What happened
On April 20, 2006, at 10:04 AM, a Piper PA 28-140 departed from the Westerstede-Felde airfield for a VFR flight toward Leer-Papenburg. Shortly after takeoff, witnesses observed the aircraft entering a layer of clouds. Radar data from the DFS recorded a flight path oscillating between Linswege and Grafenfeld for approximately ten minutes.
During the flight, the aircraft transitioned from visual conditions into Instrument Meteorological Conditions (IMC). The air traffic controller on duty noted that the pilot appeared hectic during the final radio communications. While attempting to regain visual contact with the ground, the aircraft's altitude decreased until it struck a line of trees approximately 3.3 km from the airfield. The impact destroyed the aircraft and caused the death of the pilot.
The investigation
The BFU investigation examined radar and GPS data, which confirmed the erratic flight path. Meteorological records indicated that the area was under the influence of a weak cold front, resulting in low stratus clouds with bases as low as 200 to 500 ft AGL and visibility between 2 km and 7 km.
The investigation also reviewed the pilot's qualifications and medical status. The pilot held a private pilot license with approximately 80 total flight hours, 25 of which were on this specific aircraft type. Post-mortem toxicological analysis revealed the presence of the strong analgesic Tramadol in the pilot's system at therapeutic levels.
Findings
- The aircraft entered low-hanging clouds shortly after departure, leading to a loss of visual reference to the ground.
- The pilot, who was only rated for VFR flight, was unable to maintain control of the aircraft using instruments alone once IMC was encountered.
- In an attempt to regain visual contact with the terrain, the pilot allowed the aircraft to descend into obstacles.
- The loss of visual reference due to entering low clouds was the primary cause of the accident.
- The potential impairment of the pilot's psycho-physical performance due to the side effects of Tramadol, such as dizziness or impaired regulation, could not be ruled out.