# SDR DXTA2013030805311

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 7, 2013
- Submitted: March 11, 2013
- Operation: Air carrier
- Aircraft: [N990QS](https://openairdocs.org/aircraft/N990QS), registered now
- Make and model: Cessna 750
- Registry model: [Cessna 750](https://openairdocs.org/model/cessna-750) (OpenAirDocs)
- Aircraft serial: 7500190
- Aircraft time: 10,228 hours, 6,093 cycles
- System (JASC): [2720 · Rudder Control System](https://openairdocs.org/jasc/2720)
- Part: Unknown
- Condition: Malfunctioned
- Location: Yaw Damper
- 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/DXTA2013030805311

## Discrepancy

DURING CLIMBOUT,  CYAN YAW DAMPER FAIL UPPER A MESSAGE APPEARED.  PFD WAS SELECTED TO RT SIDE AND UPPER RUDDER B WAS ILLUMINATED.  MESSAGE STAYED ON FOR REMAINDER OF FLIGHT AND TAXI IN.  COULD NOT DUPLICATE DISCREPANCY ON GROUND.  PERFORMED YSAC SYS OPS CHECKS.  FOUND NORMAL.  CHECKED GROUNDS & RUDDER SURFACE POSITION SENSORS.  FOUND TO BE NORMAL. REPOSITIONED YSAC A&B.  PERFORMED YSAC SYSTEM TEST, ALL NORMAL.  WORK DONE IAW MM 27-24-01. OPS CHECKED NORMAL.

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