In my opinion this falls under the heading of personal responsability and not legislated by someone else's idea of a rule. What this means is that you will have to leave the canopy off your aircraft at all times or install an arming plug on the exterior. So in effect they are telling us we will have to have an arming plug as it is not practical to not have our our very light canopies not secured. So at the nats or other fields where your car is not readily available your going to have to carry the canopy or devise some other method to secure it. It was my understanding being able to demonstrate a fail safe kill to ecu by the tx would surfice as meeting the rule. Now I learn that is not the case and by default this WIIL require an external arming plug. I am totally against this and ask that anyone who feels as I do call or write AMA and your district rep and let him know how you feel. For sure the "Devil" is in the details on this rule!
Dick