# SDR 2004UALA00753

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 27, 2004
- Submitted: August 17, 2004
- Operation: Air carrier
- Aircraft: [N121UA](https://openairdocs.org/aircraft/N121UA), registered now
- Make and model: Boeing 747422
- Aircraft serial: 29167
- Aircraft time: 22,033 hours, 2,737 cycles
- Engine: Pwa PW4056
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Light
- Condition: Inoperative
- 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/2004UALA00753

## Discrepancy

ZONE-E CEILING EMERGENCY LIGHTS OUT ON BOTH SIDE OF CABIN AISLE. REPLACED BATTERY AND POWER SUPPLY.

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