At present, there are some problems in air force aviation equipment maintenance management, such as failure model being under-optimization, maintenance clearance being difficult to be accurate, etc. this paper focuses on technologies such as multi-source flight data integration, equipment reliability modeling, and preven- tive maintenance gap management. A preventive maintenance clearance calculation method based on Weibull distribution is introduced. Finally, the vertical gyro is used as an example to verify the method. Results show that the method can save equipment maintenance cost and improve equipment availability.