The National Transportation Safety Board (NTSB) is a U.S. government organization responsible for investigation of accidents involving aviation, highway, marine, pipelines and railroads in the United States. It is charged by the U.S. Congress to investigate every civil aviation accident in the United States, as well as significant accidents in other modes of transportation.
The recommendation revealed that the NTSB examined its own accident database and found that over the last 30 years, there were 125 accidents or incidents involving muffler failure on single-engine, piston airplanes that resulted in 42 fatalities and 27 serious injuries.
The NTSB’s metallurgist found that the inlet end of the muffler case on the left side was crushed and contained a large crack that extended approximately 2⁄3 of the muffler circumference.
The NTSB determined that the probable cause of the accident was an exhaust gas leak because of inadequate maintenance, which resulted in carbon-monoxide poisoning, and the incapacitation of the pilot.
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