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:

• Several aircraft models experienced critical component failures, including significant ignition timing slippage on Slick magnetos (Cessna 172S) and a cracked alternator bearing end cap (Cirrus SR22).
• Structural and assembly issues were identified, such as a cracked flap bellcrank bulkhead on a Cessna Cardinal 177RG (potentially due to a manufacturing oversight) and severe corrosion on a Piper Aztec's main wheel assembly.
• Manufacturing defects were also present, exemplified by new, mis-wired wing de-ice timers for a Piper Pa-31t1, causing immediate operational problems.

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