# SDR CALA2025100909860

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 6, 2025
- Submitted: October 9, 2025
- Operation: Air carrier
- Aircraft: [N45905](https://openairdocs.org/aircraft/N45905), registered now
- Make and model: Boeing 787-8
- Registry model: [Boeing 787-8](https://openairdocs.org/model/boeing-787-8) (OpenAirDocs)
- Aircraft serial: 34825
- Aircraft time: 49,368 hours, 6,122 cycles
- System (JASC): [2421 · AC Generator-Alternator](https://openairdocs.org/jasc/2421)
- Part: Gcu
- Part number: 7000053H02
- Part serial: AAEM000871
- Condition: Faulted
- Location: Zone 400
- Part time: 41,675 hours, 5,088 cycles
- Stage of operation: CR
- 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/CALA2025100909860

## Discrepancy

ELEC GEN OFF R2 ADVISORY R2 ENGINE DRIVEN GENERATOR IS OFFLINE. FIM  31-90-F8-01A-421B-A CMC MSG  2416693.  RIGHT 1 GENERATOR CONTROL UNIT GENERATOR CONTROL UNIT REPLACED REF AMM DMC-B787-A-24-22-02-01A-720A-A UPTO SECTION D SUB SECTION 5.   OPS CHECKED GOOD

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.