# SDR ASMF201602008

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 29, 2016
- Submitted: February 19, 2016
- Operation: Air carrier
- Aircraft: [N783AM](https://openairdocs.org/aircraft/N783AM), registered now
- Make and model: Boeing 787-8
- Registry model: [Boeing 787-8](https://openairdocs.org/model/boeing-787-8) (OpenAirDocs)
- Aircraft serial: 37167
- Aircraft time: 659 hours, 115 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Control Unit
- Part number: 100260103
- Part serial: 1152935
- Condition: Failed
- Location: Cabin
- Part time: 659 hours, 115 cycles
- Stage of operation: IN
- How discovered: O
- Nature of condition: J
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASMF201602008

## Discrepancy

DURING OVERNIGHT CHECK, THE EMER LIGHT FAILURE CODES 33-12106, 33-12107, 33-12120 & 33-12129 WERE SHOWN.  PERFORMED REVISION DETECTING THE ROWS 28 - 33 LIGHTS TURNED OFF & DURING THE APPLICATION OF TROUBLESHOOTING PROCEDURE, IT WAS DETECTED THAT CONTROL UNIT WCU-DR4 PRIMARY M3351008 NOT EFFECTED THE RELEASE OF THE EMER LIGHTS.  CONTROL UNIT WCU-DR4 PRIMARY M3351008 WAS REPLACED IAW DMC-B787-A-33-51-07-01A-A, TESTED CORRECT.

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