On June 30, 2003, a Cessna 210 (registration N9544T) was involved in an aviation accident near Henderson, NV. Investigators recorded the probable cause as: A 3/16-inch hex bolt protruding into the engine fuel port restricted fuel flow, leading to a loss of engine power. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive; 8 related events involving the same aircraft type or operator are linked below.
A pilot lost engine power in the landing pattern and landed short of the runway. A post-accident examination found a hex bolt restricting fuel flow in the engine fuel port.
Accident Sequence
The pilot reported a loss of engine power while in the landing pattern. Despite attempts to restart the engine, the airplane landed short of the runway and sustained structural damage.
Post-Accident Examination
A post-accident engine examination did not reveal any mechanical malfunctions. The fuel selector was removed for inspection. Inside, a 3/16-inch hex bolt was found protruding into one of the engine fuel ports, effectively restricting the flow of fuel to the engine.
Engine Examination Findings
The spark plugs were examined and compared to a manufacturer's condition chart. The comparison disclosed lean operating signatures.
Probable cause
A 3/16-inch hex bolt protruding into the engine fuel port restricted fuel flow, leading to a loss of engine power.