss of engine power), and the oil staining observed on the wreckage, it is likely that such a failure was imminent. Given the extent of the fire damage to the engine, the reason for the loss of oil pressure could not be determined. A review of the pilot’s pathological information revealed the presence of ethanol, which was most likely from postmortem production rather than ingestion. Therefore, the presence of ethanol did not contribute to the circumstances of 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.