I fresh idea. I shall paint a half dollar size green dot in the wheel down and locked position and a red square in the wheel retracted position. Less confusing than arrows or just color, square does not roll.

It was not until my most recent BFR that the instructor was requiring a visual check of the airbrakes and also required the airbrakes to be check full open as he explained there have been several incidents where the airbrakes became locked in the full up position. So now I check the airbrakes in the fully deployed position where if they became locked in the full up I could still make some type of pattern to land. I also added a tubular gauze to the airbrake handle to change the tactile feel from the flaps.