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|  4.4.2 Sampling.
4.4.2.1 For examination. Sampling for examination shall be conducted in accordance
with the classification of characteristics in 4.4.5 and table I.
4.4.2.2 For test. Each filter unit shell be tested in accordance with 4.4.6. in addition, a
production sample of four filter units shall be randomly selected from the first month's
production. This sample shall be tested separately from any other units in the lot.
4.4.3 inspection procedure.
4.4.3.1 For examination. Sample filter units shall be examined in accordance with the
classification of characteristics in 4.4.5 and table I.
4.4.3.2 For test. Each unit shall be tested for cycling burn-in and operational character-
istics using the procedures set forth in 4.4.6. Any unit which fails to meet the requirements
for the cycling burn-in (3. 3.1 ) or any of the operational characteristics (3.3.2) shall be
rejected. The production sample of four filter units shall be tested in accordance with 4.4.6
for conformance to 3.3.2. Then the filter units shall be tested continuously in the configura-
tion specified in 4.4.6.1 and 4.4.6.2 for conformance to 3-5. The sample shall meet the
requirements of 3.5 and the criteria of test plan IV-D of MIL-HDBK-781 to be acceptable.
4.4.4 Inspection characteristics. Critical characteristics are characteristics whose non-
conformance to specified requirements is likely to result in hazardous or unsafe conditions
for individuals using, maintaining, or depending upon the product or whose nonconfor-
mance to specified requirements is likely to prevent performance of the tactical function of
a major end item. Major characteristics are characteristics whose nonconformance to speci-
fied 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 nonconfor-
mance to specified requirements is not likely to reduce materially the operation or usability
of the item for its intended purpose.
4.4.5 Classification of characteristics. Quality conformance examinations and tests
shall be as specified in the following classification of characteristics paragraphs. When
specified herein, accept on O and reject on 1 attributes sampling inspection shall be per-
formed on the designated characteristics using the stated levels in table I for selection of
sample sizes.
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