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:

• Multiple aircraft experienced critical component failures, including advanced ignition timing in Slick magnetos (Cessna 172S), a cracked flap bellcrank bulkhead (Cessna 177RG), and a failed alternator bearing end cap (Cirrus SR22).
• Other significant findings involved severe corrosion in a Piper Aztec's main wheel assembly and manufacturing defects like mis-wired wing de-ice timers in new Piper Pa-31t1 parts.

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