# SDR DALA2021020100614

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 31, 2021
- Submitted: February 2, 2021
- Operation: Air carrier
- Aircraft: [N504DN](https://openairdocs.org/aircraft/N504DN), registered now
- Make and model: Airbus A350-941
- Registry model: [Airbus A350-941](https://openairdocs.org/model/airbus-a350-941) (OpenAirDocs)
- Aircraft serial: 0160
- Aircraft time: 13,872 hours, 1,259 cycles
- System (JASC): [3397 · Light System Wiring](https://openairdocs.org/jasc/3397)
- Part: Circuit Board
- Condition: Failed
- Location: Emergency Lights
- Stage of operation: IN
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DALA2021020100614

## Discrepancy

SHIP 3504 CEILING LTS INOP AND EMERGENCY LTS ON 20AB-36ABC WHEN IN ARM POSITION.  CORRECTIVE ACTION: REPLACED 503XY, PCB, PER A350 AMM 24-74.  EMERGENCY LIGHTS AND CEILING LTS OPS NORMAL.

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