# SDR CA140602026

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 28, 2014
- Submitted: March 12, 2015
- Operation: General aviation
- Make and model: Bombdr DHC8400
- Aircraft time: 9,804 hours
- Engine: Pwc PW150A
- Propeller: Rotol CR4086123F17
- System (JASC): [2720 · Rudder Control System](https://openairdocs.org/jasc/2720)
- Part: Yaw Damper
- Condition: Malfunctioned
- Location: Rudder Control
- Stage of operation: CL
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CA140602026

## Discrepancy

(CAN) ON DEPARTURE JUST AFTER V1 THE ACFT PULLED ABRUPTLY TO THE LT, CORRECTED WITH RT RUDDER AS WE WERE JUST ABOUT TO ROTATE.  FLEW THE DEPARTURE IAW SOP.  RULED OUT A WIND GUST BECAUSE THE WIND WAS LIGHT AT THE TIME OF DEPARTURE.  CHECKED FOR FAULT CODES.  THE ONLY SCU FAULT WAS EHVS.  THE ONLY FCS FAULT WAS IFC FAILURE. BOTH FAULT CODES CLEARED. OPC OF ALL THE FLIGHT CONTROLS C/O, NFF.  GVI WALK AROUND C/O, NFF. FDR DATA RETRIEVED VIA THE QAR/FDM. FDR DATA ANALYZED, DATA SHOWED THAT THE RUDDER DID A 5 DEGREE MOVEMENT TO THE LT CAUSING THE VEER.  AGREED AT THE TIME THAT THE YAW DAMPER LIKELY CAUSED THIS UNCOMMANDED RUDDER MOVEMENT.  YAW DAMPER DEFERRED. ACFT WAS GROUNDED UNTIL THE YAW DAMPER COULD BE REPLACED.

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