# SDR ACE020604

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 6, 2004
- Submitted: February 7, 2004
- Operation: Air carrier
- Aircraft: [N9957M](https://openairdocs.org/aircraft/N9957M), registered now
- Make and model: Cessna 207A
- Registry model: [Cessna 207A](https://openairdocs.org/model/cessna-207a) (OpenAirDocs)
- Aircraft serial: 20700764
- Aircraft time: 16,195 hours
- Engine: Cont IO520F
- Engine time: 7,886 hours
- System (JASC): [3420 · Attitude and Direction Data System](https://openairdocs.org/jasc/3420)
- Part: Gyro
- Condition: Spinning
- Location: Cockpit
- Stage of operation: CR
- 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/ACE020604

## Discrepancy

PILOT REPORTED THAT TWO AIR DRIVEN GYROS BEGAN SPINNING AND THE ENGINE RPM INCREASED TO ABOVE RED LINE.  WHEN UNABLE TO REDUCE RPM WITH PROP CONTROL, RETURNED TO THE AIRPORT.  GROUND CHECKS COULD NOT DUPLICATE THE RPM PROBLEM.

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