# SDR 99UAL900413

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 10, 1999
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: N915UA
- Make and model: Boeing 737522
- Aircraft serial: 25382
- Engine: Ge CFM56*
- System (JASC): [7200 · Engine (Turbine/Turboprop)](https://openairdocs.org/jasc/7200)
- Part: Engine
- Condition: Failed
- Location: Nr 1
- Stage of operation: DE
- Nature of condition: E
- Precautionary procedure: E
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/99UAL900413

## Discrepancy

HEARD A THUNK AND EXPERIENCED VIBRATION IN NR 1 ENGINE.  GOT LOW OIL PRESSURE AND EXHAUST GAS TEMPERATURE SHOWED 813 DEGREES CELSIUS.  *S/D*  REPLACED NR 1 ENGINE.  AIRCRAFT OPERATIONAL CHECKS GOOD.  SHOP INDICATIONS, SHOW FAILURE OF THE NR 4 BEARING WAS THE ROOT CAUSE FOR THE IN-FLIGHT SHUT DOWN AND N1 ROTOR SEIZURE ON THE GROUND.

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