CORONIAL LAW - cause and manner of death, aviation fatality, de Havilland Canada DHC-2, Jerusalem Bay, Sydney Seaplanes, Airag Aviation Services, floatplane, engine exhaust system, magneto access panels, magneto cooling tubes, firewall breach, AN3-3A bolt, carbon monoxide exposure, ingress of carbon monoxide into aircraft cabin, chemical spot detectors, on board recording devices, recorded flight data, Australian Transport Safety Bureau, Civil Aviation Safety Authority