# SDR CALA2026100820224

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 7, 2026
- Submitted: October 8, 2026
- Operation: Air carrier
- Aircraft: [N12020](https://openairdocs.org/aircraft/N12020), registered now
- Make and model: Boeing 787-10
- Registry model: [Boeing 787-10](https://openairdocs.org/model/boeing-787-10) (OpenAirDocs)
- Aircraft serial: 66989
- Aircraft time: 17,639 hours, 2,156 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Battery
- Part number: AD100260201
- Condition: Inoperative
- Location: Emergency Lights
- 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/CALA2026100820224

## Discrepancy

ROWS 44-48 EMERGENCY LIGHTING INOPERATIVE.  FOUND A FAULT ON WCU 27.  FAULT CODE 6 LOAD FAULT. DURING OPS. FOUND THAT PART OF THE LIGHTS CONTROLED BY WCU 27 ARE ILLIMINATED. SUSPECT A SEAT TRACK.  REMOVED AND REPLACED THE ROW 49 POWER SEAT TRACK. NO FIX. REINSTALLED ORIGINAL. REMOVED AND REPLACED THE WCU 27 IAW AMM 33-51-07-01A. OPS CHKD GOOD.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.