There are two prominent speed brakes on the sides of the rear fuselage.
They are not overtly complicated, but do require studying the graphics before building it. To me, I was surprised to see the realy tiny parts that I just can't cut or assemble, and as usual some parts will not or barely be seen once installed.
Here are the brake surfaces
There is an elaborate link mechanism inside. I eliminated the small tiny parts.
The fuselage opening here. Note the hole, it is for the hydraulic actuator. After evaluating this, I decided to eliminate that part because it is barely visible.
Air brakes installed.
I like it!
Isaac