# SDR 8PCR20150910001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 9, 2015
- Submitted: September 10, 2015
- Operation: Air carrier
- Aircraft: [N401SX](https://openairdocs.org/aircraft/N401SX), registered now
- Make and model: Cessna 402C
- Registry model: [Cessna 402C](https://openairdocs.org/model/cessna-402c) (OpenAirDocs)
- Engine: Cont TSIO520VB
- Engine time: 2,600 hours
- System (JASC): [8520 · Reciprocating Engine Power Section](https://openairdocs.org/jasc/8520)
- Part: Bolt
- Part number: 536379
- Condition: Sheared
- Location: Engine
- Part time: 2,500 hours
- Component: Crankshaft, Cont
- Component part number: 632893
- 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/8PCR20150910001

## Discrepancy

CRANKSHAFT CLUSTER GEAR BOLTS, PN 536379, HAD SHEARED ALLOWING THE DISENGAGEMENT OF THE LARGE GEAR THAT COUPLES WITH THE STARTER ADAPTER SHAFT-GEAR.  THE ENG WAS NOT IN COMPLIANCE WITH SERVICE BULLETINS SIL06-3 & SB13-6, WHICH RECOMMEND REPLACEMENT OF THE GEAR BOLTS WITH PN 656990 & LARGE CRANKSHAFT GEAR WITH PN 656991 REV C OR SUBSEQUENT.

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