MIL-PRF-83870C
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
III), filter elements shall be immersed in 350°F test fluid for 100 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
(0.8 micron absolute)(see 6.5).
4.4.5 Flow cycle. A flow cycle consists of increasing the differential pressure across the filter element from 0 to 200
psi and then decreasing to 0 psi.
4.4.6 Fatigue cycle. A fatigue cycle consists of increasing the differential pressure across the filter element (loaded
with AC dust) from 0 to the element pressure drop in the flow fatigue part of table II and decreasing to 0 psi.
4.5 Requirements cross-reference matrix. Table IV provides a cross-reference matrix of the section 3 requirements
tested or verified in the paragraphs below.
TABLE IV. Requirements cross-reference matrix
Requirement
Verification
Requirement
Verification
3.1
4.2
3.5.3
4.6.2
3.3
4.6.1, 4.6.7
3.5.4
4.6.8
3.3.1
4.6
3.5.5
4.6.3
3.4.1
4.6.1
3.6
4.6.1
3.4.2
4.6.1
3.7
4.6.1
3.5.1
4.6
3.8.1
4.6.9.1
3.5.2
4.6.8
3.8.2
4.6.9.2
4.6 Tests.
4.6.1 Examination. The filter element shall be examined for compliance with requirements for materials, dimensions,
and markings.
4.6.2 Bubble point.
4.6.2.1 Initial bubble point. The initial bubble point of each filter element undergoing qualification testing shall be
determined in accordance with the procedures in SAE ARP 901. The lowest initial bubble point of the four qualification
test filter elements is the value to be used in all subsequent tests referring to initial bubble point.
4.6.2.2 Conformance bubble point. Each filter element shall be subjected to the bubble point test in SAE ARP 901 and
shall have a bubble point equal to or higher than the lowest initial bubble point established in 4.6.2.1.
4.6.3 Cold start. The filter element shall be installed in a non-bypassed test filter housing filled with test fluid, placed in a
test system, and subjected to a temperature of -65°± 5°F for four hours (a typical test system is shown in figure 10). At or
below this test fluid temperature, 10 flow cycles shall be conducted with each cycle 15± 5 seconds in duration. The flow
rate during this test shall not exceed 150% of rated flow (see table II) or be less than 0.5 gal/min. There shall be no filter
media damage as evidenced by satisfactory completion of the initial bubble point (4.6.2.1), maximum particle passed
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