# SDR 2A6D2015082525391

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 25, 2015
- Submitted: August 25, 2015
- Operation: General aviation
- Filed by: [Air Methods LLC, repair station 2A6D933B](https://openairdocs.org/faa-repair-station/2A6D933B/air-methods-llc.md) (OpenAirDocs)
- Aircraft: [N105AM](https://openairdocs.org/aircraft/N105AM), registered now
- Make and model: Bell 407
- Registry model: [Bell 407](https://openairdocs.org/model/bell-helicopter-textron-canada-407) (OpenAirDocs)
- Aircraft serial: 54024
- Aircraft time: 1,437 hours, 5,053 cycles
- Engine: Allsn 250C47B
- System (JASC): [6320 · Main Rotor Gearbox](https://openairdocs.org/jasc/6320)
- Part: Duplex Bearing
- Part number: 40734003201
- Part serial: ZS1127
- Condition: Damaged
- Location: Main Trans
- Part time: 1,437 hours, 5,053 cycles
- Component: Main Trans, Bell
- Component part number: 407040006123
- Stage of operation: AA
- 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/2A6D2015082525391

## Discrepancy

MAIN TRANSMISSION PN 407-040-006-123, SN A-1061, TT 1436.9 MAKING METAL WAS PULLED FROM THE ACFT & DISASSEMBLED.  INSPECTED & FOUND THE DUPLEX BEARING PN 407-340-032-010, SN ZS1127 INSTALLED.  HAS TWO BALL BEARINGS STARTED PITTING & FAILING.

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