# SDR AALA202609147297

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 11, 2026
- Submitted: September 15, 2026
- Operation: Air carrier
- Aircraft: [N834AA](https://openairdocs.org/aircraft/N834AA), registered now
- Make and model: Boeing 787-9
- Registry model: [Boeing 787-9](https://openairdocs.org/model/boeing-787-9) (OpenAirDocs)
- Aircraft serial: 40653
- Aircraft time: 32,043 hours, 3,794 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Controller
- Part number: 100260103
- Condition: Inoperative
- Location: Zone 200
- Stage of operation: IN
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202609147297

## Discrepancy

AIRCRAFT IN BASE MAINTENANCE:  MAINTENANCE MESSAGE 33-11723 OCCURRED DURING GROUND TEST.  LT AND RT AFT CENTER AREA BUSINESS CLASS SEAT EMERGENCY LIGHTS EFFECTED.  REMOVED AND REPLACED WELS CONTROL UNIT IAW AMM 33-51-07, CLEANED CONNECTOR AT WCU 23 AND CLEANED CONTACTS BETWEEN WCU 23 AND WBU 23 IAW SWPM 20-60-01.  SOFTWARE LOADED TO WCU 23 AND WBU 23 IAW AMM 33-51-07. FAULT CLEARED.

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