# SDR 96ZZZX4187

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 6, 1996
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: [N228NW](https://openairdocs.org/aircraft/N228NW), registered now
- Make and model: Doug DC-10-30
- Registry model: [Doug DC-10-30](https://openairdocs.org/model/mcdonnell-douglas-dc-10-30) (OpenAirDocs)
- Aircraft serial: 46578
- System (JASC): [2210 · Autopilot System](https://openairdocs.org/jasc/2210)
- Part: Rate Gyro
- Part number: 14641066
- Condition: Failed
- Location: Upper Yaw Damper
- Part time: 75,849 hours
- Stage of operation: IN
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/96ZZZX4187

## Discrepancy

DURING CHECK, UPPER YAW DAMPENER FAILED SYSTEM NR 2 TEST ON FLIGHT GUIDANCE MANAGEMENT ASSESSMENT PANEL.  TROUBLESHOT FOUND B-CHANNEL YAW RATE GYRO INOP.  ALSO, FOUND RESISTANCE OF A AND B ON LVDT IS LOWER THAN NORMAL.  REMOVED AND REPLACED RATE GYRO.  REMOVED AND REPLACED UPPER FORWARD RUDDER ACTUATOR IAW MM 27-30-00.  MAINTENANCE ACCOMPLISHED BY LOCKHEED MARTIN AIRCRAFT CENTER,  ZJ4R702M.   REFERENCE:  OPERATOR CONTROL NR 96037-1228-20.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.