SDR CA010213006

Service difficulty report · Cylinder Head · Cessna 421B

Difficulty date: January 26, 2001
Submitted: February 23, 2001
Operation: General aviation
Make and model: Cessna 421B
Aircraft time: 5,056 hours
Engine: Cont GTSIO520H
Propeller: Mcauly 3AF34C92
System (JASC): 8530 · Reciprocating Engine Cylinder Section
Part: Cylinder Head
Condition: Cracked
Location: Sp Plug-Injectr
Component: Cylinder-Engine · Cont · 642344
Stage of operation: IN
How discovered: V
Nature of condition: O
Precautionary procedure: O

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

What was found

(CAN) AT 100 HOUR INSPECTION IN NOVEMBER 2000, FOUND FOUR CYLINDERS WITH SIMILAR CRACKS. AT NEXT 100 HOUR INSPECTION IN JANUARY 2001 FOUND SIX MORE CYLINDERS WITH CRACKS IN SAME LOCATION (BETWEEN SPARK PLUG HOLE AND INJECTOR HOLE). CYLINDERS REPLACED AFTER DETECTING CRACKS. PAST EXPERIENCE SHOWS THAT CRACKS ARE VERY COMMON IN THIS AREA.2001-02-15 TC: PART #S, TSN, ADDITIONAL CONTRIBUTING FACTORS WERE NOT GIVEN.

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