# SDR F3LA202605160413

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 15, 2026
- Submitted: May 17, 2026
- Operation: Air carrier
- Aircraft: [N373FR](https://openairdocs.org/aircraft/N373FR), registered now
- Make and model: Airbus A320-251N
- Registry model: [Airbus A320-251N](https://openairdocs.org/model/airbus-a320-251n) (OpenAirDocs)
- Aircraft serial: 10451
- Aircraft time: 16,687 hours, 7,923 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Power Supply
- Part number: D30665709
- Part serial: M20631
- Condition: Faulted
- Location: Zone 200
- Part time: 18,746 hours, 8,625 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/F3LA202605160413

## Discrepancy

DURING HEAVY CHECK EPSU TEST FOUND AFT EPSU (13WL) FAULTING FOR INTERIOR AND EXTERIOR LIGHTS. AIRCRAFT WAS GROUNDED.   REMOVED AND REPLACED R4 DOOR SLIDE IAW AMM 25-62-44-400-803-A. OPS TEST GOOD. RE-TESTED EPSU BATTERY TEST IAW AMM 33-51-38-400-002-A. OPS TEST GOOD. NO FURTHER FAULTS DETECTED.  AIRCRAFT WAS RETURNED TO SERVICE.

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