# SDR USAA2011040891381

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 7, 2011
- Submitted: April 12, 2011
- Operation: Air carrier
- Aircraft: [N184US](https://openairdocs.org/aircraft/N184US), registered now
- Make and model: Airbus A321-211
- Registry model: [Airbus A321-211](https://openairdocs.org/model/airbus-a321-211) (OpenAirDocs)
- Aircraft serial: 1651
- Aircraft time: 32,553 hours, 11,840 cycles
- Engine: Cfmint CFM565B4
- Engine time: 28,517 hours, 11,660 cycles
- System (JASC): [7200 · Engine (Turbine/Turboprop)](https://openairdocs.org/jasc/7200)
- Part: Bearing
- Part number: 3053557170
- Part serial: DC150655
- Condition: Failed
- Location: Engine
- Part time: 28,517 hours, 11,660 cycles
- Stage of operation: CR
- How discovered: O
- Nature of condition: E, Y
- Precautionary procedure: B
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/USAA2011040891381

## Discrepancy

FLT 1446 -AT CRUISE, 5.2 VIBRATION INDICATION ON N2.  BEGAN NEARING A THUMPING SOUND WHICH WAS MORE PRONOUNCED IN THE REAR OF THE AIRCRAFT AS CONFIMED BY THE FLIGHT ATTENDANTS.  N2 WENT TO 9 AND THE ENGINE BEGAN TO SPOOL DOWN.  CREW PERFORMED ENGINE SHUTDOWN PROCEDURES AND DECLARED EMERGENCY, DIVERTED TO OMA.  REMOVED AND REPLACED NR 2 ENGINE PER PER JPC 2640071001.  VENDOR IDENTIFIED FAILURE OF NR 4 BEARING AS THE ROOT CAUSE.

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