# SDR RTE2010F00001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 1, 2010
- Submitted: September 17, 2010
- Operation: Air carrier
- Aircraft: [N4879F](https://openairdocs.org/aircraft/N4879F), registered now
- Make and model: Cessna U206A
- Registry model: [Cessna U206A](https://openairdocs.org/model/cessna-u206a) (OpenAirDocs)
- Aircraft serial: U2060579
- Engine: Cont IO520A
- System (JASC): [7414 · Magneto/Distributor](https://openairdocs.org/jasc/7414)
- Part: Contact Breaker
- Part number: M30B1
- Condition: Inoperative
- Location: Magneto
- Part time: 95 hours
- Component: Magneto, Slick
- Component part number: 6310
- Stage of operation: IN
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/RTE2010F00001

## Discrepancy

IT IS APPARENT THAT MFG MAGNETOS HAVE HAD THE CONTACT BREAKER ASSY REPLACED IAW SB2-06A, DATED 7/1/06 ARE EXPERIENCING RAPID INTERNAL TIMING CHANGES.  THE CONDITION NOTED ON NUMEROUS ACFT EQUIPPED WITH 4300 AND 6300 SERIES MAGNETOS IS ALWAYS A TIMING ADVANCE OF 2 TO 4 DEGREES AT INTERVALS OF 100 HRS OR LESS.  BESIDES THE ADDED EXPENSE OF RESETTING INTERNAL TIMING AT UNUSUALLY FREQUENT INTERVALS, THERE IS A REAL RISK OF SERIOUS ENGINE DAMAGE OCCURRING FROM ADVANCED TIMING OPERATION.  IAW SEVER PHONE CONVERSATIONS , OWNER OF ACFT MAGNETO SERVICE.  THERE ARE NUMEROUS OTHER OPERATORS EXPERIENCING THE SAME CONDITION.

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