A tricycle landing gear with steerable nosewheel was envisioned. Rudder pedals are linked to the steerable tailwheel. The tail wheel was both retractable and steerable. AMCA would be equipped with an AESA radar mounted on a mechanically steerable mount. The fixed tailwheel is not steerable and full-swivelling. These are used to drive two steerable azimuthing thrusters, with a bow thruster supplementing. It had powered rear wheels with a ringed steel and solid rubber, steerable front wheel. Some types also use steerable propellers or ducted fans. A powered, steerable aerostat is called a "dirigible". Cassini's main engine nozzles were steerable. With steerable antennas, it was also used for Gun Control. These tools are referred to as rotary steerable systems (RSS). Paragliders use a special type of steerable parachute for a wing. Satellites in elliptical/eccentric orbits must be tracked by steerable ground stations. It was immediately recognized that a steerable, or dirigible, balloon was required.