# SDR AU990795

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 29, 1999
- Submitted: March 26, 2000
- Operation: General aviation
- Make and model: Cessna 172N
- Registry model: [Cessna 172N](https://openairdocs.org/model/cessna-172n) (OpenAirDocs)
- Engine: Lyc O320D2G
- Propeller: Mcauly 1C160DTM
- System (JASC): [3252 · Shimmy Damper](https://openairdocs.org/jasc/3252)
- Part: Pin
- Part number: NAS561P414
- Condition: Wrong Part
- Location: Mlg
- Component: 04425121
- Stage of operation: IN
- Nature of condition: W
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AU990795

## Discrepancy

(AUS) INCORRECT SHIMMY DAMPER PISTON ROLL PIN FITTED.  A BRASS SCREW WAS USED INSTEAD OF THE CORRECT STEEL ROLL PIN.  THE BRASS SCREW SHEARED CAUSING COMPLETE FAILURE OF THE DAMPER WITH ASSOCIATED NOSE WHEEL SHIMMY.  UNAPPROVED PART.

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