# SDR UALA2008122607011

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 26, 2008
- Submitted: December 31, 2008
- Operation: Air carrier
- Aircraft: [N204UA](https://openairdocs.org/aircraft/N204UA), registered now
- Make and model: Boeing 777222
- Aircraft serial: 28713
- Aircraft time: 44,683 hours, 6,457 cycles
- Engine: Pwa PW40903
- Engine time: 42,763 hours, 6,596 cycles
- System (JASC): [7230 · Turbine Engine Compressor Section](https://openairdocs.org/jasc/7230)
- Part: Compressor
- Part serial: 22130
- Condition: Damaged
- Location: Nr 1 Engine
- Stage of operation: CR
- 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/UALA2008122607011

## Discrepancy

SILENT SURGE DETECTED - NR 1 ENGINE.  MM BORESCOPED ENGINE AND FOUND NUMEROUS STAGE-8 AND STAGE-9 HP COMPRESSOR BLADES DAMAGED, WITH PIECES MISSING AND BENT AIRFOILS.  THE ENGINE WAS REPLACED PRIOR TO FURTHER FLIGHT.

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