# SDR DALA1211726301

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 27, 2012
- Submitted: February 28, 2012
- Operation: Air carrier
- Aircraft: [N661US](https://openairdocs.org/aircraft/N661US), registered now
- Make and model: Boeing 747451
- Aircraft serial: 23719
- Aircraft time: 94,612 hours, 12,531 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Fuse
- Condition: Defective
- Location: Power Supply
- 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/DALA1211726301

## Discrepancy

DURING A MAINTENANCE VISIT, THE 2 LOWER EMERGENCY LIGHTS AT THE WING TRAILING EDGE WERE FOUND TO BE INOPERATIVE.  MAINTENANCE FOUND THE 3 FUSES DEFECTIVE IN THE POWER SUPPLY AND REPLACED THEM.  SYSTEM OPERATION WAS NORMAL AFTER THE FUSES WERE REPLACED.

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