# SDR ASAA2015052311850

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 23, 2015
- Submitted: May 27, 2015
- Operation: Air carrier
- Aircraft: [N442AS](https://openairdocs.org/aircraft/N442AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 43293
- Aircraft time: 5,927 hours, 1,911 cycles
- Engine: Cfmint CFM567B27E
- System (JASC): [7220 · Turbine Engine Air Inlet Section](https://openairdocs.org/jasc/7220)
- Part: Counterbalance
- Part number: 3013156240
- Condition: Out Of Adjust
- Location: Nr 2 Engine
- Stage of operation: IN
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2015052311850

## Discrepancy

NR 2 ENGINE TREND DATA SHOWS LOW PRESSURE ROTOR VIBRATION LEVELS TO BE TRENDING HIGHER THAN EXPECTED.  CURRENT LEVELS NEAR 1.5 UNITS.  ACFT GROUNDED.  NR 2 ENGINE ON BOARD FAN TRIM BALANCE COMPLETE IAW MM 71-00-00.

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