As far as I remember from the POH, the ASK21, once registered in A (Aerobatic) catogory, provided with 5-point seat belts, pedals straps and a g-meter, is cleared for most aerobatic maneuvers, excluding inverted loops, tail slides and snap rolls.
It is cleared for sure for loop, fiesler, airleon roll, lazy eight, chandelle, inverted flight.
It is cleared for intentional spin even in "U" (utility) category.
I routinely flight on a aerobatic ASK-21, but I'm not (yet
) rated for aerobatic manouvers
