# SDR F3LA202603200386

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 20, 2026
- Submitted: March 20, 2026
- Operation: Air carrier
- Aircraft: [N378FR](https://openairdocs.org/aircraft/N378FR), registered now
- Make and model: Airbus A320-251N
- Registry model: [Airbus A320-251N](https://openairdocs.org/model/airbus-a320-251n) (OpenAirDocs)
- Aircraft serial: 10386
- Aircraft time: 15,621 hours, 7,442 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Power Supply
- Part number: 321431
- Condition: Failed
- 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/F3LA202603200386

## Discrepancy

REFERENCE LP702387 #2 EPSU BATTERY (10WL) FWD L FAILED TEST FAILED EPSU SYS TEST. AC WAS NOT GROUNDED AS A RESULT OF THIS SDR REPORTABLE EVENT, IT WAS A RON SCHEDULED HEAVY CHECK.  REMOVED AND REPLACED EPSU BATTERY (10WL) IAW AMM 33-51-38-000/400-002-A. OPS CHECK GOOD. AC OK FOR SERVICE.

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