# SDR N3XR202610130001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 9, 2026
- Submitted: October 13, 2026
- Operation: General aviation
- Filed by: [Embry-Riddle Aeronautical University Inc, repair station N3XR816N](https://openairdocs.org/faa-repair-station/N3XR816N/embry-riddle-aeronautical-university-inc.md) (OpenAirDocs)
- Aircraft: [N923ER](https://openairdocs.org/aircraft/N923ER), registered now
- Make and model: Cessna 172S
- Registry model: [Cessna 172S](https://openairdocs.org/model/cessna-172s) (OpenAirDocs)
- Aircraft serial: 172S12979
- Aircraft time: 3,386 hours
- System (JASC): [2421 · AC Generator-Alternator](https://openairdocs.org/jasc/2421)
- Part: Control Unit
- Part number: AC2101
- Part serial: Y59830
- Condition: Burned
- Location: Alternator
- Part time: 3,386 hours
- Stage of operation: NR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/N3XR202610130001

## Discrepancy

THE ALTERNATOR CIRCUIT BREAKER POPPED AFTER A PREVIOUS RESET. THE ACU (ALTERNATOR CONTROL UNIT) P/N-AC2101, S/N-Y59830 FAILED. INSTALLED A NEW ACU, AND THE FUNCTION CHECK PASSED.

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