# SDR GTIA2025042238876

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 12, 2025
- Submitted: April 22, 2025
- Operation: Air carrier
- Aircraft: [N668NK](https://openairdocs.org/aircraft/N668NK), registered now
- Make and model: Airbus A321-231
- Registry model: [Airbus A321-231](https://openairdocs.org/model/airbus-a321-231) (OpenAirDocs)
- Aircraft serial: 7135
- Aircraft time: 29,801 hours, 13,257 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Epsu
- Part number: 32146210
- Part serial: 152157
- Condition: Faulted
- Location: Zone 200
- Part time: 29,802 hours, 13,257 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/GTIA2025042238876

## Discrepancy

DURING EPSU BITE CHECK 13WL EPSU UNIT FAULT.-R/R EPSU

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