# SDR AALA202408190618

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 18, 2024
- Submitted: August 19, 2024
- Operation: Air carrier
- Aircraft: [N542UW](https://openairdocs.org/aircraft/N542UW), registered now
- Make and model: Airbus A321-231
- Registry model: [Airbus A321-231](https://openairdocs.org/model/airbus-a321-231) (OpenAirDocs)
- Aircraft serial: 4134
- Aircraft time: 49,022 hours, 18,753 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Power Supply
- Part number: 32146210
- Part serial: 133487
- Condition: Faulty
- Location: Zone 200
- Part time: 49,081 hours, 18,777 cycles
- 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/AALA202408190618

## Discrepancy

AIRCRAFT WAS NOT GROUNDED: DURING PS CHECK EPSU SYSTEM TEST BATTERY/EPSU (15WL) MIDDLE LEFT FAULT. REPLACED EPSU 15WL.

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