# SDR DALA13070706303

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 21, 2013
- Submitted: December 22, 2013
- Operation: Air carrier
- Aircraft: N663US
- Make and model: Boeing 747451
- Aircraft serial: 23818
- Aircraft time: 102,537 hours, 13,291 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: C
- Nature of condition: L
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DALA13070706303

## Discrepancy

DURING SERVICE CHECK ON EMERGENCY LIGHT, FOUND 75A FORWARD HAD NO ILLUMINATION.  REMOVED OVERHEAD PANEL AT 73A, TROUBLESHOT AND FOUND BATTERY BAD.  REPLACED POWER SUPPLY IAW AMM 33-51.  OPS CHECKED GOOD.

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