# SDR 2007FA0001070

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 1, 2007
- Submitted: December 7, 2007
- Operation: General aviation
- Aircraft: [N2472J](https://openairdocs.org/aircraft/N2472J), registered now
- Make and model: Cessna 172S
- Registry model: [Cessna 172S](https://openairdocs.org/model/cessna-172s) (OpenAirDocs)
- Aircraft serial: 172S10072
- Engine: Lyc IO360L2A
- Propeller: Mcauly 1A170E
- System (JASC): [2420 · AC Generation System](https://openairdocs.org/jasc/2420)
- Part: Control Unit
- Part number: AC2101
- Part serial: 037931C16111
- Condition: Failed
- Location: Alternator
- Part time: 215 hours
- Stage of operation: IN
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2007FA0001070

## Discrepancy

THE AIRCRAFT FACTORY INSTALLED ACU BEGAN FAILING AT 200 HOURS (INTERMITTENT ALTERNATOR DROPPING (OFF LINE) FOR A FEW SECONDS) (ON ONE OCCASION, THE FIELD CB DISENGAGED)  A NEW ACU WAS INSTALLED AT 215.9.  AT 246.1 THE SAME PROBLEM SURFACED, AND THE THIRD ACU WAS INSTALLED.  THE SERVICE CENTER HAS HAD THE SAME PROBLEM WITH OTHER AC.  (K)

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