In 2007, Shenyang Baotong Door Industry Co., Ltd. undertook the construction of the hangar door of the famous J-10 aircraft. The door is 82.8 meters wide and 9 meters high, and is in the form of a stacked hangar door. In this project, Baotong professionally developed and adopted the overall lifting arm technology, which successfully solved the technical problem of the large span of the door body, while effectively reducing the weight of the door body structure and improving the wind pressure resistance of the door body.