# SDR COEA2016122038921

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 20, 2016
- Submitted: January 4, 2017
- Operation: Air carrier
- Aircraft: [N921FX](https://openairdocs.org/aircraft/N921FX), registered now
- Make and model: Aerosp ATR 42-300
- Registry model: [Aerosp ATR 42-300](https://openairdocs.org/model/aerospatiale-aeritalia-atr-42-300) (OpenAirDocs)
- Aircraft serial: 319
- Aircraft time: 26,740 hours, 30,673 cycles
- System (JASC): [7320 · Fuel Controlling System](https://openairdocs.org/jasc/7320)
- Part: Hmu
- Part number: 78639215
- Part serial: F2760
- Condition: Malfunctioned
- Location: Nr 1 Engine
- Stage of operation: CL
- How discovered: O
- Nature of condition: G
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/COEA2016122038921

## Discrepancy

DURING CLIMB OUT, THE NR 1 ENGINE PARAMETERS SURGED, NR 1 TORQUE INDICATOR NO LONGER FUNCTIONED AND MAIN BATTER CHARGE FAULT. FURTHER MAINTENANCE REPLACED THE NR 1 HMU AND PERFORMED ENGINE GROUND RUN PERFORMANCE CHECK ON NR 1 AND NR 2 ENGINES. PERFORMANCE CHECK GOOD ON BOTH ENGINES.

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