Preliminary reports have been released by the National Transportation Safety Board into a fatal plane crash last month at the Cameron Air Show.

As we previously reported, on June 27 around 1:53 p.m. 50-year-old pilot Steven O’Berg was injured when his Pitts biplane crashed during a performance at the air show. He was transported to the hospital where he died.

A cause of the crash was not indicated in the report. However, the report did indicate that the crash took place during a planned maneuver.

“Video recordings taken by persons on the ground showed the airplane flying through the planned routines,” the report stated. “Between the eighth and ninth aerobatic maneuvers, the videos showed the airplane doing a course reversal, and then flying straight and level before entering into a knife-edge climb. During the knife-edge climb, the airplane appeared to enter the Lomcevak maneuver by doing a climbing snap-roll to the left. Then the nose of the airplane pitched down and the airplane tumbled two times to the left while descending. The airplane appeared to enter a left spin and completed about two and a half revolutions before it impacted the terrain.”

The report found that flight control continuity was confirmed from all flight control surfaces to cockpit controls.

NTSB said the engine will be shipped to the manufacturer for an engine teardown examination. The videos and still photographs of the accident flight will also be examined at the National Transportation Safety Board’s (NTSB) Vehicle Recorder laboratory.