Nuts And Bolts

While changing an IO-520-BBs oil during an annual inspection, steel and red rubbery pieces were found in the filter. Metal determined to be coming from crankshaft gear driving alternator. Rubber was coming from alternator drive coupler. Four bolts holding crankshaft gear to crank were loose, allowing gear to slop around and cause wear of gears and coupler. Locking plates securing the four bolts were missing.

Key Takeaways:

• Various aircraft models experienced diverse critical component failures, affecting engine, structural, and control systems.
• Reported issues included loose or missing hardware, hidden corrosion, component fatigue, and electrical defects leading to operational problems.
• Many problems were discovered during routine maintenance or through pilot observation, highlighting the importance of thorough inspection to detect latent safety hazards.

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