MIL-PRF-83861D
4.3 Conformance inspection Conformance inspection shall consist of the individual tests in
4.3.1 and the sampling tests in 4.3.2.
4.3.1 Individual tests. The filter element shall be subjected to the examination in 4.6.1,
except for dimensional analysis, and the test in 4.6.2.2.
4.3.2 Sampling tests. A sample of filter elements shall be selected in accordance with
ANSI/ASQ Z1.4 at an S-1 inspection level unless modified in the procurement document (see
6.2), and shall be subjected to the examination in 4.6.1 and the tests in 4.6.2.2, 4.6.4, and 4.6.6.
One half of the sample parts shall be subjected to the test in 4.6.6 without in-line particle
sampling. The remaining half of the sample parts shall be subjected to the test in 4.6.4. If the
sample size is an odd number, the extra filter element shall be subjected to the test in 4.6.6.
4.4 Test conditions and preparation.
4.4.1 Test fluid. Unless otherwise specified, the test fluid used for all tests shall conform
to MIL-PRF-5606, MIL-PRF-83282, or MIL-PRF-87257 hydraulic fluid.
4.4.1.1 Test fluid cleanliness. The test fluid shall be pre-cleaned to a level equal to
SAE-AS4059.
4.4.1.2 Test fluid filtration. Unless otherwise specified, the test fluid shall be
continuously filtered through a 3-micron absolute filter that will remove 99.5% by weight of
contaminants.
4.4.1.3 Test fluid temperature. Unless otherwise specified, the test fluid temperature
shall be 100° ± 10°F.
4.4.2 Temperature. Unless otherwise specified, the tests shall be conducted at room
ambient temperature.
4.4.3 Immersion. After performing the initial bubble point test and prior to performing
the qualification tests (see table II), filter elements shall be immersed in 275°F test fluid for 72
hours and then in -65°F test fluid for another 72 hours. All internal parts shall be in contact with
the test fluid during this period. After immersion, the filter elements shall remain in the test fluid
at room temperature until further tests are conducted.
4.4.4 Test air. The air used to pressurize a test setup shall be filtered through a
membrane filter (0.45 micron absolute)(see 6.4).
4.4.5 Elimination of static electricity. A device to eliminate static electricity shall be in
proximity to the filter membrane, or to the pan on which it rests, whenever any object or material
is being weighed to a precision of ±0.1 gram or finer.
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