 All four of the primary flight control surfaces were actuated by a quadruple-redundant electro-hydraulic control unit, designed by Boulton Paul.Fly-by-wire electrical controls and automatic control systems were also to be employed on the type.The undercarriage, designed by Dowty Group, used an arrangement of a single centre-fuselage main unit complete with four wheels, a nose unit with two wheels, and a pair of outriggers located on the engine nacelles.