# SDR 99UAL900459

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 2, 1999
- Submitted: October 9, 2000
- Operation: Air carrier
- Aircraft: [N818UA](https://openairdocs.org/aircraft/N818UA), registered now
- Make and model: Airbus A319-131
- Registry model: [Airbus A319-131](https://openairdocs.org/model/airbus-industrie-a319-131) (OpenAirDocs)
- Aircraft serial: 882
- Engine: Iae V2522A5
- Engine time: 3,429 hours, 1,227 cycles
- System (JASC): [7230 · Turbine Engine Compressor Section](https://openairdocs.org/jasc/7230)
- Part: Blade
- Part number: 6A4254
- Condition: Failed
- Location: Stage 4
- Part time: 3,429 hours, 1,227 cycles
- Stage of operation: CL
- How discovered: O
- Nature of condition: Y
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/99UAL900459

## Discrepancy

RETURNED TO SFO DUE TO NR 1 ENGINE FAILURE.  *S/D*  STAGE 4 BLADE FAILED IN FATIGUE IN ROOT ATTACHMENT AREA, LIBERATING AIRFOIL AND PLATFORM AND CAUSING EXTENSIVE DOWNSTREAM DAMAGE.  THE MANUFACTURER HAS ISOLATED THE CAUSE TO A VSV SCHEDULE INTRODUCED WITH EEC SOFTWARE CHANGE NR 11.  EEC SOFTWARE WILL BE REVISED TO REVERT TO PREVIOUS VSV SCHEDULE.  A SERVICE BULLETIN IS EXPECTED IN APRIL OF 2000.

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