# SDR DALA12003615525

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 16, 2012
- Submitted: July 17, 2012
- Operation: Air carrier
- Aircraft: [N525US](https://openairdocs.org/aircraft/N525US), registered now
- Make and model: Boeing 757251
- Aircraft serial: 23619
- Aircraft time: 71,719 hours, 30,446 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Battery Pack
- Condition: Inoperative
- Location: Emergency Light
- 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/DALA12003615525

## Discrepancy

DURING AN EMERGENCY LIGHTS TEST, MAINTENANCE DISCOVERED EMERGENCY LIGHTS IN ZONE 1 AND 4 FAILED.  REMOVED AND REPLACED BATTERY PACKS M730 AND M736 AND POWER SUPPLY M9004.  OPS CHECK GOOD.

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