MIL --- DTL --- 51222E(EA)
item. Major characteristics are characteristics whose nonconformance to specified require-
ments 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 require-
ments is not likely to reduce materially the operation or usability of the item for its intended
purpose.
4.3.5 Classification of characteristics. Quality conformance examinations and tests shall be
as specified in the following classification of characteristics paragraphs. When specified herein,
accept on 0 and reject on 1 attributes sampling inspection shall be performed on the designated
characteristics using the stated levels in table I for selection of sample sizes.
TABLE I. Sampling
Inspection levels and sample sizes
Lot size
II
VIII
IX
X
XI
I
III
IV
V
VI
VII
**
**
**
2 to 8
**
**
**
**
**
**
**
**
**
**
**
**
**
9 to 15
**
**
**
**
**
**
*
20
16 to 25
*
3
*
8
13
5
3
*
*
*
*
20
8
26 to 50
5
*
13
5
5
*
32
*
20
51 to 90
50
*
8
13
6
7
*
5
32
*
50
20
12
91 to 150
7
*
13
11
125
6
32
20
*
151 to 280
50
*
19
20
10
13
7
125
32
50
315
47
21
281 to 500
11
*
29
16
125
9
48
75
315
27
15
47
501 to 1200
*
73
34
19
125
11
116
35
18
315
1201 to 3200
53
73
42
1250
23
13
125
116
315
38
22
68
3201 and above
86
50
1250
29
192
15
*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.
**Uneconomical lot size. Not applicable.
8
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