What happened
During a cross-country flight traveling from Dallas to Wichita, an aircraft entered its final approach at Norman, Oklahoma. After receiving clearance to land, the aircraft ceased all radio communication with ground control. While on short final, the aircraft performed a sudden right turn and leveled off before entering a steep, climbing right turn. The aircraft continued to roll until it reached an inverted position, subsequently pitching nose-down into the ground.
Evidence from the crash site indicated that both propellers were spinning at high RPM during the impact. The accident occurred during a phase of flight involving a go-around or an aborted landing attempt. There were no reports of mechanical malfunctions or failures prior to the impact.
Findings
Investigations into the wreckage revealed that a fire occurred following the crash, which burned most intensely and persistently in the center of the cabin. Within this area, investigators discovered components that appeared to be part of an auxiliary fuel system. It was noted that the occupant in the right seat had recently been involved in installing what seemed to be this supplemental fuel system. The accident resulted in two fatalities.
While the exact reason for the loss of control remained undetermined, the aircraft's flight path transitioned from a standard approach into an uncontrolled descent and collision with terrain.