# SDR AALA202606085404

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 5, 2026
- Submitted: June 8, 2026
- Operation: Air carrier
- Aircraft: [N586UW](https://openairdocs.org/aircraft/N586UW), registered now
- Make and model: Airbus A321-231
- Registry model: [Airbus A321-231](https://openairdocs.org/model/airbus-a321-231) (OpenAirDocs)
- Aircraft serial: 6230
- Aircraft time: 37,928 hours, 15,513 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/AALA202606085404

## Discrepancy

AIRCRAFT WAS NOT GROUNDED: WHILE PERFORMING OPERATIONAL TEST OF THE EMERGENCY LIGHTS, MAINTENANCE FOUND CLASS 1 CODE ON MCDU SYSTEM REPORT PAGE. CODE STATES BAT/EPSU (11WL) EXT L. MAINTENANCE REPLACED THE BATTERY FOR EMERGENCY POWER SUPPLY UNIT 11WL AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK PER AMM 33-51-38

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