Which area on the airfield is mentioned as permanently closed and unusable?

The unnamed taxiway is identified as permanently closed and unusable, indicating that it is no longer part of the operational airfield infrastructure. This closure could be due to various reasons, such as safety concerns, maintenance issues, or redesign of the airfield layout. As a result, aircraft cannot use this taxiway for movement, which impacts ground operations and planning for both pilots and ground control teams.

In contrast, the other areas listed have specific functions that remain essential to airfield operations—like the main runway being crucial for takeoffs and landings, the fuel storage area being necessary for fueling operations, and the hangar area serving as maintenance and storage for aircraft. These locations are integral to the airfield’s functionality and operations, distinguishing them from the permanently closed taxiway.