What happened
Prior to the accident, the pilot aborted a takeoff attempt due to poor acceleration. During this time, the pilot dropped off his passengers; one passenger, who was also a pilot, advised the pilot to have a mechanic inspect the aircraft before further flight. The pilot agreed but proceeded with a subsequent takeoff.
The deplaned pilot observed that the aircraft climbed to approximately 15 feet above the runway before descending about 10 feet. As the aircraft began a left turn, the wingtip dragged in the dirt, causing a rupture in the left wing's fuel tank area. The aircraft then collided with the ground, spinning around and coming to a stop while engulfed in flames.
The investigation
An examination of the propeller and flight control system revealed no mechanical anomalies. While the engine showed mechanical continuity throughout, investigators found that the camshaft lobes on engine cylinders number 5 and 6 were worn down. This wear resulted in the valves opening to only about 30 percent of the manufacturer's prescribed distance.
A toxicology report from the FAA's Civil Aero Medical Institute (CAMI) identified high levels of prescription narcotic painkillers in the pilot's blood and liver fluids. A review of the pilot's medical records showed a history of low back pain for which he had been prescribed large amounts of narcotic painkillers, as well as coronary artery disease with an angioplasty performed on 8/10/94. The pilot did not hold a current medical certificate.
Findings
- Significant wear on camshaft lobes in cylinders 5 and 6 restricted valve opening.
- Presence of high levels of prescription narcotic painkillers in the pilot's system.
- The pilot was flying without a valid medical certificate.