# SDR DALA2019111746734

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 13, 2019
- Submitted: November 17, 2019
- Operation: Air carrier
- Aircraft: [N349DX](https://openairdocs.org/aircraft/N349DX), registered now
- Make and model: Airbus A321-211
- Registry model: [Airbus A321-211](https://openairdocs.org/model/airbus-a321-211) (OpenAirDocs)
- Aircraft serial: 8233
- Aircraft time: 4,833 hours, 2,128 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/DALA2019111746734

## Discrepancy

WHILE PERFORMING SERVICE CHECK DOING EMERGENCY ESCAPE PATH LIGHTINING TEST THROUGH MCDU SYSTEM TEST PAGE FOUND 3 PAGES OF CLASS 1 FAULTS RELATING TO EPSU (13WL). AFT L, REPLACED EPSU (13WL) AND BATTERY

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