# SDR AALA201805239034

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 19, 2018
- Submitted: May 24, 2018
- Operation: Air carrier
- Aircraft: [N158AN](https://openairdocs.org/aircraft/N158AN), registered now
- Make and model: Airbus A321-231
- Registry model: [Airbus A321-231](https://openairdocs.org/model/airbus-a321-231) (OpenAirDocs)
- Aircraft serial: 7009
- Aircraft time: 6,935 hours, 2,687 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Power Supply
- Condition: Faulty
- Location: Cabin
- Stage of operation: IN
- How discovered: C
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA201805239034

## Discrepancy

THE AIRCRAFT WAS GROUNDED. DURING PS CHECK, CIDS 1 FAIL, EPSU 15WL MID L, FAULT. REMOVED AND REPLACED EPSU EMERGENCY POWER SUPPLY UNIT PER AMM 33-51-38-401. CIDS 1 PASSED. OPERATIONS CHECK GOOD. REPLACED 15WL MID L IN CEILING ABOVE L2 DOOR.

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