# SDR CALA2026062517324

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 14, 2026
- Submitted: June 25, 2026
- Operation: Air carrier
- Aircraft: [N13954](https://openairdocs.org/aircraft/N13954), registered now
- Make and model: Boeing 787-9
- Registry model: [Boeing 787-9](https://openairdocs.org/model/boeing-787-9) (OpenAirDocs)
- Aircraft serial: 36405
- Aircraft time: 52,513 hours, 5,032 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Battery
- Part number: AD100260201
- Part serial: AD24071279
- Condition: Faulted
- Location: Zone 200
- Part time: 8,930 hours, 864 cycles
- 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/CALA2026062517324

## Discrepancy

AHM DETECTED WELS MMSG {33-12102}  CLASS 02 - DOOR 1 RT REMOTE WELS CONTROL UNIT CONFIGURATION DOES NOT AGREE WITH OTHER WIRELESS EMERG LIGHTING SYS CONTROL UNITS* REF FIM DMC-B787-A-33-50-F1-M3A-421A-A TO CONFIRM FAULT. CON'T FAULT ISOLATION AS REQ'D. REF CONFIG DRAWING 2500DD15922 TO AID LOCATING WCU M3351002 AT DOOR 1R. CARRIED BY ELB FOUND CLASS 02 DR-1R WELS CONTROLLER INACTIVE, REPLACED BATTERY, OPS CHECK GOOD REF AMM DMC-B787-A-33-51-07-09A-921A-A.

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