# SDR WRNA201200006

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 11, 2012
- Submitted: May 14, 2012
- Operation: Air carrier
- Aircraft: [N821SC](https://openairdocs.org/aircraft/N821SC), registered now
- Make and model: Airbus A300 B4-203
- Registry model: [Airbus A300 B4-203](https://openairdocs.org/model/airbus-industrie-a300-b4-203) (OpenAirDocs)
- Aircraft serial: 211
- Aircraft time: 55,695 hours, 22,894 cycles
- System (JASC): [2220 · Speed-Attitude Correction System](https://openairdocs.org/jasc/2220)
- Part: Gyro
- Part number: J5BM2
- Part serial: 3071532E2
- Condition: Unserviceable
- Location: Autopilot Sys
- Stage of operation: CR
- 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/WRNA201200006

## Discrepancy

BOTH NR 1 & NR 2 YAW DAMPERS WOULD NOT ENGAGE.  AIRCRAFT RETURNED TO AIRFIELD.  LANDING NORMAL.  MX FOUND NR 1 & NR 2 YAW RATE GYRO'S AT FAULT.  REMOVED AND REPLACED NR 1 & NR 2 YAW RATE GYROS IAW 22-21-45.  OP'S CHECK SATISFACTORY. A/C RETURNED TO SERVICE.

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