Is it required? No. I am not sure, but perhaps the only purpose of the cover is to keep the lense from getting scratched or dirty. When i first got my Air, i kept forgetting to take it off, and kept on getting the overload error so I decided to just keep the cover off. However, I chose to start using it again simply because you never know if you're ever going to bump it so having that little extra protection may be there when you might need it. I also think (but I am not an engineer so this is simply my personal guess) that maybe the cover keeps the gimbal motors from rattling around when it's not being used, which may protect the motors..but again, that's just a guess.