At about 13:30 PST, a Cessna 152 crashed in mountainous terrain near Rancho Cucamonga, killing the pilot. The aircraft had been rented for a local area personal flight. The flight had originated at Cable Airport in Upland, at about 13:00. A witness who was located about -mile south of the accident site said the airplane was descending northeast at 45-degree angle with high engine power. The witness said the airplane was not spinning or turning during the descent. He lost sight of it as it passed behind terrain. The wreckage was located on a 60-degree canyon wall about 3,000 feet msl and about 5 miles northeast of Cable Airport in Cucamonga Canyon.