# SDR AALA202101089015

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 8, 2021
- Submitted: January 9, 2021
- Operation: Air carrier
- Aircraft: [N833AA](https://openairdocs.org/aircraft/N833AA), registered now
- Make and model: Boeing 787-9
- Registry model: [Boeing 787-9](https://openairdocs.org/model/boeing-787-9) (OpenAirDocs)
- Aircraft serial: 40645
- Aircraft time: 11,966 hours, 1,302 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Battery
- Part number: 100260201
- Part serial: ST20055574
- Condition: Failed
- Location: Wels Unit
- 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/AALA202101089015

## Discrepancy

AIRCRAFT IN BASE MAINTENANCE.  WELS BATTERY UNIT CLASS 11 ABOVE SEAT 7H FAILED GROUND TEST.  REPLACED WBU, IAW AMM 33-51-07.  OPERATIONS CHECK GOOD.

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