Editing Flight control surfaces (section)

=== Spoilers ===
{{Main|Spoiler (aeronautics)|Spoileron}}
[[File:747-8I-trailing-wing-surfaces.jpg|thumb|right|Wing trailing edge flight control surfaces of a [[Boeing 747-8I|Boeing 747-8]]. Top left: All surfaces at neutral position; Top middle: Right [[Adverse yaw|aileron]] is lowered; Top right:  [[Spoiler (aeronautics)|spoilers]] raised during flight; Middle row: Fowler flaps extended (left), extended more (middle), hinged with inboard slotted part hinged even more (right); Bottom row: spoilers raised during landing]]
On low drag aircraft such as [[sailplanes]], [[Spoiler (aeronautics)|spoilers]] are used to disrupt airflow over the wing and greatly reduce lift.  This allows a glider pilot to lose altitude without gaining excessive airspeed. Spoilers are sometimes called "lift dumpers". Spoilers that can be used asymmetrically are called [[spoileron]]s and can affect an aircraft's roll.