Squawk Box

November 2017 Issue

IO-520s

Beechcraft Model F33A Bonanza/IO-520 Cracked Magneto Impulse Coupling

During a 500-hour magneto inspection, the impulse coupling was discovered to have cracks in its flyweight base plate. The cracks were detected using magnetic particle inspection and appear to have originated from the sharp-cornered feature of the base plate that forms the full advance stop. Slick p/n M3050.

Part total time: 565.0 hours

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