# SDR DALA2025121709197

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 17, 2025
- Submitted: December 17, 2025
- Operation: Air carrier
- Aircraft: [N550NW](https://openairdocs.org/aircraft/N550NW), registered now
- Make and model: Boeing 757251
- Aircraft serial: 26497
- Aircraft time: 63,791 hours, 27,468 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Battery Pack
- Condition: Inoperative
- 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/DALA2025121709197

## Discrepancy

DURING CHECK FOUND SECTION OF EMERGENCY LIGHTS INOP.   T/S ISSUE TO BATTERY PACK ON POWER SUPPLY M731. R/R BATTERY PACK IAW B757 AMM 33-51, OPS CHECK OK. (7716455)

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