Unbelievable Compressions - Savvy Aviation

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The FARs require a differential compression test to be performed at every annual inspection, but it's a really terrible test that is neither reliable (i.e., repeatable) nor a valid indiction of cylinder health. In this webinar, Mike Busch A&P/IA demonstrates its shortcomings, explains its pitfalls, and emphasizes why poor compression alone should never justify cylinder removal unless backed up by more trustworthy supporting evidence such as a borescope inspection.