What happened
During a night flight conducted under instrument meteorological conditions, a commercial pilot departed an airport and entered a period of spatial disorientation. Shortly after takeoff, air traffic control observed the aircraft performing a right turn and requested an altitude verification. The pilot indicated uncertainty regarding his current altitude, suggesting he believed he was at 3,500 feet and reported a potential loss of gyro instrumentation.
As the flight continued, the controller noted that the aircraft was executing a continuous 360-degree right turn. The pilot acknowledged this observation but expressed that he was experiencing difficulties. Approximately three minutes and 23 seconds after the initial departure, all radio communication from the flight ceased.
Subsequent investigations at the crash site revealed that the aircraft had suffered a catastrophic structural failure. Specifically, the tail section and both wings had detached from the main airframe.
Findings
Post-accident analysis of the wreckage showed that the fractures found on the wing skin and wing structures were consistent with ductile overload. There was no evidence of structural issues such as stress corrosion or fatigue prior to the accident. The nature of the deformation on the wings suggested they were subjected to upward forces caused by positive loading. Furthermore, investigators found no malfunctions related to the engine, accessories, or the gyroscopic instruments.