# SDR COEA2019082072810

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 17, 2019
- Submitted: September 5, 2019
- Operation: Air carrier
- Aircraft: N810HC
- Make and model: Aerosp ATR 72-212
- Registry model: [Aerosp ATR 72-212](https://openairdocs.org/model/aerospatiale-atr-72-212) (OpenAirDocs)
- Aircraft serial: 423
- Aircraft time: 27,664 hours, 30,129 cycles
- System (JASC): [6120 · Propeller Controlling System](https://openairdocs.org/jasc/6120)
- Part: Control Unit
- Part number: 8088777
- Part serial: 940752
- Condition: Faulted
- Location: Nr 1 Propeller
- Stage of operation: CR
- How discovered: O
- Nature of condition: R
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/COEA2019082072810

## Discrepancy

FLIGHT 1701, ENROUTE,  AT 16,000 FT, THE NR 1 ENGINE TORQUE DROPPED FROM 70% TO 20% THEN RECOVERED. ALL OTHER PARAMETERS NORMAL.   AFTER EXTENSIVE TROUBLESHOOTING, MAINTENANCE REPLACED THE NR 1 PROP CONTROL UNIT. ALL OPS & LEAKS CHECKS GOOD.

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