# SDR NX4R000010

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 11, 2011
- Submitted: April 11, 2011
- Operation: General aviation
- Aircraft: [N453ER](https://openairdocs.org/aircraft/N453ER), registered now
- Make and model: Cessna 172S
- Registry model: [Cessna 172S](https://openairdocs.org/model/cessna-172s) (OpenAirDocs)
- Aircraft serial: 172S10500
- System (JASC): [2701 · Control Column Section](https://openairdocs.org/jasc/2701)
- Part: Shaft
- Part number: 05600595
- Condition: Worn
- Location: Yoke
- Part time: 3,356 hours
- 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/NX4R000010

## Discrepancy

DURING AN INSPECTION, THE TECH NOTICED AN INDENTATION IN THE PILOT'S YOKE SHAFT.  ALTHOUGH SMOOTH, IT WAS NOTICED THAT A SUBSTANTIAL AMOUNT OF THE WALL THICKNESS WAS WORN AWAY. IF SITTING IN THE CO-PILOT'S SEAT, THE WEAR WOULD BE LOCATED AT THE 6 O'CLOCK POSITION OF THE SHAFT WEAR IT RESTS ON THE PANEL BEARINGS DURING NORMAL OPERATION.  AFTER DISCUSSING THE ISSUE WITH THE MFG, A TOTAL WEAR OF .009" WAS ALLOWED. THIS WEAR WAS .017".  THE SHAFT WAS REPLACED.  ALTHOUGH THIS IS IN A VERY EASY PLACE TO INSPECT, THE SMOOTH FEEL OF THE WEAR MAY HIDE THE SERIOUSNESS OF THE PROBLEM.

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