What happened
During the approach phase, radar monitoring indicated that the aircraft was flying north of its intended flight path. The aircraft performed several changes in heading and descended to an altitude of 500 feet mean sea level. The pilot notified air traffic control of the intention to land at Shreveport and was provided with a new transponder code. Following this communication, no additional contact was established with controllers.
The aircraft subsequently struck utility poles, transmission lines, and trees approximately 19 miles northwest of the airport. The pilot, who was the only person on board, was killed in the accident.
Findings
Post-accident inspections of the propellers indicated significant irregularities. The right propeller spinner dome showed marks corresponding to 74 degrees, which is well outside the standard operating range of 17 to 35 degrees. In contrast, the left propeller blades exhibited only minor damage to the leading edges of the tips.
An investigation of the right engine uncovered several mechanical issues, including carbon accumulation in the intake and exhaust manifolds, worn and pitted valve seats, and pitted exhaust valves. Additionally, the spark plugs were worn, and compression levels were recorded below 60 on four cylinders. The magneto block was found to be separated, showing signs of fretting and pitting. The left engine and its associated components sustained extensive damage due to fire. Records indicated that the last annual inspection had been performed by the operator's maintenance staff 78 hours prior to the event. The investigation suggests that mechanical engine failure was a critical factor.