Shortly after takeoff in Wild Rose, Wis., the Titan Tornado’s engine lost power. The airplane hit trees and then terrain, resulting in substantial damage and serious injury.
A post-accident examination revealed that one spark plug and its lead assembly had separated from its cylinder. Examination of the threads and the orifice on the cylinder revealed no anomalies.
Further examination revealed that the remaining spark plugs were loose but had not separated from their cylinders. It is likely that the spark plug that had become separated was also loose and not properly secured during maintenance.
The NTSB determined the probable cause as the improperly secured spark plug, which resulted in a total loss of engine power.
NTSB Identification: CEN13LA460
This August 2013 accident report is provided by the National Transportation Safety Board. Published as an educational tool, it is intended to help pilots learn from the misfortunes of others.