# SDR AALA202501240058

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 23, 2025
- Submitted: January 24, 2025
- Operation: Air carrier
- Aircraft: [N426AN](https://openairdocs.org/aircraft/N426AN), registered now
- Make and model: Airbus A321-253NX
- Registry model: [Airbus A321-253NX](https://openairdocs.org/model/airbus-a321-253nx) (OpenAirDocs)
- Aircraft serial: 10195
- Aircraft time: 15,599 hours, 4,165 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Battery
- Part number: 321431
- Condition: Faulted
- Location: Zone 200
- Stage of operation: NR
- How discovered: O
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202501240058

## Discrepancy

AIRCRAFT WAS GROUNDED: A FAINT TRIPLE-BEEPING NOISE IS REGULARLY HEARD IN THE CABIN NEAR AND AFT OF THE OVERWING EXITS. MAINTENANCE FOUND BATTERY AT EMERGENCY POWER SUPPLY UNIT 12WL FAULTING. EMERGENCY POWER SUPPLY UNIT 12WL (AALA202501249077) AND THE BATTERY (AALA202501240058) PER AMM 33-51-38. A SATISFACTORY OPERATIONAL CHECK WAS ACCOMPLISHED WITH NO ISSUES OR NOISES NOTED.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.