Abstract
Since 1996, Reduced-gravity experiment flight by Gulfstream-II (G-II) airplane has been carried out for the large sized or more electric power system experiment. For the life science or medical area scientist requirement, Diamond Air Service Inc. has been studied to modify the interior of G-II cabin for -Free Space Style- and the modification plan was approved by Civil Aviation Bureau of Japan this time. Up to this time, scientists and subjects need to fasten their seatbelt during the reduced-gravity experiment flight in Japan; notwithstanding they are conducting the free space training or experiment with unfastened condition in U.S.A., Russia, and France. This paper introduces outline of modified G-II airplane in hard and soft area for ''Free Space Style'' specification. And it will assure the good free space environment for manned reduced-gravity experiment flight training and medical or life science conditions such as standing, sitting, and reclining positions or free floating condition.
