# SDR 2007UALA00786

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 16, 2007
- Submitted: March 20, 2007
- Operation: Air carrier
- Aircraft: [N446UA](https://openairdocs.org/aircraft/N446UA), registered now
- Make and model: Airbus A320-232
- Registry model: [Airbus A320-232](https://openairdocs.org/model/airbus-a320-232) (OpenAirDocs)
- Aircraft serial: 834
- Aircraft time: 30,185 hours, 11,570 cycles
- Engine: Iae V2527A5
- System (JASC): [5100 · Standard Practices/Structures](https://openairdocs.org/jasc/5100)
- Part: Unknown
- Condition: Vibration
- Stage of operation: CR
- How discovered: O
- Nature of condition: E
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2007UALA00786

## Discrepancy

HIGH FREQUENCY VIBRATION STARTED 23,500- 330 KNOTS WENT AWAY  24,500-300 KNOTS RETURNED AGAIN 25,000-315 KNOTS AND STOPPED 30,500-290 KNOTS .76 MACH.  VIBRATION VERY NOTICEABLE THROUGHOUT CABIN.  FLT CONTROLS SEEMED OK.  CREW REPORTED UP & DOWN OSCILLATION THROUGHOUT AC.  [SUP 06-01-07]  PERFORMED ELEVATOR FREEPLAY AND OSCILLATION CHECKS. RT ELEVATOR SERVO VALVE FAILED OSCILLATION TEST AND WAS REPLACED.

---
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.