# SDR AALA202602051360

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 2, 2026
- Submitted: February 5, 2026
- Operation: Air carrier
- Aircraft: [N836AA](https://openairdocs.org/aircraft/N836AA), registered now
- Make and model: Boeing 787-9
- Registry model: [Boeing 787-9](https://openairdocs.org/model/boeing-787-9) (OpenAirDocs)
- Aircraft serial: 40654
- Aircraft time: 31,259 hours, 3,761 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Control Unit
- Part number: 100260103
- Part serial: 1174447
- Condition: Failed
- Location: Zone 800
- 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/AALA202602051360

## Discrepancy

AIRCRAFT IN BASE MAINTENANCE: WELS CONTROL UNIT ON R4 DOOR IS FAILING. REMOVED AND REPLACED WELS CONTROL UNIT. PER 33-51-07.

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