The optimization of maintenance intervals of civil aircraft involves the reliability, maintainability, and operating costs of onboard equipment, and it is also an important research direction that is of common interest to the airline companies, the main research units, suppliers, and so on. By collecting basic reliability data and operational reliability data of aircraft equipment and analyzing them statistically, the Weibull life distribution model of the equipment is derived. Based on this model, the average life of the equipment is statistically derived, and the inspection interval of the equipment is determined and optimized through comparative analysis.