# SDR 2001F00603

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 19, 2001
- Submitted: November 5, 2001
- Operation: Air carrier
- Aircraft: [N847AL](https://openairdocs.org/aircraft/N847AL), registered now
- Make and model: Bell 407
- Registry model: [Bell 407](https://openairdocs.org/model/bell-helicopter-textron-canada-407) (OpenAirDocs)
- Aircraft serial: 53150
- System (JASC): [6320 · Main Rotor Gearbox](https://openairdocs.org/jasc/6320)
- Part: Gear
- Part number: 6893673
- Part serial: NN146119
- Condition: Damaged
- Location: Gearbox
- 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/2001F00603

## Discrepancy

UPON DISASSEMBLY OF GEARBOX FOR N2 OVERSPEND INSPECTION, T/M GEAR HAS IMPROPER AND UNFINISHED MACHINING ON AFT SIDE OF LARGE GEAR TEETH.  SECONDARY DAMAGE, PINION GEAR P/N 6893672 S/N NN76746 TT INK.  SCRAP GALLING GEAR TEETH.  ASSURE GEAR HARDNESS AND PROPER MACHINING AT FACTORY.  (M)

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