# SDR CALA2026051416254

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 14, 2026
- Submitted: May 14, 2026
- Operation: Air carrier
- Aircraft: [N29907](https://openairdocs.org/aircraft/N29907), registered now
- Make and model: Boeing 787-8
- Registry model: [Boeing 787-8](https://openairdocs.org/model/boeing-787-8) (OpenAirDocs)
- Aircraft serial: 34830
- Aircraft time: 52,204 hours, 6,379 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Control Unit
- Part number: AD100260201
- Part serial: 7967
- Condition: Faulty
- Location: Zone 200
- Part time: 1,470 hours, 176 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/CALA2026051416254

## Discrepancy

SAFA INSPECTION FOUND FLOOR PROXIMITY LIGHTNING AT SEATS 30, 31 AND 32 INOP ON BOTH SIDES. FULL EMERGENCY LIGHT GROUND TEST SHOWS FAULT 33-11624 LOCKED FOR MX FERRY SLAVED WCU 26 FROM SEAT 39D INTO WCU 24 POSITION AT SEAT 22D, NO JOY. INSTALLED WCU IN ORIGINAL POSITION. DMC-B787-A-33-51-07-01B-720A-A FOUND BROKEN WIRE AT SEAT 30 FLOOR PROXMITY LIGHT.REPAIRED THE WIRE BUT NO HELP.NEEDS MORE TROUBLESHOOTING.REF AMM 33-51-06. MATERIALS UPDATE UNLOCKING TROUBLESHOT SYSTEM REF FIM 33-50-F1-C5A-421A-A. REMOVED AND REPLACED WELS CONTROL UNIT BATTERY AT M3351WG04 REF AMM 33-51-07-02B-720A-A. PERFORMED SYSTEM VERIFICATION TEST REF AMM 33-51-00-07A-343A-A.

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