# SDR 99UAL900114

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 18, 1999
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: [N812UA](https://openairdocs.org/aircraft/N812UA), registered now
- Make and model: Airbus A319-131
- Registry model: [Airbus A319-131](https://openairdocs.org/model/airbus-industrie-a319-131) (OpenAirDocs)
- Aircraft serial: 850
- Engine: Iae V2522A5
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Power Supply
- Part number: 321454
- Condition: Inoperative
- Location: Cabin
- Component: 321430
- Stage of operation: IN
- Nature of condition: L
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/99UAL900114

## Discrepancy

EMERGENCY LIGHTS TEST SHOWS EPSU COMM FWD L AND EPSU COMM EMER R, L.  COMMUNICATION FAULT OCCURED BETWEEN EPSU'S (FWD L - 10WL, EMER R - 12WL AND EMER L - 11WL) AND CIDS.  ALL THESE EPSU'S AND THEIR BATTERIES WERE REPLACED, AND SUBSEQUENT EMERGENCY LIGHT TEST WAS FOUND NORMAL.  EPSU S/N REPLACED ARE AS FOLLOWS:2434, 6019, AND 6315.

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