What factories does Yuhuan Kanmen do as an aviation processing factory?

Yuhuan Kanmen Aviation Processing Factory has these factories:

1, Yuhuan Tianrun Aviation Machinery Manufacturing Co., Ltd., located in the northwest of Haidu Garden, Yuhuan City, Taizhou City, manufactures locking mechanisms for helicopter doors, including locking mechanisms for cockpit doors, sliding doors and power cabin fairings;

2. Yuhuan Shuanghuijian Aviation Equipment Co., Ltd., located in Kanmen Street Science and Technology Industrial Park, Yuhuan City, Taizhou City, is mainly engaged in aircraft parts manufacturing and aviation equipment technology research and development services.