# SDR 2002UALA00631

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 31, 2002
- Submitted: April 9, 2002
- Operation: Air carrier
- Aircraft: N390UA
- Make and model: Boeing 737322
- Aircraft serial: 24665
- Aircraft time: 35,480 hours, 25,488 cycles
- Engine: Ge CFM56*
- System (JASC): [4920 · APU Core Engine](https://openairdocs.org/jasc/4920)
- Part: Turbine Wheel
- Part number: 4500381
- Part serial: V84HA535
- Condition: Failed
- Location: Apu
- Component: Apu, Hamltn, 62T47C1
- Stage of operation: IN
- How discovered: C
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2002UALA00631

## Discrepancy

APU HAD A COMPLETE FAILURE AFTER NORMAL START.  COMPRESSOR CASE SPLIT.  FOUND TURBINE WHEEL FAILED.  REPLACED APU AND MUFFLER.

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