# SDR 20000516SH022

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 31, 2000
- Submitted: May 16, 2000
- Operation: General aviation
- Aircraft: N404W
- Make and model: Bell 206L-4
- Registry model: [Bell 206L-4](https://openairdocs.org/model/bell-helicopter-textron-canada-206l-4) (OpenAirDocs)
- Aircraft serial: 52055
- System (JASC): [6320 · Main Rotor Gearbox](https://openairdocs.org/jasc/6320)
- Part: Bevel Gear
- Part number: 406040021101
- Part serial: AFS993
- Condition: Cracked
- Location: Transmission
- Part time: 3,185 hours
- Component: Transmission, Bell
- Component part number: 206040004115
- Stage of operation: CR
- How discovered: V
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/20000516SH022

## Discrepancy

TRANSMISSION LOWER CHIP LIGHT  ILLUMINATED IN-FLIGHT.  AFTER LANDING, INSPECTION FOUND FAIRLY LARGE FERROUS CHIP THAT APPEARED LIKE PIECE OF GEAR TOOTH.  TEAR-DOWN INSPECTION REVEALED INPUT SPIRAL BEVEL GEAR CRACKED 360 DEGREES THROUGH THE RING.  THE CRACK PATH TRAVELED THROUGH A BOLT HOLE.  RING GEAR REPLACEMENT IN PROGRESS AND CRACKED RING GEAR SENT TO BELL HELICOPTER PRODUCT SUPPORT ENG FOR EVALUATION AND ANALYSIS.  (X)

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