MIL-STD-1916 DOD Preferred Methods for Acceptance of ProductThe purpose of this standard is to encourage defense contractors and other commercial organizations supplying goods and services to the U.S. Government to submit efficient and effective process control prevention procedures in place of prescribed sampling requirements.

Pages 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 - 15 - 16 - 17 - 18 - 19 - 20 - 21 - 22 - 23 - 24 - 25 - 26 - 27 - 28 - 29 - 30 - 31 - 32 - 33

MIL-STD-1916

APPENDIX

sampling plans from Table II. Lot sizes may vary as a result of production decisions. A

segment of the producer's experience is shown in figure 1.

30.2 Variables sampling (single-sided specification limit case). The maximum temperature of operation for a certain device is specified as 209 (measured in degrees F). Verification level I (VL-I) has been specified. A lot of 40 items is submitted for inspection in accordance with variables sampling. Table III requires a sample size of nv = 4 for code letter A. Suppose the measurements obtained are as follows: 197, 188, 184, and 205; and compliance

Line	Information Needed	Symbol	Formula	Result	Explanation
1	Sample size	nv		4	See Table III
2	Sum of measurements		x	774
3	Sum of squared measurements		x2	150034
4	Correction factor	CF	2 ( x) I nv	149769	(774)2 I 4
5	Corrected sum of squares	SS	x2 CF	265	150034-149769
6	Sample variance	v	SS I (nv 1)	88.333	265/3
7	Sample standard deviation	s	v	9.399	88.333
8	Sample mean	x	x I nv	193.500	774/4
9	Lower specification limit Upper specification limit	L U		Not applicable 209
10	Lower quality index Upper quality index Quality Index	QL QU Q	(x L) I s (U x) I s min(QL,QU)	Not applicable 1.649 1.649	(209-193.5)/9.399
11	Sample F value	F	s I (U L)	Not applicable
12	Number of nonconformances k value F value	C k F		0 1.210 Not applicable	See Table III See Table III
13	C acceptability criterion k acceptability criterion F acceptability criterion		C = 0 ? Q k ? F F ?	Yes Yes Not applicable	1.649 1.21
NOTES: The k value is the minimum allowable value for the quality index, Q. The F value is the maximum allowable value for the sample F value, F .

FIGURE 2. Computations for single specification limit case.