# SDR DALA2018020100027

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 1, 2018
- Submitted: February 2, 2018
- Operation: Air carrier
- Aircraft: [N856NW](https://openairdocs.org/aircraft/N856NW), registered now
- Make and model: Airbus A330-223
- Registry model: [Airbus A330-223](https://openairdocs.org/model/airbus-a330-223) (OpenAirDocs)
- Aircraft serial: 0631
- Aircraft time: 57,470 hours, 7,289 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Power Supply
- Condition: No Test
- Location: Emergency Lights
- 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/DALA2018020100027

## Discrepancy

EPSU SYSTEM TEST FAILED.   RESET EPUS AND REPLACED EPSU BATTERY 16WL.

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