# SDR UPS97224775

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 24, 1997
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: [N907UP](https://openairdocs.org/aircraft/N907UP), registered now
- Make and model: Boeing 727-27C
- Registry model: [Boeing 727-27C](https://openairdocs.org/model/boeing-727-27c) (OpenAirDocs)
- Aircraft serial: 19118
- System (JASC): [2210 · Autopilot System](https://openairdocs.org/jasc/2210)
- Part: Yaw Damper
- Part number: 25858001
- Condition: Inoperative
- Location: E/E Compt
- 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/UPS97224775

## Discrepancy

INSPECTION TYPE-N/A, UNCOMMANDED UPPER FULL RT DEFLECTION.  A/C STARTED ROLL LOWER RUDDER INPUT OF YAW DAMP CORRECT.  UPPER RUD HYD SHUT OFF, RUDDER SLOWLY DRIFTED BACK TO CENTER.  LANDED WITH LOWER RUDDER ONLY.  *S/D*  REMOVED AND REPLACED UPPER YAW IAW MM 22-11-13 OPS CHK GOOD.  (P/N 2585800-1) (S/N 0550647) ON, (0661015) OFF.

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