You can apply them any time during your landing approach. I usually kick them in on final unless the plane is going to be a bit short of the field. Not everyone subscribes to the airbrake practice. You should try it for yourself and see what you think. I use the "Land" switch on my radio.
Regards,
Eric.
ORIGINAL: handglider
Hi Eric,
tell us more about the airbrake - 5° of up aileron - do you apply on final or during the entire landing approach?
thanks in advance, dean