# SDR DALA2023053104357

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 29, 2023
- Submitted: May 31, 2023
- Operation: Air carrier
- Aircraft: [N851NW](https://openairdocs.org/aircraft/N851NW), registered now
- Make and model: Airbus A330-223
- Registry model: [Airbus A330-223](https://openairdocs.org/model/airbus-a330-223) (OpenAirDocs)
- Aircraft serial: 0609
- Aircraft time: 74,476 hours, 9,783 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Unknown
- Part number: UNKNOWN
- Condition: Unknown
- Location: Unknown
- Stage of operation: IN
- How discovered: O
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DALA2023053104357

## Discrepancy

SHIP 3351 DONT PASS OPERATIONAL TEST EPSU-EMERGENCY POWER SUPPLY UNIT POSITION 19WL IN PASSENGER CABIN. CORRECTIVE ACTION: REPLACED EPSU (19WL). (2789304)

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