SDR 7IL2015F00003

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: Lt Engine
Part time: 758 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, SN60652-27, NR 5 LOCATION, SN 60652-25, NR 4 LOCATION, SN 606652-23. 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. ENGINE WAS MODIFIED IAW STC SE4327SW-D. CRACKS WERE DETECTED VIA SOAP BUBBLE TEST, EXCEPT THAT NR 5 CYLINDER HAD AUDIBLE HISS DURING COMPRESSION TEST AND HOLE BURNED IN BAFFLING.

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