To make a structural repair, the aircraft technician needs a good working knowledge of sheet metal forming methods and techniques. In general, forming means changing the shape by bending and forming solid metal. In the case of aluminum, this is usually done at room temperature. They are responsible for the maintenance and repair of aviation life support equipment, aircraft structures and related components. Aircraft Structures Technicians are skilled in metal and composite repair, refinishing, painting, machining and welding. The market for the Aircraft MRO sector is typically divided into four major segments, which include Airframe heavy maintenance and modification, Engine maintenance, Line maintenance and Component maintenance.