What happened
During a period of level flight, the pilot experienced a failure of the left engine, which was accompanied by a fire warning light. In response to the warning, the pilot shut down the left engine. Shortly thereafter, the right engine began to lose power and operated irregularly. The pilot attempted to restart the left engine; however, neither engine was able to produce sufficient thrust to maintain the aircraft's altitude.
As a result of the loss of power, the pilot performed a forced landing on a highway. During the descent and impact, the aircraft struck a vehicle, which subsequently resulted in a fire. There were no fatalities reported in the incident.
Findings
An investigation into the left engine identified a cross-threaded fuel nozzle fitting, noting soot patterns located aft of the component. While the failure of the left engine was linked to this mechanical issue, investigators found no specific cause for the subsequent malfunction of the right engine. Additionally, the investigation found no documentation or evidence regarding the completion of an annual inspection for the aircraft.