This study developed a robotic online simulation platform (i.e., IRobotQ3D) for K-12 education, which realized several main fundamental functions, such as the three-dimensional (3D) structure design of the robot, a combination of components, graphical programming, and motion simulation. Based on the

To formulate a plan of maintenance, the key aspect is to determine the maintenance intervals, as the maintenance types and maintenance intervals of each system are provided in the maintenance plan, and the types of each system are usually fixed. In this paper, the using data of aircraft components was employed to determine the maintenance interval. The least-squares method was adopted to estimate the Weibull distribution parameter. Then, the maintenance task interval model was set up. At last, the method was verified by using the reliability data of landing gear in in CESSNA172R.