There are 4 spoilers on each wing upper surface.3 lift spoilers & 1 roll spoiler,all hydraulically powered.. .The lift spoilers are for ground use only,and are selected by a combined 'Airbrake'/'Lift Spoiler'lever.. .The'Airbrake'is the pair of vertically separated petals located at the split tail cone.. .On approach for landing the Airbrakes can be selected to any position between IN or OUT using the lever located on the central console,this provides for a 'Thrust'vs'Drag'configuration leading to a 'Stable' approach.. .After touchdown,the lever is moved rearwards thro'a detent into the 'Lift Splr' position.. .The 6 spoiler panels are then raised to destroy the remaining lift generated by the wings,and allow the full weight of the aircraft to settle on to the maingear,so assisting the breaking effort.