# SDR SWIA200413121

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 28, 2004
- Submitted: April 12, 2004
- Operation: Air carrier
- Aircraft: N579SW
- Make and model: Emb EMB-120ER
- Registry model: [EMB EMB-120ER](https://openairdocs.org/model/embraer-emb-120er) (OpenAirDocs)
- Aircraft serial: 120347
- Aircraft time: 11,980 hours, 16,317 cycles
- Engine: Pwa PW118B
- System (JASC): [2215 · Autopilot Main Servo](https://openairdocs.org/jasc/2215)
- Part: Servo
- Part number: 6225734002
- Part serial: 10275
- Condition: Faulty
- Location: Autopilot Sys
- Part time: 9,597 hours, 12,861 cycles
- Stage of operation: TX
- How discovered: O
- Nature of condition: F
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/SWIA200413121

## Discrepancy

RATCHETING NOISE HEARD WITH SLIGHT NOTCH FEELING WHEN YOKE IS MOVED TO FULL AFT POSITION.  MOVED YOKE THROUGH TRAVEL WITH A/P ON, SEEMED TO CLEAR PROBLEM.  REPLACED AUTOPILOT ELEVATOR SERVO.  OPS CHECK GOOD IAW MM 22-10-00.

---
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.