The 2012 crash killed Ron Bramlage, his wife and their four children.
The report shows parts of both wings broke off in mid-air but the exact cause of the crash is still unknown.
A probable cause on the crash is expected to take six to eight weeks.
A preliminary NTSB reports shows Ron, who was piloting the plane, changed course to avoid bad weather when the plane began to quickly lose altitude.
The family was on their way back to Junction City from the Bahamas when the plane went down in Florida.
Ron is the grandson of Fred Bramlage who is the namesake for Bramlage Colliseum at Kansas State University.
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