# SDR DALA2025102207748

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 19, 2025
- Submitted: October 22, 2025
- Operation: Air carrier
- Aircraft: [N523DN](https://openairdocs.org/aircraft/N523DN), registered now
- Make and model: Airbus A350-941
- Registry model: [Airbus A350-941](https://openairdocs.org/model/airbus-a350-941) (OpenAirDocs)
- Aircraft serial: 0677
- Aircraft time: 6,842 hours, 541 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Power Supply
- Condition: No Test
- Location: Zone 200
- Stage of operation: IN
- How discovered: C
- Nature of condition: L, J
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DALA2025102207748

## Discrepancy

EMERGENCY LIGHTS DISPATCH MSG. PERFORMED BITE OF EPSU, FAULTING POWER SUPPLIES UNITS 102WL3 AND 102WL4, R/R BOTH UNITS PER A350 AMM 33-51, TESTS OK, DISPATCH MSG CLEARED, OK FOR SVC. (LP# 7606668)

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