# SDR CALA2025081907938

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 17, 2025
- Submitted: August 19, 2025
- Operation: Air carrier
- Aircraft: [N28987](https://openairdocs.org/aircraft/N28987), registered now
- Make and model: Boeing 787-9
- Registry model: [Boeing 787-9](https://openairdocs.org/model/boeing-787-9) (OpenAirDocs)
- Aircraft serial: 66146
- Aircraft time: 21,941 hours, 2,119 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Control Unit
- Condition: Faulted
- 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/CALA2025081907938

## Discrepancy

DURING OPS CHK FOR EMERGENCY LIGHT, FOUND NO FLOOR PROXIMITY LIGHTS COME ON SEAT 11D, 12D, 11F, 12F. REMOVED AND REPLACED WELS CONTROL UNIT (WCU 24) IAW AMM A-33-51-07-01A-720A-A. REQUIRES SOFTWARE INSTALLATION STEP 1.D.

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