# SDR ASAA2025101661634

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 16, 2025
- Submitted: October 17, 2025
- Operation: Air carrier
- Aircraft: [N972AK](https://openairdocs.org/aircraft/N972AK), registered now
- Make and model: Boeing 737-9
- Registry model: [Boeing 737-9](https://openairdocs.org/model/boeing-737-9) (OpenAirDocs)
- Aircraft serial: 43389
- Aircraft time: 13,408 hours, 3,854 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Power Supply
- Part number: D71702001
- Condition: Faulty
- Location: Zone 200
- Stage of operation: CL
- How discovered: V
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2025101661634

## Discrepancy

FA REPORTS EMERGENCY LIGHT ABOVE ROW 27 IS ILLUMINATED DURING CLIMB & CRUISE, LIGHT EXTINGUISHED DURING DESENT. GROUNDED - YES. REMOVED AND REPLACED BATTERY/ PWR PACK 3378 WDM 33-51-13 OPS NML AMM 33-51-06.

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