# SDR CALA2025052905084

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 28, 2025
- Submitted: May 29, 2025
- Operation: Air carrier
- Aircraft: [N45905](https://openairdocs.org/aircraft/N45905), registered now
- Make and model: Boeing 787-8
- Registry model: [Boeing 787-8](https://openairdocs.org/model/boeing-787-8) (OpenAirDocs)
- Aircraft serial: 34825
- Aircraft time: 47,883 hours, 5,941 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Control Unit
- Part number: 100260103
- Condition: Inoperative
- Location: Zone 200
- 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/CALA2025052905084

## Discrepancy

EXIT LOCATOR SIGN AT DOOR 4L INOP. REMOVED AND REPLACED DOOR 4L EXIT LOCATOR SIGN IAW AMM 33-51-01, NO HELP. NEW PART REMAINS INSTALLED. NOTED A LOAD FAULT ON THE WELS CONTROL UNIT 7, WHICH IS RESPONSIBLE FOR THIS LIGHT. REMOVED AND REPLACED WELS CONTROL UNIT 7 IAW AMM 33-51-07. OPS CHECK GOOD, LIGHT ILLUMINATES AND NO FAULTS ARE NOTED.

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