The Conroy Tri-Turbo-Three was a Douglas DC-3 fitted with three Pratt & Whitney Canada PT6A turboprop engines by Conroy Aircraft; the third engine was mounted on the nose of the aircraft.
It was instrumental in opening up the interior of Antarctica to private expeditions and tourism. Most notable was a 1983 expedition transporting eight members of the Seven Summits expedition, plus a crew of three, to the Antarctic for a first-ever assault on Mount Vinson.
