# SDR UIEA2017042900674

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 28, 2017
- Submitted: May 1, 2017
- Operation: Air carrier
- Aircraft: [N419MC](https://openairdocs.org/aircraft/N419MC), registered now
- Make and model: Boeing 747-48EF
- Registry model: [Boeing 747-48EF](https://openairdocs.org/model/boeing-747-48ef) (OpenAirDocs)
- Aircraft serial: 28367
- Aircraft time: 88,485 hours, 15,277 cycles
- System (JASC): [2423 · Phase Adapter](https://openairdocs.org/jasc/2423)
- Part: Control Unit
- Part number: 746013J
- Part serial: 1263
- Condition: Failed
- Location: Nr 1
- Stage of operation: TO
- How discovered: O
- Nature of condition: G, J
- Precautionary procedure: C
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UIEA2017042900674

## Discrepancy

DURING TAKEOFF ROLL AT 70 KNOTS,  A MASTER CAUTION WARNING WITH ELEC UTILITY BUSS LT AND LT FUEL PRESSURE CTR.  THE NR 1 BCU WAS REPLACED AND BCU BACK PLATE INSPECTED IAW AMM 24-23-01, BCU CMC GROUND TEST PASSED.

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