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Not really a door. Sorry for using a bad metaphor. On the outside of the aircraft there are removable panels that need to be taken off for service and maintenance. At first glance they look like they are attached by standard flathead screws, but they aren't that. They only have a limited amount of travel from locked to open. They also stay attached to the panel. Good for keeping them out of jet engine intakes. Yes you could open and close them with a proper fitting screw driver but the tool in the OP could be termed the "official tool". This probably doesn't help much. This is an instance where the right picture would be worth at least a thousand words. If I come across one I'll share.