# SDR DALA2025122309350

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 22, 2025
- Submitted: December 23, 2025
- Operation: Air carrier
- Aircraft: [N335DN](https://openairdocs.org/aircraft/N335DN), registered now
- Make and model: Airbus A321-213
- Registry model: [Airbus A321-213](https://openairdocs.org/model/airbus-a321-213) (OpenAirDocs)
- Aircraft serial: 8036
- Aircraft time: 24,582 hours, 10,969 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Power Supply
- Condition: Inoperative
- Location: Zone 200
- 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/DALA2025122309350

## Discrepancy

DURING EMERGENCY LIGHTS TEST FOUND MULTIPLE LIGHTS INOP, AND FAULT MESSAGE EPSU (11WL) EMER L.   REPLACED EPSU PER REF A321 AMM 33-51-38. (LP 4396068)

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