# SDR HCM2006F00000

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 31, 2006
- Submitted: April 21, 2006
- Operation: Air carrier
- Aircraft: [N11QC](https://openairdocs.org/aircraft/N11QC), registered now
- Make and model: Urocop EC 130 B4
- Registry model: [Urocop EC 130 B4](https://openairdocs.org/model/eurocopter-ec-130-b4) (OpenAirDocs)
- Aircraft serial: 3358
- Engine: Tmeca ARRIEL2B
- System (JASC): [7321 · Fuel Control/Turbine Engines](https://openairdocs.org/jasc/7321)
- Part: Hmu
- Part number: 0292928850
- Part serial: 225B
- Condition: Malfunctioned
- Location: Engine
- Stage of operation: NR
- 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/HCM2006F00000

## Discrepancy

AIRCRAFT MADE-AIRPORT PRECAUTIONARY LANDING DUE TO 3 MOMENTARY ENGINE SURGES ACCOMPANIED BY AN ASSOCIATED LOW NR WARNING HORN.  PILOT STATES LANDING WAS NORMAL, AND MADE THE LANDING FOR A PRECAUTIONARY SAFETY CHECK.  MAINTENANCE REPLACED SEVERAL COMPONENTS INCLUDING THE HMU, FADEC AND DEECU.  IT IS BELIEVED TO BE THE HMU WHICH CAUSED THE SURGE, HOWEVER, THIS IS NOT CONCLUSIVE.  SUBSEQUENT FLIGHTS AFTER THE COMPONENT CHANGES PROVED GOOD.  (K)

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