# SDR ALG2001F00041

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 3, 2001
- Submitted: November 27, 2001
- Operation: Air carrier
- Aircraft: [N497AL](https://openairdocs.org/aircraft/N497AL), registered now
- Make and model: Bell 407
- Registry model: [Bell 407](https://openairdocs.org/model/bell-helicopter-textron-canada-407) (OpenAirDocs)
- Aircraft serial: 53172
- Engine: Allsn 250C47B
- System (JASC): [7260 · Turbine Engine Accessory Drive](https://openairdocs.org/jasc/7260)
- Part: Bearing
- Part number: 23066678
- Part serial: JJ00454
- Condition: Failed
- Location: Gearbox
- Part time: 4,254 hours
- Component: Gearbox, Allsn, C47B
- Component part number: 23063393
- Stage of operation: NR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ALG2001F00041

## Discrepancy

UPON DISASSEMBLY OF GEARBOX DUE TO CHIP LIGHT.  NR 4 BEARING FAILURE.  TOOTH MISSING FROM GEAR ON PINION GEAR, AND DAMAGED GEAR TEETH ON T/M GEAR.

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