# SDR AALA202410233137

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 21, 2024
- Submitted: October 23, 2024
- Operation: Air carrier
- Aircraft: [N812AA](https://openairdocs.org/aircraft/N812AA), registered now
- Make and model: Boeing 787-8
- Registry model: [Boeing 787-8](https://openairdocs.org/model/boeing-787-8) (OpenAirDocs)
- Aircraft serial: 40630
- Aircraft time: 32,919 hours, 4,467 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Power Supply
- Part number: 100260201
- Condition: Faulted
- Location: Zone 200
- Stage of operation: IN
- How discovered: C
- Nature of condition: L
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202410233137

## Discrepancy

AIRCRAFT WAS IN BASE MAINTENANCE: WELS CONTROL UNIT BATTERY POWER SHOWS MAINTENANCE MESSAGE 33-11301. MAINTENANCE REPLACED WELS CONTROL UNIT BATTERY AT DOOR 1L IAW B787 FIM DMC-B787-A-33-50-F1-46A-421A-A.

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