Hinge mechanism is a widely used motion mechanism in civil aircraft. The reasonable maintenance interval plays an important role in ensuring the safety and economic operation of aircraft. In order to ensure the rationality of the maintenance interval of hinge mechanism, the maintenance interval of hinge mechanism is proposed based on MSG-3. Firstly, the relevant contents of MSG-3, airworthiness provisions and national military standards are analyzed in detail, which provides the basis for the reasonable formulation of maintenance interval of hinge mechanism. Secondly, the influencing factors of maintenance interval are analyzed, and a relatively complete method and process of making maintenance interval of hinge mechanism are determined. Finally, taking the maintenance interval of flap hinge mechanism of a certain type of aircraft as an example, the feasibility of this process and method is verified, and the maintenance interval of the hinge mechanism is determined, that is, the inspection threshold and repeated inspection interval of accidental damage and environmental damage are 5 calendar years, the inspection threshold of fatigue injury is 24000 FH, and the repeated inspection interval is 14400 FH. The proposed method can provide support for the reasonable formulation of aircraft maintenance interval and maintenance program.