# SDR 99ZZZX4401

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 27, 1999
- Submitted: March 26, 2000
- Operation: General aviation
- Aircraft: [N407LG](https://openairdocs.org/aircraft/N407LG), registered now
- Make and model: Bell 407
- Registry model: [Bell 407](https://openairdocs.org/model/bell-helicopter-textron-canada-407) (OpenAirDocs)
- Aircraft serial: 53143
- System (JASC): [6230 · Main Rotor Mast/Swashplate](https://openairdocs.org/jasc/6230)
- Part: Bearaing
- Part number: 406040036107
- Condition: Making Metal
- Location: M/R Mast
- Part time: 462 hours
- Stage of operation: NR
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/99ZZZX4401

## Discrepancy

PILOTS REPORTED MAIN ROTOR TRANS. CHIP LIGHT CAME ON.  CHIP PLUGS INSPECTED AND FOUND METAL PARTICLES ON UPPER CHIP DETECTOR.  HELICOPTER FLOWN AGAIN AND AFTER A FEW HOURS, THE LIGHT CAME ON AGAIN.  CHIP PLUGS INSPECTED AND FOUND METAL ON UPPER PLUG.  MAST ASSY REPLACED.  CAUSE WAS FAULTY BEARING.

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