# SDR 20000502SH013

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 5, 2000
- Submitted: May 2, 2000
- Operation: General aviation
- Aircraft: [N937AL](https://openairdocs.org/aircraft/N937AL), registered now
- Make and model: Bell 407
- Registry model: [Bell 407](https://openairdocs.org/model/bell-helicopter-textron-canada-407) (OpenAirDocs)
- Aircraft serial: 53383
- System (JASC): [6320 · Main Rotor Gearbox](https://openairdocs.org/jasc/6320)
- Part: Pinion Gear
- Part number: 6893672
- Part serial: NN77720
- Condition: Galled
- Location: Gearbox
- Part time: 234 hours
- Component: Gearbox, Allsn
- Component part number: 23063393
- Stage of operation: IN
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/20000502SH013

## Discrepancy

UPON VISUAL INSPECTION, INSPECTED CHIP DETECTOR PLUGS AND FOUND METAL ON PLUGS. SPALLING AND GALLING IN PINION GEAR TEETH, POSSIBLE DUE TO IMPROPER MESHING OF GEAR TEETH.  (X)

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