# SDR 7217071607

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 16, 2007
- Submitted: August 4, 2007
- Operation: Air carrier
- Aircraft: [N170MC](https://openairdocs.org/aircraft/N170MC), registered now
- Make and model: Bolkms BK117B1
- Aircraft serial: 7217
- Engine: Lyc LTS101750B1
- System (JASC): [6510 · Tail Rotor Drive Shaft](https://openairdocs.org/jasc/6510)
- Part: Drive Shaft
- Part number: 11731542
- Condition: Damaged
- Location: Tail Rotor
- 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/7217071607

## Discrepancy

FOUND DURING INSPECTION,  THE FORWARD TAIL ROTOR DRIVESHAFT WAS FOUND TO HAVE A DEEP GROOVE WORN INTO THE TUBE NEAR THE END OF THE SHAFT EXCEEDING THE MECHANICAL DAMAGE LIMITS.  DAMAGE WAS CAUSED BY LOOSE REINFORCING WIRE FROM A NEARBY SCAT TUBE FOR THE AIR CONDITIONING DUCT.  THE DUCT HAD SEPARATED EXPOSING THE WIRE.

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