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|  MIL-F-27656C(USAF)
m. The vacuum shall be shut off and the filter paper removed. It shall be dried to a con-
stant weight at 125F and weighed to an accuracy of a tenth of a milligram. The difference between
the filter paper weights before and after the above procedure shall be the weight of contaminant
passing through the test filter B in the formula below. The above test, with the element removed,
shall be repeated four times for tour separate contaminant add values (A in formula below). Oil
cleaned to a level that conforms to paragraph 4.6.6.2 .1 shall be used for each test. The contaminant
collected shall be the acid value and shall be used in the calculation of the degree of efficiency, It shall
be the average of the tour runs. A system blank value shall be obtained by repeating steps a through
m above with the falter element installed and no contaiminant added This blank value shall be the
value C in the following efficiency formula and shall be less than 0.0007 gram:
No one of the four add values shall be less than 95 percent by weight of the contaminant introduced.
n. The falter unit shall remove 99.3 percent by weight of the contaminant add value This
is equivalent to 100-percent removal of particles over 5 microns and 96.6 percent removal of particles
5 microns and smaller in size, by weight.
4.6.6.5 Largest particle passed test. A filtration test shall be conducted as follows
a.
A degree of filtration test shall be conducted m accordance with the procedure specified
in paragraph 4.6.6.2.2 a through e with 2,000 ml of hydraulic fluid. The combined added contaminant
shall be 1.5 grams of APM F-9 beads and 1.5 grams of carbonyl iron E.
b. The effluent shall be passed through art absolute 1.0- micron membrane disk Type AA
Millipore filter paper, or equal.
c.
The entire disk shall be scanned. The largest bead shall be no greater than 5 microns
4.6.6.4 Pressure buildup and collapse test. A pressure buildup and collapse test shall be conducted as
follows.
The test fluid used in the system shown on figure 9 shall be precleaned by flowing through a
a
cleanup filter using the test procedure specified m paragraph 4.6.6.2.1. The cleanup filter shall be
bypassed throughout the remainder of this test
The element under test shall be installed in the housing.
b.
c.
The pump shall be started, valves A and B opened, and rated flow attained by adjusting the
variable speed drive.
Standardized fine air cleaner (AC) test dust or carbonyl iron E shall be added m increments
d.
of 4 grams at 4-minute intervals through the dust valve, in slurry. Test dust shall have the following
composition:
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