# SDR DALA2020080302700

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 2, 2020
- Submitted: August 3, 2020
- Operation: Air carrier
- Aircraft: [N507DN](https://openairdocs.org/aircraft/N507DN), registered now
- Make and model: Airbus A350-941
- Registry model: [Airbus A350-941](https://openairdocs.org/model/airbus-a350-941) (OpenAirDocs)
- Aircraft serial: 0182
- Aircraft time: 11,314 hours, 991 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Power Supply
- Condition: Failed
- Location: Emergency Lights
- Stage of operation: IN
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DALA2020080302700

## Discrepancy

DISPATCH MSG CABIN EMER EXIT LT. COMPLIED WITH MX DIRECTION PER ACARS. CORRECTIVE ACTION: FAULTING EPSU NIS ATL. PERFORMED EPSU BITE PER A350 AMM 33-51 TEST FAULTS EPSU FIN 101WL1 AND 101WL4 REMOVED AND REPLACED 101WL1 PER A350 33-51OPS TEST NORMAL STILL FAULTS L4 REMOVED AND REPLACED EPSU 101WL4PER AMM 33-51 OPS GOOD VERIFIED SOFTWARE BITES PASS. (7033260)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.