# SDR AALA202607200068

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 15, 2026
- Submitted: July 20, 2026
- Operation: Air carrier
- Aircraft: [N157AA](https://openairdocs.org/aircraft/N157AA), registered now
- Make and model: Airbus A321-231
- Registry model: [Airbus A321-231](https://openairdocs.org/model/airbus-a321-231) (OpenAirDocs)
- Aircraft serial: 6998
- Aircraft time: 31,209 hours, 12,469 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Power Supply
- Part number: 32146210
- Part serial: 132963
- Condition: No Test
- Location: Zone 200
- Part time: 50,542 hours, 20,083 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/AALA202607200068

## Discrepancy

AIRCRAFT WAS GROUNDED: BATTERY FAULT FOR FWD L EPSU/BATT (10WL) DISPLAYED DURING SYSTEM TEST. MAINTENANCE REPLACED EMERGENCY POWER SUPPLY UNIT 10WL PER AMM 33-51-38 AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK WITH NO FAULTS NOTED,

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