In this paper, the availability analysis for repair rate of critical aircraft components such as aircraft engine, propeller and avionics under Performance based logistics (PBL) have been examined. The concept of Performance based logistics (PBL) is employed to enhance the system availability. Weibull distribution is used to analyze the system availability. The objective of this article is to provide an instrument for normative decision making for contracting military logistic services as well as to improve the capacity of repair facilities. Desired availability of critical aircraft components can not be achieved without repair. The numerical illustrations are carried out to highlight the effects of repair rate and failure rate for aircraft components by considering different parameters of availability, probability density function of repair rate and cumulative distribution function of repair rate which validate our results.