What happened
During a routine test flight following recent engine modifications and maintenance, an aircraft experienced a critical failure shortly after departing from Malmen AFB. The flight was manned by a crew consisting of two pilots and two engineers.
As the aircraft was ascending, a fire ignited in the number one engine. In response to the emergency, both engineers successfully exited the aircraft via bailout and were subsequently located alive. However, the aircraft continued its descent toward Slaka Kyrka, approximately 4 km south of the airbase, where it impacted the ground. The resulting impact caused a massive explosion. The two pilots on board were killed in the accident.
Findings
The investigation determined that the crew experienced a loss of control during the initial climb phase as a direct consequence of the fire occurring in the number one engine.