# SDR DALA2016121609922

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 14, 2016
- Submitted: December 16, 2016
- Operation: Air carrier
- Aircraft: N667US
- Make and model: Boeing 747451
- Aircraft serial: 24222
- Aircraft time: 112,687 hours, 13,736 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Power Supply
- 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/DALA2016121609922

## Discrepancy

UPPER DECK CEILING EMERGENCY LIGHTS BETWEEN SEAT 73 WILL NOT TURN-OFF AFTER 20 SEC. REPLACED BATTERY-POWER SUPPLY AT M335. FUNCTIONAL CHECK OK AS PER B747-400 AMM 33-51. AFFECTED LTS STAY ON AFTER 20 SEC. (7856385)

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