NTSB Identification: ANC06LA144.
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Accident occurred Saturday, September 30, 2006 in Juneau, AK
Probable Cause Approval Date: 09/27/2007
Aircraft: Cessna TU206A, registration: N206AK
Injuries: 2 Uninjured.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

The commercial certificated pilot was on a cross-country positioning flight under Title 14, CFR Part 91, in a float-equipped airplane, when the number 6 engine cylinder separated from the engine through the engine cowling. The pilot made a hard emergency landing in steep ocean swells, and was able to beach the airplane. The airplane received structural damage to the wings and fuselage during the landing. An examination of the eight studs holding the number 6 cylinder to the engine case, revealed they were either broken or their threads were stripped. An examination of maintenance logbooks did not reveal any unresolved preaccident mechanical anomalies.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

The separation of the number 6 cylinder assembly from the engine during cruise flight, which resulted in a hard forced landing in rough ocean swells. A factor contributing to the accident was the rough ocean swells.

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