NTSB Probable Cause

THE PILOT'S FAILURE TO MAINTAIN AN ALTITUDE SUFFICIENT TO AVOID COLLIDING WITH TERRAIN WHILE PERFORMING ACROBATIC MANEUVERS AS A RESULT OF HIS ALCOHOLIC IMPAIRMENT OF EFFICIENCY AND JUDGEMENT. FACTORS CONTRIBUTING TO THE ACCIDENT WERE: THE PILOTS DISREGARD OF THE AIRPLANE'S OPERATING LIMITATIONS WHICH PROHIBITED ACROBATIC FLIGHT, AND HIS LACK OF EXPERIENCE AND TRAINING FOR THE TYPE OF OPERATION BEING CONDUCTED.