# SDR CA120201005

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 1, 2012
- Submitted: September 14, 2015
- Operation: General aviation
- System (JASC): [6114 · Propeller Hub Section](https://openairdocs.org/jasc/6114)
- Part: Piston
- Part number: 41012001
- Condition: Worn
- Location: M/R Servo
- Part time: 13,216 hours
- Stage of operation: NR
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CA120201005

## Discrepancy

(CAN) PLASMA COATING HAS DETACHED FROM THE HEAD OF THE PISTONS AS FOLLOWS:  PISTON SN AP4-0203, 75 PERCENT OF THE UPPER RING.  PISTON SN AP4-0202, 25 PERCENT OF BOTH RINGS.

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