On July 18, 1993, a Champion 7KCAB (registration N11AT) operated by Super, Billy M. & Bernice I. was involved in an aviation accident near Hill City, KS. Investigators recorded the probable cause as: the loss of engine power for an undetermined reason and the pilot's decision to continue flying the airplane with known deficiencies. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.
A banner-towing aircraft experienced an engine failure after a low pass, entering a steep left turn and descending nose-down. Witnesses reported rough engine operation throughout the morning, but postaccident examination found no preimpact mechanical anomaly.
Accident Details
According to witness statements, the accident aircraft was engaged in banner-towing operations during the morning hours. It made a low pass from north to south along the runway and released the banner it was towing. The pilot then added power and initiated a left climbing turn.
Engine Failure and Descent
Witnesses estimated the aircraft was between 50 and 150 feet above ground level when the engine sputtered and quit. Subsequently, the aircraft entered a steep left turn and pitched nose-down toward the ground.
Witness Observations
Throughout the morning, witnesses reported that the aircraft's engine seemed to be consistently running rough, characterized by coughing and sputtering. The engine had been performing in this manner during the banner-towing operations prior to the accident.
Postaccident Examination
A postaccident examination and engine runup were conducted. The inspection revealed no evidence of any preimpact mechanical anomaly.