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 various mechanical failures observed across different aircraft engine components, including Bendix magnetos, Continental cylinders and lifters, ECI cylinder valve keys, Lycoming turbo mounts, and Kelly fuel pumps.
• Failures were discovered through diverse means, ranging from active engine roughness during pre-takeoff run-ups to routine annual and 500-hour inspections.
• Specific recurring issues highlighted include broken gear teeth in Bendix magnetos (averaging 1665.7 hours) and multiple instances of sheared drive shafts in Kelly fuel pumps (averaging a low 77.7 hours).

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