Slippage

During the Cessna 172Ss first 100-hour inspection, a technician found both magnetos had slipped their timing approximately five degrees. The aircrafts magneto-to-engine timing was checked shortly after delivery, at 4.3 hours. Orange putty on the magneto hold-down studs was noted. It appears the magnetos have drifted significantly to the advanced position in 93 hours. This has been an ongoing issue with the engine and magneto manufacturers; SB2-08 does not address an advanced timing condition as in this case.

Key Takeaways:

• Slick 4371 magnetos on a Cessna 172S experienced significant ignition timing slippage (advancing 5 degrees in 93 hours), noted as an ongoing and unaddressed issue.
• Structural integrity and corrosion issues were found, including a cracked flap bellcrank bulkhead on a Cessna 177RG (potentially due to a missing factory reinforcement) and a severely corroded main wheel assembly on a Piper PA-23-250 Aztec.
• Component failures included a completely cracked alternator bearing end cap on a Cirrus SR22 and newly manufactured, mis-wired wing de-ice timers on a Piper Pa-31t1.

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