NTSB Probable Cause

THE PILOT'S FAILURE TO MAINTAIN A SAFE ALTITUDE ABOVE THE GROUND DURING AN INTENTIONAL LOW ALTITUDE FLIGHT IN MOUNTAINOUS TERRAIN. CONTRIBUTING FACTORS RELATED TO THE PILOT BECOMING DISTRACTED WHILE FLYING OVER THE GROUND AND TO HIS FAILURE TO INITIATE A CLIMB OR TAKE OTHER CORRECTIVE ACTION BY ALTERING HIS COURSE IN A TIMELY MANNER TO AVOID COLLIDING WITH THE MOUNTAIN.