# SDR DALA1215396305

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 11, 2012
- Submitted: March 13, 2012
- Operation: Air carrier
- Aircraft: [N665US](https://openairdocs.org/aircraft/N665US), registered now
- Make and model: Boeing 747451
- Aircraft serial: 23820
- Aircraft time: 96,001 hours, 11,953 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Battery Pack
- Condition: Discharged
- Location: Cabin
- 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/DALA1215396305

## Discrepancy

DURING A MAINTENANCE VISIT, THE CEILING EMERGENCY LIGHTS ON THE LEFT AND RIGHT SIDE FROM ROWS 22 TO 31 WERE FOUND TO BE INOPERATIVE.  MAINTENANCE FOUND PACK M7919 AT DOOR 3L CAUSING THE FAULT.  MAINTENANCE REPLACED THE POWER PACK AT 3L DOOR.  SYSTEM OPERATION WAS NORMAL AFTER THE POWER PACK WAS REPLACED.

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