# SDR KCSA2026090854

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 8, 2026
- Submitted: September 9, 2026
- Operation: Air carrier
- Aircraft: [N713CK](https://openairdocs.org/aircraft/N713CK), registered now
- Make and model: Boeing 747-4B5F
- Registry model: [Boeing 747-4B5F](https://openairdocs.org/model/boeing-747-4b5f) (OpenAirDocs)
- Aircraft serial: 32808
- Aircraft time: 89,867 hours, 15,745 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Battery
- Part number: 20131A
- Part serial: 51741
- Condition: Inoperative
- Location: Zone 200
- Part time: 70,323 hours, 10,370 cycles
- 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/KCSA2026090854

## Discrepancy

TWO EMERGENCY LIGHTS INOPERATIVE ON CEILING TOWARDS REAR OF CABIN AREA.   REMOVED & REPLACED BATTERY POWER SUPPLY, ALL CHECKS GOOD IAW AMM 33-51-04.

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