# SDR AALA20190508001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 6, 2019
- Submitted: May 9, 2019
- Operation: Air carrier
- Aircraft: [N991AU](https://openairdocs.org/aircraft/N991AU), registered now
- Make and model: Airbus A321-231
- Registry model: [Airbus A321-231](https://openairdocs.org/model/airbus-a321-231) (OpenAirDocs)
- Aircraft serial: 7131
- Aircraft time: 8,605 hours, 3,284 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Battery
- Condition: Discharged
- Location: Cabin
- 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/AALA20190508001

## Discrepancy

AIRCRAFT WAS NOT GROUNDED: DURING PS CHECK OF THE EMERGENCY LIGHTS, FOUND FAULT BATTERY/EPSU (13WL) AFT LEFT. MAINTENANCE REPLACED BATTERY OF THE EPSU PER MM 33-51-38.

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