https://rotor.org/proposed-faa-ad-leonardo-s-p-a-model-ab139-and-aw139-helicopters-with-certain-main-rotor-blades-mrb-installed/ The global leader in leveraging, innovating, advocating, and expanding vertical flight Wed, 16 Jun 2021 05:35:42 +0000 hourly 1 https://wordpress.org/?v=6.2.2