What happened
On April 22, 1999, a pilot departed Damme airfield (EDWC) for a flight to Merseburg (EDAM) in a Piper PA 28R-201T. After picking up the aircraft from a maintenance facility and refueling, the pilot began the VFR flight at 15:28 CEST.
Radar tracking indicated that the aircraft did not follow a direct course but instead flew over the northern Harz mountains toward the Brocken peak. At approximately 16:07, the pilot altered the course 50 degrees to the south and began descending from FL 97. During this descent, the aircraft's speed increased significantly, reaching approximately 180 knots, which matched its maximum operating speed (VNE).
At 16:12, the aircraft's flight path underwent an abrupt, steep downward deviation. Witnesses near Ilfeld reported hearing an explosion followed by the aircraft and debris falling into the heavily forested, rugged terrain. The aircraft struck a steep southwest-facing slope, resulting in a post-impact fire that destroyed the cockpit and wing sections. The pilot was killed in the accident.
The investigation
The BFU examined the wreckage, which was recovered and transported to Braunschweig. While the intense fire destroyed much of the central fuselage and instrumentation, the tail section remained largely intact. Investigators found that the wingtips and horizontal stabilizer had separated from the fuselage and were discovered hundreds of meters away.
Analysis of the structural components revealed no evidence of corrosion, fatigue cracks, or improper repairs. Instead, the breakage patterns showed clear signs of high-stress failure. The trailing edges of the wings were bent downward and twisted, and the horizontal stabilizer showed asymmetric damage. The trim was found set to an extreme nose-heavy position.
Medical examinations of the pilot revealed the presence of both carbon monoxide and cannabinoids (THC) in the bloodstream, indicating recent cannabis use. Additionally, the investigation noted the physiological effects of flying at high altitudes with reduced oxygen levels.
Findings
- The aircraft reached its maximum operating speed (VNE) during a stable descent, leaving no margin for aerodynamic loads.
- The structural failure was likely caused by a combination of high airspeed, a negative gust, and an abrupt control input (pitch down/roll) that created an overwhelming aerodynamic moment.
- The pilot's perception and decision-making may have been impaired by the use of cannabis and the effects of hypoxia (oxygen deficiency) at altitude.
- The aircraft's design, specifically the structural strength of the PA 28 series, provided very little margin for error when operating at the edge of its flight envelope.