# SDR CA150410015

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 16, 2015
- Submitted: August 5, 2015
- Operation: General aviation
- Make and model: Bell 407
- Registry model: [Bell 407](https://openairdocs.org/model/bell-helicopter-textron-canada-407) (OpenAirDocs)
- System (JASC): [6320 · Main Rotor Gearbox](https://openairdocs.org/jasc/6320)
- Part: Pinion Gear
- Part number: 407040034101
- Condition: Failed
- Location: M/R Transmission
- Part time: 5,040 hours
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CA150410015

## Discrepancy

(CAN) DURING FLIGHT,  THE CHIP LIGHT DETECTOR ILLUMINATED.  WHEN THE ACFT LANDED THE FLIGHT CREW HEARD A GROWLING NOISE THAT CAME FROM THE MAIN TRANSMISSION AREA.  TWO FERROUS NUGGETS WERE FOUND ATTACHED TO THE DETECTOR.  IT WAS FOUND THAT THE INPUT PINION GEAR TOOTH FRACTURED AND WAS LYING AT THE BOTTOM OF THE TRANSMISSION MAIN CASE.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.