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In aeronautics, a spoiler (sometimes called a lift spoiler or lift dumper) is a device which increases the drag and decreases the lift of an airfoil in a controlled way. Most often, spoilers are hinged plates on the top surface of a wing that can be extended upward into the airflow to spoil the streamline flow.
Often, characteristics of both spoilers and air brakes are desirable and are combined - most modern airliner jets feature combined spoiler and air brake controls. On landing, the deployment of these spoilers ("lift dumpers") causes a significant reduction in wing lift, so the weight of the aircraft is transferred from the wings to the undercarriage.
Air brakes are used to increase drag. Spoilers might act as air brakes, but are not pure air brakes as they also function as lift-dumpers or in some cases as roll control surfaces. Air brakes are usually surfaces that deflect outwards from the fuselage (in most cases symmetrically on opposing sides) into the airstream in order to increase form ...
The FAA publicly identified an “unsafe condition” that could result in a “loss of control” of certain Boeing 737 Max jets because of “nonconforming” installation of spoiler control wires.
Air brakes are inboard spoilers, I don't think there should be just a hard and fast differentiation between air brakes and spoilers. When you are airbraking on the ground you extend both inboard and outboard spoilers, (or the armed hydraulic system does, after it detects weight on wheels in an airliner), if you are spoiling off speed in the air ...
Spoilerons roll an aircraft by reducing the lift of the downward-going wing.Unlike ailerons, spoilers do not increase the lift and drag of the upward-going wing. A raised spoileron increases the drag on the down-going wing where it is deployed, causing the aircraft to yaw in the direction of the turn.
On DC-8s, spoilers are used after landing only (i.e. ground spoiler). Few methods can be used to reduce speed in flight (e.g. before landing), such as deploying the thrust reverser of inner engines on both port and starboard side. Other accidents attributed to accidental deployment of ground spoiler in flight have also occurred. As a result ...
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