# SDR ASAA2017071621392

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 16, 2017
- Submitted: July 17, 2017
- Operation: Air carrier
- Aircraft: [N457AS](https://openairdocs.org/aircraft/N457AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 36355
- Aircraft time: 13,827 hours, 4,568 cycles
- Engine: Cfmint CFM567B27E
- System (JASC): [7220 · Turbine Engine Air Inlet Section](https://openairdocs.org/jasc/7220)
- Part: Engine
- Condition: Out Of Balance
- Location: Nr 1
- Stage of operation: NR
- How discovered: O
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2017071621392

## Discrepancy

NR 1 ENGINE TREND DATA SHOWS LOW PRESSURE ROTOR VIBRATION LEVELS CONTINUE TO RISE AFTER LAST FAN LUBE.  PRI NR 2 ENGINE RUN REQUIRED.  ACFT GROUNDED.  COMPLIED WITH ALL STEPS OF TSR908522,  ACCOMPLISHED ON BOARD FAN TRIM BALANCE PROCEDURE IAW AMM 71-00-00-750-808-F00.  BALANCE WEIGHTS CHANGED AS FOLLOWS NR 6 P03 TO P014, NR 26 P014 TO P011, NR 36 P03 TO P014, NR 36 P014 TO P011. ACCOMPLISHED VIBRATION SURVEY IAW AMM 71-00-00, TEST 7, VIBRATION WITHIN ACCEPTABLE LIMITS IN ALL PHASES. GROUND VERIFICATION SUCCESSFUL.

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