# SDR UPS04443589

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 5, 2004
- Submitted: December 6, 2004
- Operation: Air carrier
- Aircraft: N520UP
- Make and model: Boeing 747 212B
- Registry model: [Boeing 747 212B](https://openairdocs.org/model/boeing-747-212b) (OpenAirDocs)
- Aircraft serial: 21943
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Module
- Part number: M335
- Condition: Inoperative
- Location: Emergency Light
- 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/UPS04443589

## Discrepancy

AFT 2 EMERGENCY LIGHT IN CEILING PASSENGER SEAT AREA COMES ON MOMENTARILY THEN GO OUT WHEN SWITCH PLACED IN ON POSITION.  REMOVED AND REPLACED POWER SUPPLY MODULE IAW MM 33-51-00 AND MM 33-57-04.  OPS CHECK GOOD.  EMERGENCY POWER SUPPLY INSTALLED STA 650.

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