What happened
The pilot reported noticing a burning smell shortly before experiencing a complete loss of engine power. With the engine no longer producing thrust, the pilot identified a nearby field as a potential landing site and initiated an emergency landing procedure. While maneuvering the aircraft toward the selected field, the pilot lost control of the situation, and the aircraft collided with trees.
The investigation
A post-accident examination of the aircraft revealed significant mechanical issues contributing to the event. Investigators found a hole in the exhaust manifold that had been caused by corrosion. This structural failure allowed hot exhaust gases to escape directly onto the air filter cover. An inspection confirmed indications of fire on this component, consistent with the burning smell reported by the pilot.
To determine if the engine itself was mechanically sound, an engine run was performed after the damaged air filter was removed. The test showed that the engine ran well at all RPMs, indicating that the power loss was likely due to the exhaust leak and subsequent fire damage rather than internal engine failure.
Findings
The primary factors leading to this accident included the corrosion of the exhaust manifold which created a hole, allowing exhaust gases to impinge on the air filter cover. This resulted in an in-flight fire that likely contributed to the loss of power or control. The pilot's decision to attempt a landing in a field while maneuvering resulted in a collision with trees.