NTSB Identification: LAX06LA048.
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Accident occurred Sunday, November 27, 2005 in San Diego, CA
Probable Cause Approval Date: 04/25/2007
Aircraft: Cessna 182A, registration: N3936D
Injuries: 1 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 engine experienced a loss of power and the airplane collided with a fence while the pilot was performing a forced landing. As the airplane approached the vicinity of the destination airport, the engine experienced a total loss of power. The pilot made a forced landing on highway about 2 miles from the airport. During the landing roll, the airplane impacted a fence. A post accident examination of the engine revealed that rotation of the crankshaft did not generate rotation of the camshaft. Removal of the starter drive gear assembly revealed that four gear teeth were missing from the camshaft sprocket and one gear tooth was missing from the crankshaft sprocket. The gear teeth were retrieved and sent to the Safety Board Materials Laboratory for examination. The camshaft gear sprocket failed due to fatigue initiating at the root of one of the teeth. Several other teeth had fatigue consistent with secondary initiation due to load shedding from the original failed tooth; the crankshaft gear failure was also secondary. Microstructural examination and hardness testing was performed on a section of a camshaft tooth, which met drawing specifications. A thin layer of decarburization was observed on the surface.
The National Transportation Safety Board determines the probable cause(s) of this accident to be: The failure of the camshaft due to fatigue of one of the gear teeth, which resulted in a loss of engine power. Factors were the fence and the fence post.
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