roll spoiler

Instead, the ailerons were reduced in size to allow more flap area, and were augmented with two sets of roll spoilers, or "spoilerons".

Upon touchdown, both the inboard and outboard roll spoilers extend in unison to aid in destroying lift created by the wing.

The aircraft also employs two ground spoilers per wing, and two roll spoilers per wing.

The control surfaces consisted of a conventional rear rudder, elevator, and a pair of roll spoilers on the wings - all activated by a divided control yoke.

On large aircraft where rudder use is inappropriate at high speeds or ailerons are too small at low speeds, roll spoilers can be used to minimise adverse yaw or increase roll moment.

The inboard roll spoilers operate at all speeds while the outboard roll spoilers only operate at speeds less than 130KIAS to allow for more roll control at slower speeds.

The roll spoilers' primary job is to augment the ailerons however upon touchdown all four roll spoilers activate along with all four ground spoilers to spoil much of the lift generated by the wing.