Investigators were unable to determine the cause of a plane crash that killed two Oklahoma State women's basketball coaches in 2011.
The National Transportation Safety Board report released a probable cause report on Wednesday saying investigators could not determine why the pilot lost control of the aircraft during the Nov. 17, 2011, flight from Stillwater to Little Rock.
OSU head women's basketball coach Kurt Budke and assistant Miranda Serna died along with Olin Branstetter, 82, and his wife Paula Branstetter.
Branstetter was piloting the plane as part of a recruiting trip to Arkansas.
An earlier report found the plane had been inspected about a week before it crashed.
Investigators have said most of the plane's cockpit instruments were unreadable, unreliable or destroyed in the crash.
As a result of the crash, the university adopted new travel policies in November 2012.
OSU had a specific Team Travel policy, but coaches were able to use their own discretion when traveling for University business like the recruiting trip Coach Budke was on in November 2011.
The new policy outlines travel requirements for travel by motor vehicle, public, charter and private aircrafts.
Private aircrafts must be approved through the policy and the pilots must fulfill certain requirements for the types of aircrafts they are flying.
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