ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-BfbMufyDD6c.html ; F-18 Ala12🇪🇸 / #FestivalAereoGijon , varios Vídeos más de jornada muy chulo los vuelos de Aviones y Helicópteros
He's letting the pilot know to run the BIT (Built In Test) that will check all of the systems. You see the flight controls run through their test right after that.