MIL --- PRF --- 51526B
4.3 Conformance inspection.
4.3.1 Lotting. A lot shall consist of particulate filters produced by one manufacturer at
one plant, from the same materials, by the same process, and without a break in production
of more than 10 calendar days. Each lot shall be identified and controlled in accordance with
MIL --- STD --- 1168.
4.3.2 Sampling. Inspection and test of random samples shall be conducted in accordance
with the classification of characteristics in 4.3.5, and when specified in Table II.
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 char-
acteristics in 4.3.5. Failure of any sample to conform to any characteristic in the classification
of characteristics based on the sampling and acceptance criteria specified therein shall be
cause for rejection of the lot represented (see footnote, Table II). Any filter samples for-
warded to the Government for testing shall be packaged such they will be protected from
moisture in the air. One or more environmental tests shall also be conducted if there is a ma-
terials change that increases the risk of failure for a particular environment.
4.3.4 Inspection characteristics. Critical characteristics are those whose nonconformance
to specified requirements is likely to result in hazardous or unsafe conditions for individuals
using, maintaining, or depending upon the product. Also those characteristics whose non-
conformance to specified requirements is likely to prevent performance of the tactical func-
tion of a major end item. Major characteristics are those whose nonconformance 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 those whose nonconformance to specified re-
quirements is not likely to reduce materially the operation or usability of the item for its in-
tended purpose.
4.3.5 Classification of characteristics. Conformance examinations and tests shall be as
specified in Table III. When specified herein, accept on "0" and reject on "1" attributes sam-
pling inspection shall be performed on the designated characteristics using the stated levels
in Table II for selection of sample sizes.
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