Post-Assembly Test Flight Crash in Seville (EC-403)

Incident Overview and Flight Details A newly manufactured aircraft, which had just left the manufacturer in Seville, was conducting its first post-assembly test flight. The aircraft took off from Seville-San Pablo Airport Runway 09 at 1254 local time. Following takeoff, the crew executed a 90-degree left turn heading north. Shortly after this maneuver, three of the four engines (numbered 1, 2, and 3) became stuck at high power. The crew attempted to return the power settings to normal mode, but the affected engines did not respond. After selecting the thrust levers to idle, the power regime for those three engines remained blocked in the idle position. Consequently, the crew decided to return to the airport for an emergency landing. During the approach, the aircraft collided with power lines, stalled, and crashed into an open field located 1.6 kilometers north of the airport. The aircraft subsequently burst into flames. Two crew members were rescued, while four others were killed. The aircraft was completely destroyed by the post-crash fire. The flight was part of a test program conducted prior to the aircraft's delivery to the Turkish Air Force (Türk Hava Kuvvetleri).