# SDR CA050629004

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 3, 2005
- Submitted: August 3, 2005
- Operation: General aviation
- Make and model: Boeing 747-400
- Registry model: [Boeing 747-400](https://openairdocs.org/model/boeing-747-400) (OpenAirDocs)
- System (JASC): [4920 · APU Core Engine](https://openairdocs.org/jasc/4920)
- Part: Apu
- Part number: PW901A
- Part serial: 900401
- Condition: Damaged
- Location: Apu Bay
- 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/CA050629004

## Discrepancy

THE APU SUFFERED DAMAGE TO THE HIGH PRESSURE TURBINE BLADES AND SHEARING OF THE POWER TURBINE SHAFT AND CASING FLANGE BOLTS.  P&WC WILL INVESTIGATE THE EVENT AND ADVISE OF ROOT CAUSE ONE DETERMINED.

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