Event ERA24LA018

Factual narrative

On October 22, 2023, at 0935 eastern daylight time, an experimental, amateur-built Avid Aircraft, N246ML, was substantially damaged when it was involved in an accident near Knoxville, Tennessee. The private pilot was not injured. The airplane was operated as a Title 14 Code of Federal Regulations Part 91 personal flight. The pilot reported that after an uneventful preflight inspection and engine run-up, he departed runway 01 with the engine power set to 6,300 rpm. At 100 ft above the runway, he adjusted the engine rpm to 6,000. After about 1 minute of flying at an altitude of 400 ft agl, the engine decreased from 6,000 rpm to totally stopped within seconds. The pilot elected to land on a riverbank; however, the airplane contacted trees and a metal fence before coming to rest in the river. The pilot conducted a postaccident examination of the airplane’s two-stroke engine and found that the piston in the power take-off cylinder had seized during the accident flight. The pilot subsequently started the engine and it engine operated without any anomalies. The airplane’s most recent maintenance records were not located. The pilot reported the engine had accumulated about 177 hours of operation before the accident. He also stated the airplane had not been flown for about 10 years and was in poor condition when he purchased it. He reported that he did not perform any internal maintenance on the engine but did extensive work on the external components. The pilot reported that he had completed a preflight inspection and engine run-up with no anomalies noted. Shortly after takeoff, during the initial climb when the airplane was about 400 ft above the ground level (agl), the engine suddenly lost all power. The pilot elected to land straight ahead on a riverbank. During the landing, the airplane struck trees and a metal fence before coming to rest in the river, resulting in substantial damage to the wings and the fuselage. A postaccident examination of the airplane’s two-stroke engine was conducted by the pilot. The pilot reported that the piston in the power take-off cylinder (PTO) had seized. Source: NTSB Aviation Accident Database Retrieved: 2026-02-12

NTSB Findings

Hierarchical cause / factor breakdown from the FAA bulk avdata database. Each finding tagged C (Cause) or F (Factor).

• — Aircraft-Aircraft power plant-Engine (reciprocating)-Recip eng cyl section-Failure