Upside Down You’re Turnin’ Me: The Diamond DART-550 Takes its First H75-A Powered Flight The new aerobatic H-Series engine powered its first flight test on the Diamond Aircraft DART-550. Tags aerobatic flight business aviation diamond dart 550 ge aviation h-series GE H75-A general aviation H-Series Read more about Upside Down You’re Turnin’ Me: The Diamond DART-550 Takes its First H75-A Powered Flight