MIL-HDBK-781A Reliability Test Methods Plans and Environments 1 Apr 96

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MIL-I1DBK-781 TABLE IXA. (1-y) IQQ percent standard confidence limits on MTBF after accept HeHsinn (lower - (y. i)). (Continued) LOWER CONFIDENCE LIMITS FOR MTBF 6 ON THE ACCEPTANCE BOUNDARY TEST PLAN II1-D d = 2,0. a = 0 = 0.10 NUMBER OF TOTAL FAILURES TEST TIME y = .50 y = .30 y = .20 y = .10 y= .05 (i) 0 4.40 6.3479 3.6546 2.7339 1.9109 1.4688 1 5.79 3.3364 2.2913 1.8638 1.4311 1.1704 2 7.18 2.5435 1.8741 1.5790 1.2633 1.0627 J 9 < 7 i 7on 1 "71 " I .N I I nai 1 AAAA 1 .WBU J u.^u X. 1 /07 m/ii 1 .HJ /Z 1. I /OJ 1 AAAA 1 .WBU 4 9.94 1.9708 1.5521 1.3532 1.1278 .9760 5 11.34 1.8385 1.4754 1.2992 1.0956 .9559 6 12.72 1.7466 1.4218 1.2614 1.0734 .9424 7 14.10 1.6799 1.3827 1.2339 I ni7? 1 .VW f 0770 7 8 15.49 1.6300 1.3535 1.2135 1.0459 .9262 9 16.88 1.5916 1.3311 1.1980 1.0372 .9213 10 18.26 1.5613 1.3135 1.1858 1.0305 .9177 11 19.65 1.5371 1.2995 1.1763 1.0254 .9150 12 20.60 1.5112 1.2839 1.1654 1.0194 .9117 13 20.60 1.4661 1.2530 1.1418 1.0045 .9026 14 20.60 1.4173 1.2163 1.1120 .9835 .8882 15 20.60 1.3755 1 1.1825 1.0830 .9613 .8715 LOWER CONFIDENCE LIMITS FOR MTBF 9 ON THE ACCEPTANCE BOUNDARY I tS I PLAN" IV-D d = 2.0, a = p = 0.20 NUMBER OF FAILURES /: \ U ) TOTAL TEST TIME y = .50 y = .30 y = .20 y= .10 y = .05 0 2.80 4.0395 2.3256 1.7397 1.2160 .9347 1 4.18 2.3277 1.5933 1.2927 .9880 .8042 2 5.58 1.8907 1.3822 1.1581 .9181 .7650 x a OA V./V 1 AOOC 1 .V / / */ 1 7BA< 1 1 AQ/CC 1 .V7UU esxo .ODU7 7/10< . 'TOJ 4 8.34 1.977 1.2351 1.0643 .8710 .7407 5 9.74 1.5385 1.2054 1.0459 .8626 .7368 6 9.74 1.4486 1.1502 1.0066 .8403 .7245 7 Q 74 1.3763 ! .0986 .9662 .8133 .7069 1.3763 ! .0986 .9662 .8133 .7069 114

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