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| MIL-P-18761C(OS)
test and examination in accordance with the first article inspection plan of table I (see 6.2 and 6.4). Prior to
delivery, a first article shall be inspected and tested by the contractor for all requirements specified herein.
4.4.1 First article sample rejection. Failure of the first article sample to meet any of the requirements shall
be cause for rejection of the sample.
4.5 Quality conformance inspection.
4.5.1 Lot formation. Unless otherwise specified in the contract (see 6.2), inspection lots shall consist of
not more than 20,000 homogeneous primers plus those required for inspection (see 4.5.2). Each inspection
lot shall contain only one Class 2 black powder lot. Failure of the quality conformance sample to meet any
of the requirements specified herein shall be cause for rejection of the sample.
4.5.2 Sampling for inspection. Unless otherwise specified in the contract or order (see 6.2), 200 samples
shall be selected at random from each production lot for test and examination in accordance with the quality
conformance inspection plan of table I. This sample is in addition to those primers required for contractor
inspection and tests.
4.6 Classification of characteristics. The characteristics verified by the tests and examination herein are
classified as critical, major, or minor in accordance with DOD-STD-2101. Requirements for critical
characteristics are identified by the symbol (C) and major characteristics by the symbol (M). The number
following the classification symbol indicates the serial number of the characteristic. Requirements not
annotated with a classification code are classified as minor.
4.7 Methods of inspection.
4.7.1 Radiographic. The primer shall be subjected to a radiographic inspection in accordance with MIL-
STD-453. The primer shall be mounted in the vertical position with the primer stock up and X-rayed
perpendicular to its axis, focused at a point 0.25 0.20 inch from the stock face. Any primer which meets the
requirements of 3.3 but appears to have been misassembled shall be subjected to detail strip and shall meet
the requirements of 3.5.
4.7.2 Determination of moisture content. Moisture analysis procedure for the black powder shall be as
follows:
a.
Ten grams (10.0 g) of black powder from each sample primer shall be tested in the granular form
for moisture content.
b.
The black powder shall be removed from primer tubes and placed in a dry container with a tight
cover. Black powder shall not be exposed to the atmosphere for more than 3 minutes.
c.
Sample containers must be covered and placed in a desiccator until ready to test the moisture
content.
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