Engines And Accessories

Two different Cirrus SR22 aircraft (powered by Continental IO-550-N27 engines) were discovered by the same shop to have broken magneto gear teeth. The first instance was discovered as a result of engine roughness during a pre-takeoff engine run-up: The l/h magneto was not firing properly and, upon inspection, the distributor gear (p/n: 10-357586) was found to be missing approximately ten teeth. The second instance was discovered during a routine 500-hour inspection. There was no pre-inspection indication of a problem with the magneto.

Key Takeaways:

• The article details multiple distinct failures observed in critical aircraft engine components and accessories from various manufacturers.
• Reported issues include broken magneto gear teeth, cracked cylinders, lifter spalling, failed valve keys, broken turbo mount brackets, and sheared fuel pump shafts.
• Failures are discovered through diverse means, ranging from operational issues like engine roughness to routine annual or 500-hour inspections.
• The time in service for failed components varies significantly, from very low hours (e.g., 77.7 hours for a fuel pump) to over 1600 hours for other parts.

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