# SDR AALA202605114355

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 9, 2026
- Submitted: May 11, 2026
- Operation: Air carrier
- Aircraft: [N189UW](https://openairdocs.org/aircraft/N189UW), registered now
- Make and model: Airbus A321-211
- Registry model: [Airbus A321-211](https://openairdocs.org/model/airbus-a321-211) (OpenAirDocs)
- Aircraft serial: 1425
- Aircraft time: 79,219 hours, 30,758 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Cids
- Part number: Z010H000520A
- Part serial: 03338
- Condition: Faulted
- Location: Zone 200
- Part time: 81,552 hours, 32,899 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/AALA202605114355

## Discrepancy

AIRCRAFT WAS NOT GROUNDED: FAULT MESSAGE FOR MID RIGHT EMERGENCY POWER SUPPLY UNIT DISPLAYED DURING SYSTEM TEST. MAINTENANCE REPLACED THE FOLLOWING ITEMS:  #1 CIDS DIRECTOR PER AMM 23-73-34. (AALA202605104355), THE CABIN ASSIGNMENT MODULE PER AMM 23-73-19. (AALA202605113655) AND THE BATTERY FOR THE MID RIGHT EMERGENCY POWER SUPPLY UNIT PER AMM 33-51-38. (AALA202605119007) A SATISFACTORY OPERATIONAL CHECK OF THE EMERGENCY LIGHTING SYSTEM 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.