# SDR CALA2021100101731

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 29, 2021
- Submitted: October 1, 2021
- 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: 34,339 hours, 4,242 cycles
- System (JASC): [3300 · Lighting System](https://openairdocs.org/jasc/3300)
- Part: None
- Part number: 100260102
- Condition: None
- Location: Class 31
- Stage of operation: CR
- How discovered: O
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2021100101731

## Discrepancy

EXIT PATH LIGHTS ON SEAT S ILLUM BTWN DOORS 3 AND  4. FIM TASK DMC-B787-A-33-50-F1-S8A-421A-A ACTIONED. TEST FAULTED CLASS 31 WELS CTRL UNIT, WELS CTRL UNIT CLASS 31 REPLACED IAW AMM 33-51-07. DATABASE UPLOAD CARRIED OUT AND FULL EMERGENCY LIGHTS SYSTEM TEST PASSED. EMERGENCY LIGHTS VERIFIED TO OPERATE NORMALLY. ADD EMP:U168499,U332743 REF LP 7146882 SDR RAISED.

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