# SDR AALA202410149002

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 12, 2024
- Submitted: October 14, 2024
- Operation: Air carrier
- Aircraft: [N902AA](https://openairdocs.org/aircraft/N902AA), registered now
- Make and model: Airbus A321-231
- Registry model: [Airbus A321-231](https://openairdocs.org/model/airbus-a321-231) (OpenAirDocs)
- Aircraft serial: 7519
- Aircraft time: 22,576 hours, 9,000 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Battery
- Part number: 321431
- Part serial: 364321
- 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/AALA202410149002

## Discrepancy

AIRCRAFT WAS IN BASE MAINTENANCE: DURING PS CHECK FOUND EMERGENCY LIGHT INOPERATIVE FOR EMERGENCY POWER SUPPLY UNIT 11WL EXIT LEFT. REMOVED AND REPLACED BATTERY OF THE EMERGENCY POWER SUPPLY UNIT 11WL AND PERFORMED OPERATIONAL CHECK OF EMERGENCY POWER SUPPLY UNIT IAW A321 AMM 33-51-38-000/400-002-A.

---
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.