What happened
On September 14, 2014, at 12:55 local time, a Robin DR 400/180, registration S5-DKL, was conducting a commercial panoramic flight from Divača Aerodrome. The flight was intended to follow a route toward the Adriatic coast, specifically visiting Portorož, before returning to the home base. The aircraft was carrying a pilot and three passengers.
Following takeoff from the grass runway in direction 29, the aircraft turned westward. Shortly after departure, the aircraft entered a left bank and entered a descent, impacting the terrain approximately 420 meters from the threshold of runway 11. The impact caused the aircraft to catch fire, resulting in the total destruction of the airframe. The accident resulted in two fatalities among the crew and passengers, while one passenger sustained serious injuries.
The investigation
The investigation examined the aircraft's maintenance records, flight documentation, and the pilot's experience. Technical analysis included a spectral analysis of audio from a video recording captured by an observer on the ground. This analysis confirmed that the engine and propeller systems were operating normally, with the engine running at approximately 2450 RPM at the closest point of approach. The investigation also reviewed the aircraft's weight and balance, noting that the aircraft was operating at its maximum takeoff weight.
Findings
- The direct cause of the accident was the impact with the terrain following a loss of control due to an aerodynamic stall immediately after takeoff.
- The pilot attempted to fly the aircraft at its maximum weight and beyond its performance capabilities.
- The pilot deviated from manufacturer instructions regarding minimum airspeed requirements.
- The pilot lacked sufficient experience with this specific aircraft type.
- The aircraft was operating at its maximum takeoff weight, which significantly impacted performance during the climb.
- There were deficiencies in the oversight and monitoring by the aviation regulatory authority.
- The operator lacked established internal procedures to ensure the competence of personnel performing flight activities.