What happened
The incident occurred while the twin engine aircraft was conducting a routine training mission. During the flight, the machine lost control and entered an uncontrolled descent. The aircraft ultimately impacted the ground in an open field area. There were no survivors; all four individuals on board were killed in the crash.
Findings
The source material does not provide specific technical details regarding the mechanical failure or pilot error that led to the loss of control. It only confirms that the aircraft went out of control during the training exercise and crashed into an open field.