I’ve been flying for 30 years and never experienced a hiccup from an airplane engine while airborne. That changed a few minutes into a recent flight. This story can’t rival a sudden engine stoppage and forced landing—it’s a story of an engine that seemed on its way to quitting—but I hope it provides some useful lessons.
Detonation Grounds a Mooney
Key Takeaways:
- A pilot experienced sudden, severe engine roughness and vibration mid-flight, necessitating a Mayday call and an immediate turn towards the nearest airport.
- The pilot identified an overheating cylinder via the engine monitor and successfully restored normal engine operation by pushing the mixture to full rich, highlighting the value of both quick action and monitoring systems.
- Post-landing inspection revealed a cracked spark plug insulator and a suspected partially obstructed fuel injector on the problematic cylinder, likely causing a lean condition and detonation.
- Key lessons include reflexively pushing the mixture full rich in an engine emergency, always making a precautionary landing even after recovery, prioritizing the nearest airport, and the critical importance of engine monitors and moving-map displays.
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