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MIL-STD-781 D CONTENTS Page Paragraph 1. SCOPE 1 1.1 Purpose 1 1.2 Application 1 1.3 Equipment categories 1 2. REFERENCED-DOCUMENTS 2 2.1 Government documents 2 2.1.1 Standards and handbooks 2 3. DEFINITIONS 3 3.1 Terms . 3 3.1.1 Contractor 3 3.1.2 Corrective maintenance (repair) . . 3 3.1.3 Decision risks 3 3.1.3.1 Consumer's risk (/9) 3 3.1.3.2 Producer's risk (a) 3 ^ 1 ^ O nlr^rlminntlnn ratin tA \ 1 J, I t^t J I/I9VI IIIIIIIOUVII I QIIW / Hi 3.1.4 Failures 3 3.1.4.1 Multiple failures 3 3.1.4.2 Pattern failures 3 3.1.4.3 Chargeable failure 3 3.1.5 Failure categories 3 3.1.5.1 Equipment design failure 3 3.1.5.2 Equipment manufacturing failure 3 3.1.5.3 Part design failure 3 3.1.5.4 Part manufacturing failure 4 3.1.5.5 Software error failure 4 3.1.6 Measures of reliability 4 3.1.6.1 Demonstrated MTBF interval (fld) 4 3. J.6.2 Observed MTBF {$) 4 3.1.6.3 Lower test MTBF (0i ) 4 3.1.6.4 Upper test MTBF [So) 4 3.1.6.5 Predicted MTBF ) 4 3.1.6.6 Observed cumulative failure rate (P(t)) 4 3.1.6.7 Intensity function (P(t)) 4 3.1.6.8 Instantaneous MTBF function (M(t)) 4 3.1.6.9 Observed reliability (R(t)) 4 3.1.7 Mission profile 4 3.1.8 Life-cycle profile 4 3.1.9 Procuring activity 5 4.. ' GENERAL REQUIREMENTS " . . . 6 4.1 Reliability test program 6 4.2 Integrated reliability test planning 6 4.3 Environmental test conditions . . . ~ 6 IV

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