 Subsequent investigations found that crew fatigue, mechanical failures resulting from incompetent maintenance, and poorly trained pilots lay behind each disaster.In one case the crew had been flying without rest for more than 25 hours; in another the pilot had failed his flight test three times.These needless—and widely publicized—tragedies bore heavily upon the House representatives and senators as they crafted Public Law 87-528, passed on 10 July 1962.