The wings were braced by a Warren truss. Automatic slots are fitted to the top wing, the auxiliary airfoils of which benefiting from a new construction approach involving single z-section spars and planking, both composed of duralumin. Slot-type ailerons are also present, each being installed upon four hinges and supported by four box-section brackets; these ailerons are both statically and aerodynamically balanced, making them relatively light to control. Inboard of the lower engines, the lower wings slope upwards to pass above the fuselage rather than through it, thus keeping the spars from obstructing potential cabin space. Both the elevators and ailerons are controlled via a large diameter Y-tube; the core controls being duplicated. The tailplane was of a biplane configuration, being furnished with three separate fins.