# SDR DALA2021012500476

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 25, 2021
- Submitted: January 25, 2021
- Operation: Air carrier
- Aircraft: [N509DN](https://openairdocs.org/aircraft/N509DN), registered now
- Make and model: Airbus A350-941
- Registry model: [Airbus A350-941](https://openairdocs.org/model/airbus-a350-941) (OpenAirDocs)
- Aircraft serial: 0199
- Aircraft time: 12,455 hours, 1,131 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Cids
- Condition: Malfunctioned
- 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/DALA2021012500476

## Discrepancy

OVERHEAD EMERGENCY EXIT LIGHTS AT 3L/3R ILLUMINATED.  ALSO FLOOR LIGHTS ON F/O SIDE FROM 3R TO AFT.  CIDS RESET UNSUCCESSFUL.  CORRECTIVE ACTION: REPLACED POWER SUPPLY UNIT 102WL3, NO HELP.  REPLACED SPDB8 SLOT S (801XY).  REPLACED SPDB6 SLOT C(603XY), PER A350 AMM 24-74 FAULTS SOFTWARE CONFIG.   REPLACED PCB SPDB8 SLOT B.  CHECK OF PCB GOOD.  EMERGENCY LIGHT CHECK GOOD.

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