SDR 8PCR20150910001

Service difficulty report · Bolt · Cessna 402C

Difficulty date: September 9, 2015
Submitted: September 10, 2015
Operation: Air carrier
Aircraft: N401SX
Make and model: Cessna 402C
Engine: Cont TSIO520VB
Engine time: 2,600 hours
System (JASC): 8520 · Reciprocating Engine Power Section
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

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

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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