# SDR AALA202504257132

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 24, 2025
- Submitted: April 25, 2025
- Operation: Air carrier
- Aircraft: [N952XV](https://openairdocs.org/aircraft/N952XV), registered now
- Make and model: Airbus A321-253N
- Registry model: [Airbus A321-253N](https://openairdocs.org/model/airbus-a321-253n) (OpenAirDocs)
- Aircraft serial: 7861
- Aircraft time: 21,845 hours, 5,838 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Power Supply
- Part number: 32146210
- Part serial: 156825
- Condition: No Test
- Location: Zone 200
- Part time: 21,845 hours, 5,838 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/AALA202504257132

## Discrepancy

AIRCRAFT WAS NOT GROUNDED: DURING EMERGENCY POWER SUPPLY UNIT SYSTEM TEST THE FOLLOWING MESSAGES DISPLAYED: EXIT SIGNS/EPSU(11WL)EXT L , EXIT SIGNS/EPSU(13WL)AFT L, FPEEPMS CROSS AISLE LT/EPSU(13W)AFT L, EXIT SIGNS/EPSU(12WL)EXT R AND FPEEPMS CROSS AISLE LT/EPSU(12WL)EXT R OBSERVED. MAINTENANCE REPLACED EMERGENCY POWER SUPPLY UNIT 11WL PER AMM 33-51-38 AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK WITH NO FAULTS NOTED. ALL EMERGENCY POWER SUPPLY UNITS AND EMERGENCY LIGHTING PASSED THE FUNCTIONAL TEST WITH NO ISSUED NOTED.

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