# SDR F3LA202607210436

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 20, 2026
- Submitted: July 21, 2026
- Operation: Air carrier
- Aircraft: [N636FR](https://openairdocs.org/aircraft/N636FR), registered now
- Make and model: Airbus A321-271NX
- Registry model: [Airbus A321-271NX](https://openairdocs.org/model/airbus-s-a-s-a321-271nx) (OpenAirDocs)
- Aircraft serial: 11839
- Aircraft time: 7,244 hours, 3,350 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Power Supply
- Part number: 32146210
- Part serial: 184102
- Condition: No Test
- Location: Zone 200
- Part time: 7,244 hours, 3,350 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/F3LA202607210436

## Discrepancy

REFERENCE LP 672850 #1,  AIRCRAFT WAS NOT GROUNDED. DURING HEAVY CHECK FAILED 12WL EPSU UNIT FAULT ON ECAM AND UNIT FAULT.   REPLACED 12WL EPSU UNIT REF AMM 33-51-38-000-001-A & 33-51-400-001-A OPS CHECK GOOD. A/C OK FOR SERVICE.

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