# SDR IPXA2014011001275

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 8, 2014
- Submitted: January 10, 2014
- Operation: Air carrier
- Aircraft: [N402UP](https://openairdocs.org/aircraft/N402UP), registered now
- Make and model: Boeing 757-24APF
- Registry model: [Boeing 757-24APF](https://openairdocs.org/model/boeing-757-24apf) (OpenAirDocs)
- Aircraft serial: 23724
- System (JASC): [2220 · Speed-Attitude Correction System](https://openairdocs.org/jasc/2220)
- Part: Yaw Damper
- Condition: Faulted
- Location: Left
- Stage of operation: CR
- How discovered: O
- Nature of condition: F, J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/IPXA2014011001275

## Discrepancy

ACFT SUDDENLY STARTED TO YAW SHARPLY, BOTH LT & RT BALL DEFLECTED FULL SCALE IN SLIP INDICATOR.  DESCENT TO FL300 & SPEED REDUCTION TO .78 MACH, TURNING OFF AUTOPILOT HELPED.  YAWING STOPPED.  TROUBLESHOT IAW FIM 22-21-00.  FOUND LT YAW DAMPER SYSTEM FAULTED.  LVDT FAULT BALL ON YAW DAMPER MODULE.  LEFT YAW DAMPER SERVO REMOVED IAW AMM 22-21-02-024-057.  GVI OF AIRFRAME & HARDWARE. NO DEFECTS NOTED.  INSTALLED LT YAW DAMPER IAW MM 22-21-02-424-017.  EFF SOURCE IPC 22-21-02-01, ITEM 010.

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