# SDR CALA2024022300512

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 19, 2024
- Submitted: February 23, 2024
- Operation: Air carrier
- Aircraft: [N27901](https://openairdocs.org/aircraft/N27901), registered now
- Make and model: Boeing 787-8
- Registry model: [Boeing 787-8](https://openairdocs.org/model/boeing-787-8) (OpenAirDocs)
- Aircraft serial: 34821
- Aircraft time: 43,289 hours, 5,361 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Controller
- Part number: 100260103
- Condition: Malfunctioned
- Location: Seat 39d
- 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/CALA2024022300512

## Discrepancy

PLEASE CHECK FOR WELS FAULT M3351WG04 WCU CLASS26 LOCATED UNDER SEAT 39D REFER HAECO NON-ROUTINE NO.9478972,  PERFORMED THE TROUBLE SHOOTING AND WIRI. NG CHECK FOUND THE WCU FAILED REPLACED THE WCU AND CARRIED OUT I NSTALLATION TEST THE TEST RESULT FOUND NORMAL AS PER AMM 33-51-0 7-01A-520/720A-A REV.181 FIM 33-50-F1-E7A-421A-A REV.162

---
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.