What happened
The aircraft was established in cruise flight when the engine suddenly failed. Despite multiple attempts to restart the powerplant, all efforts were unsuccessful. With no available airfield nearby, the pilot elected to execute a forced landing into a soft field. During the touchdown and subsequent rollout, the aircraft nosed over.
The investigation
Following the accident, a detailed examination of the engine was conducted to determine the root cause of the failure. Investigators discovered that the #1 engine exhaust valve had fractured just above the skirt area. The broken component had been ingested into the engine core, causing catastrophic internal damage and subsequent loss of power.
Findings
The primary factor leading to the accident was the ingestion of the failed exhaust valve. This mechanical failure resulted in an in-flight shutdown that could not be restarted. The pilot's decision to land in a soft field was appropriate given the circumstances, but the terrain contributed to the nosing-over incident.
Safety message
Regular inspection of engine components, particularly exhaust systems, is critical to prevent foreign object ingestion and subsequent engine failure.