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 exhibited 5 degrees of ignition timing slippage to an advanced position in 93 hours, highlighting an ongoing manufacturer issue.
• Various aircraft experienced critical component failures, including a cracked flap bellcrank bulkhead on a Cessna Cardinal, a completely cracked alternator bearing end cap on a Cirrus SR22, and severe corrosion on a Piper Aztec's main wheel assembly.
• Manufacturing defects were noted, with a possible factory oversight in flap bulkhead reinforcement on a Cessna Cardinal and newly supplied Piper PA-31t1 wing de-ice timers being mis-wired from the manufacturer.

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