MIL---DTL---52011(EA)
shall obtain written approval from the contracting activity prior to proceeding with regular pro-
duction.
4.3 Conformance inspection.
4.3.1 Lotting. A lot shall consist of the filters produced by one manufacturer, at one plant,
from the same materials, under essentially the same manufacturing conditions, and offered for
acceptance at one time; however, no more than one lot of filter material shall be represented in
any one lot of finished filters. Each lot shall be identified by an alphanumeric lot number. The lot
number shall include a manufacturer's identification symbol consisting of 3 alpha characters, a
numeric code identifying the year of production, a code or abbreviation that signifies the month
of production, and an interfix --- serial number. The interfix --- serial number shall change if there
is a change in the design, manufacturing process, materials, suppliers, production run, or if a new
contract is used.
4.3.2 Sampling. Sampling shall be conducted in accordance with the classification of charac-
teristics in 4.3.5 and, when specified, table I or table II. Samples shall be selected at random.
TABLE I. Sampling for rough handling
Lot size
Sample size
2 to 15
2
16 to 25
3
26 to 90
5
91 to 150
8
151 to 500
13
501 to 1,200
20
1,201 to 10,000
32
10,001 to 35,000
50
35,001 to 500,000
80
125
Over 500,000
Accept the lot represented on zero nonconforming characteristics
and reject the lot on one or more nonconforming characteristics
for all sample sizes.
4.3.3 Inspection procedure. Every item in the lot shall be inspected for critical characteris-
tics. Sample filters shall be examined and tested in accordance with the classification of charac-
teristics in 4.3.5. If a filter is found that does not conform to any characteristic inspected 100%,
such as filtration efficiency and airflow resistance, the non --- conforming filter shall be rejected
4
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