# SDR AALA202503136919

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 13, 2025
- Submitted: March 13, 2025
- Operation: Air carrier
- Aircraft: [N913US](https://openairdocs.org/aircraft/N913US), registered now
- Make and model: Airbus A321-231
- Registry model: [Airbus A321-231](https://openairdocs.org/model/airbus-a321-231) (OpenAirDocs)
- Aircraft serial: 6255
- Aircraft time: 33,704 hours, 13,837 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Power Supply
- Part number: 32146210
- Part serial: 146672
- Condition: No Test
- Location: Zone 200
- Part time: 33,704 hours, 13,837 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/AALA202503136919

## Discrepancy

AIRCRAFT WAS NOT GROUNDED: DURING THE EMERGENCY POWER SUPPLY UNIT SYSTEM TEST A FAULT DISPLAYED FOR EMERGENCY POWER SUPPLY UNIT 10WL. MAINTENANCE REPLACED EMERGENCY POWER SUPPLY UNIT 10WL (AALA202503136919) AND THE BATTERY (AALA202503138731) PER AMM 33-51-38. A SATISFACTORY OPERATIONAL CHECK WAS ACCOMPLISHED WITH NO FAULTS NOTED.

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