What happened
The incident occurred while the aircraft was engaged in an aerial application flight. During the operation, the engine suffered a catastrophic failure attributed to the loss of the number two cylinder. The root cause of this mechanical failure was a crack in the cylinder head, which subsequently ruptured two associated oil lines.
As a result of the ruptured lines, oil sprayed across the windshield, severely obstructing the pilot's forward vision. With engine power lost and visibility compromised, the pilot attempted to execute a forced landing in a nearby field. However, due to the blocked view and loss of thrust, the aircraft collided with a ditch during the landing attempt.
The investigation
The investigation focused on the mechanical failure of the engine. Examination revealed that the number two cylinder head had cracked, leading to the rupture of the oil lines. This mechanical breakdown was identified as the primary reason for the loss of engine power during the flight.
Findings
Several factors contributed to the outcome of this event. The cracked cylinder head led directly to the loss of engine power. Additionally, the oil-covered windshield significantly impaired the pilot's ability to see outside, hindering the execution of a safe forced landing. The combination of mechanical failure and obscured vision resulted in the aircraft impacting a ditch rather than clearing the terrain.
Safety message
This incident highlights the critical importance of engine maintenance and the potential hazards of oil leaks on visibility during emergency procedures. Pilots operating agricultural aircraft should be aware that internal engine failures can rapidly degrade external visibility, complicating forced landing efforts.