# SDR UIEA2022070700729

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 7, 2022
- Submitted: July 11, 2022
- Operation: Air carrier
- Aircraft: [N747BC](https://openairdocs.org/aircraft/N747BC), registered now
- Make and model: Boeing 747
- Aircraft serial: 25879
- Aircraft time: 53,056 hours
- System (JASC): [2216 · Autopilot Trim Servo](https://openairdocs.org/jasc/2216)
- Part: None
- Condition: None
- Stage of operation: CR
- How discovered: O
- Nature of condition: F
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UIEA2022070700729

## Discrepancy

4 UN-COMMANDED LEFT YAW EVENTS WHILE IN CRUISE. EICAS YAW DAMPER UPPER AND YAW DAMPER UPPER STS MSG(<P>PLACED UPPER YAW DAMPER ON MEL 22-21-01.</P>)

---
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.