What happened
On March 22, 2010, a pilot was operating a Valentin Taifun 17E motor glider on a flight from Nordhorn-Lingen to Mainbullau. The purpose of the flight was to undergo an annual inspection at an aviation maintenance facility. The pilot had performed a pre-flight inspection, which included removing the engine cowling to visually check the engine.
The flight proceeded without incident until the aircraft reached the vicinity of Bad Hersfeld. At approximately 11:30 local time, the pilot and passenger experienced a loss of engine power followed by the development of smoke. Coolant and oil leaked from the engine, coating parts of the cockpit canopy. The pilot subsequently initiated an emergency landing in a field near Bad Hersfeld-Heenes. During the approach, an engine fire developed, which significantly obscured the pilot's visibility within the cockpit. Upon landing in the field, the aircraft's landing gear collapsed.
The investigation
The BFU examined the wreckage and the engine components of the Valentin Taifun 17E. The investigation focused on the cause of the fluid leaks and the subsequent fire. Physical examination of the engine and surrounding components revealed significant fire damage to the engine, accessories, engine mount, and the upper and lower engine cowlings. The cockpit windshield also showed signs of fire damage.
During the inspection of the wreckage, investigators discovered bite marks on the coolant hoses and fuel lines. Additionally, remnants of an animal nest and food supplies were found inside the aircraft structure.
Findings
- The engine fire and loss of power were preceded by the leakage of oil and coolant.
- Bite marks on the coolant hoses and fuel lines were identified during the wreckage examination.
- The presence of an animal nest and food within the aircraft suggests that animal activity contributed to the damage of the engine lines.
- The landing gear collapsed during the impact, resulting in heavy damage to the aircraft, including delamination of the wing sections and destruction of the nose gear.