# SDR UALA2011062403103

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 23, 2011
- Submitted: July 20, 2011
- 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: 43,545 hours, 17,503 cycles
- Engine: Iae V2527A5
- System (JASC): [2910 · Hydraulic System, Main](https://openairdocs.org/jasc/2910)
- Part: Servo
- Part number: 31075270
- Part serial: 108
- Condition: Malfunctioned
- Location: Hyd System
- Stage of operation: NR
- How discovered: 9
- Nature of condition: E
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UALA2011062403103

## Discrepancy

STRONG AIRFRAME VIBRATION.  CREW REPORTED THAT VIBRATION DECREASED SUBSTANTIALLY WITH THE GREEN HYDS TURNED OFF AND CAME BACK WITH THE GREEN SYSTEM REACTIVATED.  FOUND WORN BEARINGS AT FITTINGS E BOTH C'S AND B AT VERTICAL STABILIZER ATTACH FITTING.  SHOULD READ UPPER 'B' BEARING FITTING WORN PER IPC ALONG WITH E AND BOTH C'S.  BASED ON CREW INPUT REPLACED GREEN SYSTEM ELEVATOR SERVO CONTROL.  OP CHECKED AND LEAK CHECKED GOOD.

---
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.