# SDR 4911905172008

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 17, 2008
- Submitted: May 20, 2008
- Operation: Air carrier
- Aircraft: [N557UH](https://openairdocs.org/aircraft/N557UH), registered now
- Make and model: Bell 430
- Registry model: [Bell 430](https://openairdocs.org/model/bell-430) (OpenAirDocs)
- Aircraft serial: 49119
- Engine: Allsn 250C40B
- System (JASC): [3413 · Rate of Climb Indicator](https://openairdocs.org/jasc/3413)
- Part: Vertical Gyro
- Part number: 060002600
- Part serial: 4044
- Condition: Faulty
- Location: Cockpit
- Stage of operation: CR
- How discovered: O
- Nature of condition: O
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/4911905172008

## Discrepancy

DURING CRUISE FLIGHT, PILOT FELT A VIBRATION IN THE AC FOLLOWED BY ATTITUDE EXCURSIONS IN THE PITCH AXIS. THIS OCCURRED OVER A PERIOD OF APPROXIMATELY (2) MINUTES AND FELT SIMILAR TO GOING OVER A SERIES OF SPEED BUMPS. THE PILOT ELECTED TO MAKE A PRECAUTIONARY LANDING AND NOTIFIED MAINTENANCE.  TROUBLESHOOTING INDICATES THE VERTICAL GYRO AT FAULT.

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