# SDR SIMA20240109001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 9, 2024
- Submitted: January 10, 2024
- Operation: Air carrier
- Aircraft: [N278NN](https://openairdocs.org/aircraft/N278NN), registered now
- Make and model: Emb ERJ 170-200 LR
- Registry model: [EMB ERJ 170-200 LR](https://openairdocs.org/model/embraer-s-a-erj-170-200-lr) (OpenAirDocs)
- Aircraft serial: 17000784
- Aircraft time: 11,989 hours, 7,829 cycles
- System (JASC): [2421 · AC Generator-Alternator](https://openairdocs.org/jasc/2421)
- Part: Gcu
- Part number: 1701321F
- Condition: Failed
- Location: Nr 1 Id
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/SIMA20240109001

## Discrepancy

DECLARED AN EMERGENCY. IDG 1 OFF BUS IN FLIGHT. RESET PROBLEM-C/A-RAR MAIN GENERATOR CONTROL UNIT GCU 1 IAW EMB 175 AMM 24-21-19. OPERATIONAL CHECK GOOD.

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