# SDR AALA202512059023

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 4, 2025
- Submitted: December 6, 2025
- Operation: Air carrier
- Aircraft: [N825AA](https://openairdocs.org/aircraft/N825AA), registered now
- Make and model: Boeing 787-9
- Registry model: [Boeing 787-9](https://openairdocs.org/model/boeing-787-9) (OpenAirDocs)
- Aircraft serial: 40644
- Aircraft time: 33,956 hours, 4,015 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Battery Pack
- Part number: 100260201
- Condition: No Test
- 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/AALA202512059023

## Discrepancy

AIRCRAFT WAS GROUNDED: EMERGENCY AISLE FLOOR PATH LIGHTING REMAINS ILLUMINATED FROM ROWS 24 TO 30. FOUND WCU 27 INOPERATIVE CORRELATED WITH MMSG 33-12127. ACCOMPLISHED FIM 33-50-F1-P0A-421A. REMOVE AND REPLACED WCU (AALA202512058858) AND WBU (AALA202512059023). PER AMM 33-51-07, TEST PASSED.

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