# SDR SCNA20260908384

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 7, 2026
- Submitted: September 8, 2026
- Operation: Air carrier
- Aircraft: [N904SY](https://openairdocs.org/aircraft/N904SY), registered now
- Make and model: Boeing 737900
- Aircraft serial: 44425
- Aircraft time: 31,378 hours, 14,009 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Light
- 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/SCNA20260908384

## Discrepancy

22DEF AND 23 DEF SIDEWALL LIGHT WILL NOT TURN ON ( CABIN INTERIOR ILLUMINATION - WITH GUIDES U PHOTOLUMINESCENT EMERGENCY ESCAPE PATH MARKING SYSTEM INSTALLED. REMOVED AND REPLACED 22DEF WINDOW LIGHT REF AMM 33-21-51 OPS CHECK GOOD

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