# SDR AALA202606224414

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 19, 2026
- Submitted: June 22, 2026
- Operation: Air carrier
- Aircraft: [N412UW](https://openairdocs.org/aircraft/N412UW), registered now
- Make and model: Airbus A321-253NX
- Registry model: [Airbus A321-253NX](https://openairdocs.org/model/airbus-a321-253nx) (OpenAirDocs)
- Aircraft serial: 9224
- Aircraft time: 22,701 hours, 6,213 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Battery
- Part number: AD321431
- Condition: No Test
- 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/AALA202606224414

## Discrepancy

AIRCRAFT WAS NOT GROUNDED: WHILE PERFORMING EPSU SYSTEM TEST SOME EMERGENCY LIGHTS CONTINUE TO STAY ON AFTER TEST IS ACCOMPLISHED. MAINTENANCE REPLACED L2 EPSU BATTERY WITH A SERVICEABLE-UNIT IAW AMM 33-51-38.

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