![img](MIL-PRF-8386100008im.jpg)
MIL-PRF-83861D
4.4.6 Flow cycle. A flow cycle consists of increasing the differential pressure across the
filter element from 0 to the operating pressure in table I and then decreasing to 0 psi.
4.4.7 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 I and decreasing to 0 psi.
4.5 Requirements cross-reference matrix. Table III provides a cross-reference matrix of
the section 3 requirements tested or verified in the paragraphs below.
TABLE III. Requirements cross-reference matrix
Requirement
Verification
Requirement
Verification
3.1
4.2
3.6.2
4.6
3.3
4.6.1
3.6.3
4.6.8.3
3.4.1
4.6.9
3.6.4
4.6.2
3.4.2
4.6.1
3.6.5
4.6.4
3.5.1
4.6.1
3.6.6
4.6.3
3.5.2
4.6.1
3.7
4.6.1
3.6.1
4.6.10
3.8
4.6.1
4.6 Tests.
4.6.1 Examination. The filter element shall be examined for compliance with
requirements for materials, dimensions, markings, and workmanship.
4.6.2 Bubble point.
4.6.2.1 Initial bubble point. The initial bubble point of each filter element shall be
determined in accordance with the procedures in SAE-ARP901. The lowest initial bubble point
of the four filter elements is the value to be used in all subsequent tests referring to initial bubble
point. Filter elements having an initial bubble point of less than 3 inches of water are not
acceptable.
4.6.2.2 Conformance bubble point. Each filter element shall be submerged in test fluid
(see 4.4.1) and an air pressure set to 0.1 inch of water less than the initial bubble point shall be
applied to the filter element. No bubbles shall emerge from the filter element.
4.6.3 Cold start. The filter element shall be installed in a test filter housing filled with
test fluid, placed in a test system (see figure 4), and subjected to a temperature of -65° ± 5°F for
four hours. At or below this test fluid temperature, 10 flow cycles shall be conducted, at the
differential pressure shown in table 1, with each cycle 15 ± 1 seconds in duration. The test filter
housing relief valve, where applicable, shall be blocked during this test. There shall be no filter
media damage as evidenced by satisfactory completion of subsequent tests in table II. The filter
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