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MIL-HDBK-338 15 OCTOBER 1984 1. MTTR and Repair Rate MTTR = Mct = jg = 80 minutes u (repair rate) = = = 1/80 = 0.0125 repairs/minute Mct 2. Maintainability Function for 100 Minutes M(100) = 1 - e-"t = 1 - e-(0.0125) (100) = i . e-1-25 = 1 - 0.286 = 0.714 or a 71% probability of meeting the warranty requirement 3. Median Time to Repair Mct = 0.69 Mct = (0.69) (80) = 55.2 minutes 4. Time within which 95% of the Maintenance Actions can be Completed Mmaxct = Mo.95 = 3 Mct = 3 (80) = 240 minutes 5.3.2.4 EXPONENTIAL APPROXIMATION In general, the repair time density function is lognormally distributed. In practice, however, the standard deviation of the logarithms of repair times (

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