NTSB Identification: MIA02LA089.
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Accident occurred Thursday, April 25, 2002 in Tampa, FL
Probable Cause Approval Date: 09/30/2003
Aircraft: Cessna 421C, registration: N237SM
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.

According to the pilot's statement, after a landing and upon touchdown, he said he "…observed an abnormal touchdown...and knew there was a mechanical problem." He aborted the landing, cycled the gear twice, and noted the gear unsafe light had remained illuminated. He then returned to the departure airport, for further assessment of the landing gear situation by the tower personnel. The tower personal confirmed there was damage to the left main gear, He then proceeded to burn off about 1 1/2 hours of fuel before attempting a landing. The pilot landed on the grass next to the paved runway, touching down on the nose and right main landing gears. Examination of the landing gear revealed that the upper barrel (p/n 5141002-11) fractured as result of fatigue cracking, above a brazed-on collar, as a result of improper machining after the barrel was assembled during the manufacturing process.

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

the fracture of the landing gear upper barrel due to fatigue cracking, caused by improper machining after the barrel was assembled during the manufacturing process, resulting in damage to the airplane.

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