SDR 7IL2015F00002

Service difficulty report · Cylinder Head · Cessna 414

Difficulty date: January 16, 2015
Submitted: January 30, 2015
Operation: Air carrier
Aircraft: N490KM
Make and model: Cessna 414
Aircraft serial: 4140399
Engine: Cont IO520NB
System (JASC): 8530 · Reciprocating Engine Cylinder Section
Part: Cylinder Head
Condition: Cracked
Location: Nr 6 Cylinder
Part time: 621 hours
Component: Cylinder · Eci
Component part number: AEC631397
Stage of operation: IN
How discovered: 9
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

WHILE PERFORMING 100 HR INSPECTION OF ACFT, FOUND CRACKS IN CYLINDERS NR 3 LOCATION, SN64015-16, NR 5 LOCATION, SN64016-17, NR 6 LOCATION, SN 63936-02. CRACKS WERE FOUND IN THE HEAD CASTING ON THE INTAKE VALVE SIDE IN THE VICINITY OF FINS 15-17 AS COUNTED OTBD FROM THE HEAD/BARREL JUNCTION. ENGINES WERE MODIFIED IAW STC SE4327SW-D.

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