ih, as the post i wrote you in "Problem with gears system"
this one can't be taked down up to 300 knots.

when landing you should do this semplificated procedure:

-airbrake: keep speed at 250 knot circa
-flaps on land (f8)
- gear down

(runway should be touched at 210 knot whit flaps down)

after that,
-flaps on take of
use dragchute and brake

hope it can help :)