# SDR QMLA2020082020040

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 18, 2020
- Submitted: August 20, 2020
- Operation: Air carrier
- Aircraft: [N408LN](https://openairdocs.org/aircraft/N408LN), registered now
- Make and model: Bell 407
- Registry model: [Bell 407](https://openairdocs.org/model/bell-helicopter-textron-canada-407) (OpenAirDocs)
- Aircraft serial: 54433
- Aircraft time: 2,246 hours, 7,537 cycles
- Engine: Allsn 250C47B
- Engine time: 2,071 hours, 5,547 cycles
- System (JASC): [7320 · Fuel Controlling System](https://openairdocs.org/jasc/7320)
- Part: Hmu
- Part number: M25010151
- Part serial: JGALM1756
- Condition: Unserviceable
- Location: Engine
- Part time: 2,071 hours
- Component: Turbine Engine, Rroyce, C47B
- Component part number: 23063392
- Stage of operation: AA
- How discovered: O
- Nature of condition: R
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/QMLA2020082020040

## Discrepancy

AFTER ESTABLISHING CRUISE FLIGHT ON THE WAY TO A SCENE LOCATION AND NOT UTILIZING REMAINING POWER AVAILABLE PILOT PULLED MORE COLLECTIVE TO EXPEDITE EN-ROUTE TIME. ONCE REACHING APPROXIMATELY 85% TRQ, TRQ DROPPED WITHOUT PILOT MANIPULATION, OVERCORRECTED AND THEN SETTLED, CAUSING THE AIRCRAFT TO YAW.  HMU WAS TROUBLE SHOT AND FOUND TO BE FAULTY.

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