"Circulation-controlled anti-torque or circulation-controlled directional control systems";

Cat 7 "Circulation-controlled anti-torque or circulation-controlled direction control systems"

Cat 7 “Circulation-controlled anti-torque or circulation-controlled direction control systems”

e. Computer-aided-design (CAD) "software" specially designed for the "development" of "active flight control systems", helicopter multi-axis fly-by-wire or fly-by-light controllers or helicopter "circulation controlled anti-torque or circulation-controlled direction control systems" whose "technology" is controlled in 7.E.4.b., 7.E.4.c.l. or 7.E.4.c.2.