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:

• The reports detail a range of component failures, including loose engine bolts, structural corrosion in wing spars, cracked wheel hubs, and defective starters or bearings.
• These diverse mechanical and electrical issues affected critical systems across various aircraft models, highlighting potential safety and operational challenges.
• Many of the significant problems were identified during routine maintenance inspections, underscoring the crucial role of thorough checks in preventing serious in-flight incidents.

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