Piston Problems

During oil and filter change, chips and large metal pieces were found. During an annual inspection, the engine oil quick drain valve was blocked with debris. About a dozen pieces of what appeared to be piston ring pieces were removed. While performing a condition inspection, a crack was found on #6 intake. After takeoff, the crew noted engine vibration and lack of power. Inspection revealed excessive oil in the engine area and on the aircraft belly. After a precautionary landing due to power loss, a compression check showed zero on cylinder A4.

Key Takeaways:

• Piston skirt failures are a recurring issue in various aircraft engines, often resulting in severe internal damage and metal contamination of the oil system.
• Piston ring problems, including seizing, sticking, or breaking, are also common, leading to symptoms like compression loss, excessive oil consumption, engine vibration, or power loss.
• These piston-related failures were observed across different engine models and operating hours, detected through routine maintenance (e.g., oil changes) or in-flight performance issues.

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