# SDR 97UAL900053

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 19, 1997
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: N1836U
- Make and model: Doug DC-10-10
- Registry model: [Doug DC-10-10](https://openairdocs.org/model/mcdonnell-douglas-dc-10-10) (OpenAirDocs)
- Aircraft serial: 47968
- Engine: Ge CF66D
- System (JASC): [2720 · Rudder Control System](https://openairdocs.org/jasc/2720)
- Part: Spring
- Part number: AMH70021
- Condition: Broken
- Location: Upper Rudder
- Part time: 75,833 hours
- Stage of operation: LD
- Nature of condition: F
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/97UAL900053

## Discrepancy

THE RUDDER LOCKED UP ON LANDING, UNABLE TO MOVE IN ANY DIRECTION.  THE RUDDER CAME LOOSE AFTER TURNING OFF THE RUNWAY. *S/D*  THE SECOND STAGE LOAD FEEL SPRING ON THE UPPER RUDDER MECHANISM BROKE AND OBSTRUCTED FREE MOVEMENT OF THE UPPER MECHANISM, SUBSTANTIALLY  INCREASING PEDAL FORCES.  REPLACED THE SECOND STAGE SPRING.

---
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.