# SDR SB07034

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 22, 2007
- Submitted: April 26, 2007
- Operation: Air carrier
- Aircraft: [N422US](https://openairdocs.org/aircraft/N422US), registered now
- Make and model: Boeing 737401
- Aircraft serial: 23989
- Aircraft time: 50,237 hours, 33,976 cycles
- Engine: Ge CFM56*
- Engine time: 48,706 hours, 30,380 cycles
- System (JASC): [7200 · Engine (Turbine/Turboprop)](https://openairdocs.org/jasc/7200)
- Part: Engine
- Part number: 9325M85G03
- Part serial: 725124
- Condition: Failed
- Location: Left
- Part time: 48,706 hours, 30,380 cycles
- Stage of operation: CL
- How discovered: O
- Nature of condition: Y, J
- Precautionary procedure: E, A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/SB07034

## Discrepancy

BWI   FLT1517   DURING CLIMB-OUT FROM DCA, EN ROUTE TO TPA, CREW REPORTED THE NR 1 ENGINE OIL FILTER BYPASS LIGHT ILLUMINATED AND REMAINED ON.  CREW DECLARED AN EMERGENCY, SHUT DOWN THE NR 1 ENGINE AND DIVERTED TO BWI.  FLIGHT LANDED WITHOUT FURTHER INCIDENT.  MAINTENANCE FOUND METAL IN THE NR 1 ENGINE FORWARD CHIP DETECTOR.  CHIP ANALYSIS REVEALED M50 BEARING MATERIAL.  REMOVED AND REPLACED NR 1 ENGINE ASSEMBLY PER JOB CARD JK71-00-01. OPERATIONAL CHECK AND LEAK CHECK GOOD.

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