On May 29, 2004, a Simmons BD-5 (registration N501BD) was involved in an aviation accident near Goodyear, AZ. Investigators recorded the probable cause as: The overheating and failure of the number 4 connecting rod, which resulted in a total loss of engine power during descent. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.
A single-engine experimental amateur-built airplane lost engine power and collided with sagebrush on an abandoned airport during a forced landing. Post-accident examination found the number 4 connecting rod had failed and was discolored black.
Accident Summary
A single-engine experimental airplane experienced a loss of engine power and subsequently collided with sagebrush growing on an abandoned airport. The forced landing occurred after the engine ceased to operate normally. The aircraft was an amateur-built design.
Aircraft and Engine
The airplane utilized a Honda EB-3 engine mounted at the rear. The engine was a single-unit powerplant of the experimental category.
Post-Accident Examination
Following the accident, an examination of the engine was conducted. Investigators found that the number 4 connecting rod had failed. The failed rod and the corresponding crankshaft throw for that cylinder were both discolored black, indicating overheating. No obstructions or anomalies were detected in the lubrication system that could explain the failure.
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