# SDR CALA2025122312325

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 19, 2025
- Submitted: December 23, 2025
- Operation: Air carrier
- Aircraft: [N37518](https://openairdocs.org/aircraft/N37518), registered now
- Make and model: Boeing 737-9
- Registry model: [Boeing 737-9](https://openairdocs.org/model/boeing-737-9) (OpenAirDocs)
- Aircraft serial: 64495
- Aircraft time: 16,679 hours, 5,518 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Fuse
- Part number: B21506
- Condition: Blown
- Location: Zone 200
- 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/CALA2025122312325

## Discrepancy

DURING EMERGENCY LIGHTS OPS CHECK,  BUSINESS CLASS FLOOR PROXIMITY LIGHTS INOPERATIVE.  REPLACED THE POWER SUPPLY FUSES AT M2816 IAW AMM 33-51-06, OPS CHECKED NORMAL ACFT OK TO CONTINUE

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