# SDR AALA202408122116

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 9, 2024
- Submitted: August 12, 2024
- Operation: Air carrier
- Aircraft: [N556UW](https://openairdocs.org/aircraft/N556UW), registered now
- Make and model: Airbus A321-231
- Registry model: [Airbus A321-231](https://openairdocs.org/model/airbus-a321-231) (OpenAirDocs)
- Aircraft serial: 5244
- Aircraft time: 37,256 hours, 15,426 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Battery
- Condition: Inoperative
- Location: Zone 200
- 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/AALA202408122116

## Discrepancy

AIRCRAFT WAS NOT GROUNDED: DURING PS CHK EPSU TEST, FOUND BAT/EPSU (12WL) EXT R FAULT. REMOVED/REPLACED EPSU BATTERY ABOVE R3 EMERGENCY EXIT DOOR (12WL) IAW AMM 33-51-38, OPS CHECK GOOD, TESTS OK.

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