Sliding hangar doors are bottom load-bearing and top guide structure. 

• A variety of structures: single track, double tracks or multiple tracks; double leaves or multiple leaves.
• Flexible and varied running modes: one side moving, bilateral moving; with/without door pocket; single leaf moving or several leaves jointly moving is also possible.
• Limit device and safety protection devices are given to prevent collisions between door leaves for personnel and objects safety.

Sliding hangar doors are the most widely-used doors in aircraft maintenance hangars and aircraft equipment factories.