The AMA Safety Code Rule number 4: I will not fly my model in sanctioned events, airshows and model demonstrations until it has been proven airworthy. seems perfectly clear to me. If some CD chooses not to enforce it that is his problem. If someone has a problem with that there are procedures that can be followed to report the infraction. Arguing the issue for 56 posts seems to be more recreational than anything else.. What isn't clear to me is how points contesting can be both "unconvincing and unexistant."