3. ຮ້ອງຂໍໃຫ້ມີການປະຕິຮູບໃນລະຫວ່າງການປັບປຸງສ້ອມແປງເຄື່ອງສີດ, overhaul means that the equipment is severely worn or damaged, and the mechanical performance is significantly reduced. The ເຄື່ອງສີດ manufacturer warns everyone that overhaul should be carried out in accordance with the regulations: the mechanical power performance is significantly reduced, the fuel consumption increases, the operation is invalid, or the abnormal audio equipment cannot display normal production performance. Therefore, a comprehensive and thorough repair method must be adopted. Repairs also need to arrange a work schedule. In the process of reconstruction, there will be scraps, and professional maintenance personnel will be responsible for implementation. Records and acceptance are required. Provide overhaul acceptance certificate before installing multiple or close to discarded equipment, and record the scrap status at the same time.