# SDR 2004UALA00541

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 2, 2004
- Submitted: June 8, 2004
- Operation: Air carrier
- Aircraft: N922UA
- Make and model: Boeing 737522
- Aircraft serial: 26642
- Aircraft time: 34,301 hours, 25,738 cycles
- Engine: Ge CFM56*
- System (JASC): [7200 · Engine (Turbine/Turboprop)](https://openairdocs.org/jasc/7200)
- Part: Fan Blade
- Condition: Incorrect
- Location: Nr 1 Engine
- Stage of operation: CL
- How discovered: O
- Nature of condition: E, J, W
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2004UALA00541

## Discrepancy

NUMBER 1 ENGINE VIBRATION AT 5.0.  INCORRECT REPLACEMENT OF 2 FAN BLADE PAIRS RESULTED IN UN-BALANCED FAN SYSTEM.  REPLACED FAN BLADES.

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