# SDR DALA2020111203696

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 9, 2020
- Submitted: November 12, 2020
- Operation: Air carrier
- Aircraft: [N721TW](https://openairdocs.org/aircraft/N721TW), registered now
- Make and model: Boeing 757231
- Aircraft serial: 29954
- Aircraft time: 76,661 hours, 20,046 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Battery Pack
- Condition: Inoperative
- Location: Emergency Lights
- Stage of operation: IN
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DALA2020111203696

## Discrepancy

DURING WALK AROUND FOUND 1 SECTION OF EMERGENCY LIGHTS NOT WORKING.  CORRECTIVE ACTION: MAINTENANCE REPLACED THE BATTERY PACK.  SYSTEM OPERATION IS NORMAL.

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