An aircraft is considered airworthy if all its properties are such that it can be safely used for aviation. To ensure this, the aircraft must be appropriately designed, manufactured, equipped and maintained to comply with the applicable requirements. Responsibility for airworthiness always belongs to the owner, possessor or operator of the aircraft.
In line with European Union legislation – with the exception of private aviation – airworthiness is now monitored using more indirect methods. Instead of aircraft annual inspections, Trafi inspects and approves the organisations performing airworthiness reviews in accordance with regulations issued by the European Aviation Safety Agency, EASA.
In practice, major airlines take care of the airworthiness of their aircraft themselves. Trafi approves the maintenance organisations of these companies, oversees their maintenance agreements and monitors the aircraft maintenance programmes.