Aeronautical development activities aim to obtain the type certification, changes to type certification, supplemental type certification or the approval of repair design. The development process and verification that the development meets the applicable and respective valid requirements and specifications as well as the manufacture of the components involve major effort.

As soon as aircraft, aeronautical products, components and appliances are released for operation, it must be ensured that their airworthy condition is being maintained at all times during operation. For this purpose aircraft and their components are regularly checked and maintained.