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The corresponding characteristic quantities for the economic lifetime-method are Numerical exaniple: Let be C = GYOO, B = 626 and a + b Figure 1 shows the per cent gain 2If u is sufficiently large this gain exceeds 25%! For the same average repair cost development and replacement cost as in this exaniple the application of optimum repair limit8 for each repair instead of using the economic lifetime leads to cost savings coming t o 6% [ 2 , 3 ] . &,-c Fig. 1. Cornparision of effectivity of repair limit replacement policy and economic lifetime method K e f e r e n c e s 1 BEICHELT, I?., Effektive Planuiiy prophylaktischer MaDnahmen in der Iustandhaltung, Berlin, VEB Verlag Technik 1979. 2 BEICHXLT, P.; FISCHER, K., General failure model applied to preventive maintenance policies, IEEE Trans. on Reliability R-

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