Went down just before 10:00 hours at the Barry M. Goldwater range, about seven miles south of Gila Bend, Arizona. The student pilot, First Lieutenant Esther Obert, radioed that she was having aircraft problems. She was in a three ship formation. Esther ejected shortly after. All Luke AFB F-16's were grounded for safety checks. Cause of the crash was numerous cracks in the afterburner wall which caused fire to spread.