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Spoilers are control surfaces which spoil the lift and increase the drag of a wing by disturbing the airflow around it.
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What determines spanwise placement of spoilers for roll control?
On airliners, spoilers serve three purposes, roll enhancement (assist the ailerons when greater roll rate is commanded), speed brakes (help slow down and descend faster), and ground spoilers (kill lift … Also, the outboard spoilers are primary for roll control and the most inboard spoilers may only be used on the ground. …