On August 24, 1994, a Champion 7FC (registration N7598B) was involved in an aviation accident near Tacoma, WA. Investigators recorded the probable cause as: Arteriosclerotic cardiovascular disease was a contributing factor. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.
Witnesses observed a low-flying airplane enter a gradually increasing left bank before the nose dropped and it impacted terrain. Investigation found no mechanical failure, but autopsy revealed pre-existing cardiovascular disease as a contributing factor.
Accident Sequence
According to witness statements, the airplane was operating at a low altitude when it initiated a shallow left bank. The bank angle progressively increased. Subsequently, the nose of the airplane lowered and the airplane struck level terrain. The impact attitude was with the left wing and nose low.
Post-Crash Examination
Investigators conducted a detailed examination of the wreckage. No preimpact mechanical failures or malfunctions were identified. An autopsy was performed on the pilot. The autopsy revealed evidence of prior bypass surgery and arteriosclerotic cardiovascular disease. The coroner's report noted that arteriosclerotic cardiovascular disease was a contributing factor to the accident.
Concluding Remarks
The investigation did not uncover any mechanical issues that could have led to the loss of control. The medical findings indicated a preexisting cardiovascular condition.
Probable cause
Arteriosclerotic cardiovascular disease was a contributing factor.
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