 The aircraft, a veteran of World War II, broke in two and caught fire on impact.Of the 48 on board, 22 were killed, including both pilots, 16 players, a student manager, and a Cal Poly football booster.The Civil Aeronautics Board (CAB) investigated the accident and concluded that the aircraft had been overloaded by above its maximum certificated gross takeoff weight of and that there was a partial power loss in the left engine prior to the crash.