# SDR QMLA2023022120009

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 17, 2023
- Submitted: February 21, 2023
- Operation: Air carrier
- Aircraft: [N772AL](https://openairdocs.org/aircraft/N772AL), registered now
- Make and model: Bell 407
- Registry model: [Bell 407](https://openairdocs.org/model/bell-helicopter-textron-canada-407) (OpenAirDocs)
- Aircraft serial: 53040
- Aircraft time: 11,123 hours, 44,407 cycles
- Engine: Allsn 250C47B
- Engine time: 5,161 hours, 11,683 cycles
- System (JASC): [7300 · Engine Fuel and Control](https://openairdocs.org/jasc/7300)
- Part: Hmu
- Part number: 23078029
- Part serial: JGALM0141
- Condition: Unknown
- Location: Metering Valve
- Part time: 7,436 hours
- Stage of operation: TO
- How discovered: C
- Nature of condition: J
- Precautionary procedure: C
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/QMLA2023022120009

## Discrepancy

THIS WAS THE THIRD TIME IN ONE-WEEK FADEC DEGRADE/RESTART FAULT WAS DISPLAYED ON THE CAUTION WARNING PANEL DURING RUN UP. AFTER CONNECTING TO THE ECU WITH A COMPUTER, FAULTS WFMVFLT AND WFMVRTFLT WERE FOUND, THESE SAME FAULTS WERE FOUND ON THE PREVIOUS INCIDENTS. AFTER PERFORMING PISTON PARKING PROCEDURE, CLEARING FAULTS AND PERFORMING SOME TROUBLESHOOTING I SPOKE WITH ROLLS ROYCE REP. GREG HOUSTON, WHO ADVISED REPLACING THE HMU.

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