MIL --- PRF --- 51191G(EA)
4.3.3 Inspection procedure. Sample items shall be examined and tested in accordance
with the classification of characteristics in 4.3.5. Failure of any sample item to conform to any
characteristic in the classification of characteristics based on the sampling and acceptance cri-
teria specified therein shall be cause for rejection of the lot represented.
TABLE II.
Inspection levels and sample sizes
Lot size
I
III
IV
V
VI
VII
II
VIII
IX
X
XI
*
*
*
3
2 to 8
*
*
*
*
*
5
2
*
13
8
5
*
*
2
*
3
9 to 15
*
*
*
13
8
5
*
20
3
3
16 to 25
*
*
*
32
13
8
5
*
20
5
*
5
26 to 50
*
*
32
13
8
7
*
20
5
6
51 to 90
50
*
*
*
32
13
12
11
20
6
125
7
91 to 150
50
*
32
20
19
13
*
20
7
10
151 to 280
50
125
*
48
29
21
16
315
47
9
125
11
281 to 500
50
*
11
125
73
34
27
19
315
47
15
501 to 1200
75
*
125
73
42
35
23
315
53
13
18
116
1250
1201 to 3200
15
192
86
50
38
29
1250
315
68
22
116
3201 to 10000
294
108
60
46
35
1250
315
77
15
29
135
10001 to 35000
294
15
123
74
56
40
1250
490
96
29
170
35001 to 150000
345
156
90
64
40
1250
715
119
15
29
200
150001 to 500000
435
15
189
102
64
40
1250
715
143
29
244
500001 and over
*Indicates one hundred percent inspection. If sample size exceeds lot size, perform
one hundred percent inspection.
Accept the lot represented on zero nonconforming characteristics and reject the lot
represented on one or more nonconforming characteristics for all inspection levels.
4.3.4 Inspection characteristics. Critical characteristics are characteristics whose non-
conformance to specified requirements is likely to result in hazardous or unsafe conditions for
individuals who use or maintain the product. Characteristics whose nonconformance to spe-
cified requirements is likely to prevent performance of the tactical function of a major end
item are also critical characteristics. Major characteristics are characteristics whose noncon-
formance to specified requirements is likely to result in failure or to reduce materially the
usability of the item for its intended purpose. Minor characteristics are characteristics whose
nonconformance to specified requirements is not likely to reduce materially the operation or
usability of the item for its intended purpose.
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