# SDR AALA202604082017

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 1, 2026
- Submitted: April 8, 2026
- Operation: Air carrier
- Aircraft: [N434AN](https://openairdocs.org/aircraft/N434AN), registered now
- Make and model: Airbus A321-253NX
- Registry model: [Airbus A321-253NX](https://openairdocs.org/model/airbus-a321-253nx) (OpenAirDocs)
- Aircraft serial: 10513
- Aircraft time: 18,802 hours, 5,172 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Power Supply
- Part number: 32146210
- Part serial: 149041
- Condition: No Test
- Location: Zone 200
- Part time: 33,791 hours, 13,671 cycles
- 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/AALA202604082017

## Discrepancy

AIRCRAFT IN BASE MAINTENANCE: ROW 21 22 23 28 32 33 36 ISLE EMERGENCY LIGHTS INOPERATIVE: MAINTENANCE NOTED THAT THERE WAS A FAULT MESSAGE FOR EMERGENCY POWER SUPPLY UNIT 11WL WHEN ACCOMPLISHING THE SYSTEM TEST AND REPLACED IT PER AMM 33-51-00. A SATISFACTORY OPERATIONAL CHECK OF THE EMERGENCY LIGHTING SYTEM WAS ACCOMPLISHED WITH NO FAULTS 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.