Radar Data
Radar information showed the airplane climbing to an altitude of 7,800 feet, then leveling off at 7,700 feet for approximately one minute before entering a descent. The radar data was processed through a computer program, which calculated the highest vertical speed recorded at 19,000 feet per minute, with a true airspeed of 279.9 knots (321.9 miles per hour).
Airframe Examination
Evidence of flutter was found on the elevator, which had separated from the horizontal stabilizers. The wings had failed symmetrically due to negative loading.
Pilot Medical Information
The pilot had been taking Vasotec for hypertension.
Flight Test Data
Data from subsequent flight testing indicated that if the airplane was trimmed for a climb at 112 miles per hour, and the power was not changed, applying a 13-pound forward force on the control wheel would cause the airplane to accelerate to 196 miles per hour. The never-exceed speed for the airplane is 200 miles per hour.