Calculations of Amounts of Joint Reserve of Airplanes in Civil Aviation Systems

In this paper, based on the "airplane repairing" model and "airplane purchasing" model, for the N systems of single unit from different airline companies where reserve of airplanes starts at the same time under the same storage conditions that normal probability is not less than P0 during the designed storage period T0, the spare parts number M for N identical systems is derived. According to the same principle, ideas of joint reserve of airplanes have been proposed, and the validity has been checked through the examples of Weibull distribution.