What happened
While operating in instrument meteorological conditions at an altitude of 800 feet above the aircraft's service ceiling, the pilot notified air traffic control that the instrument panel had failed. At the time of the incident, the aircraft was flying at approximately 30,000 feet, and no icing conditions were present. Approximately 36 seconds after the reported panel failure, the aircraft began a right-hand roll. This roll intensified to 105 degrees before recovering slightly to 70 degrees, at which point the aircraft entered a right-hand descending turn.
The aircraft remained in this descending turn until it disappeared from radar near the crash site. The aircraft subsequently struck an open field in a nose-down orientation, resulting in significant fragmentation. There were no survivors.
Findings
Post-accident investigations of the engine, propeller, and flight control systems showed no signs of mechanical malfunction or failure prior to the impact. The aircraft's landing gear and flaps were in the retracted position, and all trim settings were found to be within standard operating parameters. Furthermore, the aircraft was confirmed to be within its proper weight and balance limits for the flight.
While the exact origin of the instrument panel failure remains undetermined, investigators ruled out a total electrical failure because the pilot was able to maintain radio communication with air traffic control. Although the source of the instrumentation issue was unknown, the investigation noted that following the procedures outlined in the pilot operating handbook could have likely restored flight data to the electronic flight display. The crew also had access to a standby attitude gyro, a compass, and the co-pilot's electronic flight display for attitude reference, provided those units were functioning.