# SDR USAA20101122SB192

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 19, 2010
- Submitted: November 22, 2010
- Operation: Air carrier
- Aircraft: [N441US](https://openairdocs.org/aircraft/N441US), registered now
- Make and model: Boeing 737-4B7
- Registry model: [Boeing 737-4B7](https://openairdocs.org/model/boeing-737-4b7) (OpenAirDocs)
- Aircraft serial: 24812
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Power Supply
- Part number: 20121
- 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/USAA20101122SB192

## Discrepancy

FLL - MAINTENANCE REPORTED THE EXTERIOR OVERWING EMERGENCY EXIT LIGHTS, FORWARD AND AFT OF EMERGENCY EXIT HATCHES LEFT SIDE, INOPERATIVE.  MAINTENANCE REMOVED AND REPLACED THE M1479 POWER SUPPLY IN ASSOCIATION WITH MM 33-51-51.  OPERATIONAL TEST OF EMERGENCY LIGHTS GOOD.

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