# SDR AALA201808309023

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 28, 2018
- Submitted: August 31, 2018
- Operation: Air carrier
- Aircraft: [N157UW](https://openairdocs.org/aircraft/N157UW), registered now
- Make and model: Airbus A321-211
- Registry model: [Airbus A321-211](https://openairdocs.org/model/airbus-a321-211) (OpenAirDocs)
- Aircraft serial: 5696
- Aircraft time: 17,531 hours, 7,051 cycles
- Engine: Cfmint CFM565B33
- Engine time: 17,550 hours, 7,057 cycles
- System (JASC): [7700 · Engine Indicating System](https://openairdocs.org/jasc/7700)
- Part: Engine
- Condition: Vibration
- Location: Left
- Stage of operation: CR
- How discovered: O
- Nature of condition: E
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA201808309023

## Discrepancy

DURING CRUISE AT FL340 AN ABRUPT VIBRATION WAS FELT AFTER SLOWING, REALIZED WAS COMING FROM LEFT ENGINE, VIBRATION WAS AS HIGH AS 2.0.  THE AIRCRAFT WAS GROUNDED.  ACCOMPLISHED A NR 1 ENGINE VIBRATION CHECK IAW AMM 71-00-00-710-009-B-6 AND FAN VIBRATION LESS THAN 4 UNITS WITH NOISE AND RUMBLE TSM 77-00-00-810-862A. VIBRATION MAXED OUT AT 70% NR 1 TO 3.7 NR 1. OKAY FOR SERVICE.

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