# SDR SIMA982792

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 6, 1998
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: [N604DG](https://openairdocs.org/aircraft/N604DG), registered now
- Make and model: Emb EMB-145LR
- Registry model: [EMB EMB-145LR](https://openairdocs.org/model/embraer-emb-145lr) (OpenAirDocs)
- Aircraft serial: 145058
- System (JASC): [2720 · Rudder Control System](https://openairdocs.org/jasc/2720)
- Part: Rudder Control
- Part number: 3603001001
- Condition: Inoperative
- Location: Vert Stabilizer
- Stage of operation: NR
- Nature of condition: F
- Precautionary procedure: A, H
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/SIMA982792

## Discrepancy

ORD - FLT 4007 - RUDDER SYSTEMS 1 AND 2 INOPERATIVE.  EMERGENCY DECLARED.  MECHANICAL REVERSION MODE CONFIRMED.  FIRST OFFICER FELT THAT HYDRAULIC SYSTEM WAS LOST.  AUTOPILOT AND YAW DAMPENER FAILED.  REMOVED AND REPLACED RUDDER POWER CONTROL UNIT.  OPERATIONAL CHECK GOOD.  (X)

---
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.