Squawk Box

November 2008 Issue


The following information is derived from the FAA’s Service Difficulty Reports.

During the Cessna 172S’s first 100-hour inspection, a technician found both magnetos had slipped their timing approximately five degrees. The aircraft’s 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.

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