Uncertain block replacement policy with no replacement at failure

The block replacement policy with no replacement at failure means that a unit is always replaced at fixed time, but not replaced at failure. In this paper, the lifetime of the unit is assumed to be an uncertain variable, the model of expected cost per unit time following no replacement at failure policy is proposed, and the existence condition of the optimal replacement time is given. Furthermore, the optimal block replacement policy of a system consisting of multiple units which operate independently of each other is discussed. At last, a numerical example on the maintenance management of spare parts in civil aviation is provided to illustrate the effectiveness of the proposed model.