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|  MIL-F-27656C(USAF)
b
60,000 cycles at 100 psi pressure drop
c. 100 cycles at 3,000 psi pressure drop.
46.8.2.1 Particle size. Near the completion of each subseries test a 2,000-ml sample of effluent fluid shall
be collected. The fluid sample shall be passed through an absolute 1.0-micron membrane disk type AA
Millipore filter paper. or equal. The disk shall be scanned. Any particle larger than the original micron
rating of the element under test shall be cause for rejection.
4.6.8.2.2 Final bubble point. At the completion of each subseries test, elements shall be subjected to the
test specified m paragraph 4.6.6.1. A decrease in bubble pressure from the initial value. as recorded during
the test specified m paragraph 4.6.8.1. shall be cause for rejection.
4.6.9 Burst pressure test. The burst pressure test shall be conducted at 160 F after a five hour soak at
160 F with the falter unit filled with test fluid. Pressure shall be applied with a hand pump and a maxi-
mum rate of increase of 25,000 psi per minute until the burst pressure, as specified in paragraph 3.4a. is
reached. Filter units shall show no leakage m the forms of drops or rupture of internal or external parts
at this pressure when held for 2 minutes. Following this test, the pressure may be increased above that
specified in order to secure data on actual burst pressure.
4.6.10 Fluid composition test. The cleanup filter shall be removed from the setup shown on figure 9. The
reservoir and circuit shall be filled with unfiltered hydraulic fluid. Two 1-quart samples of the unfiltered
fluid shall be collected. The fluid shall then be circulated through the circuit at 30 gpm and two 1 quart
samples of the effluent taken. Test dust shall be added at the dust valve until the differential pressure
across the filter unit reaches 100 psi. Two 1-quart samples of the effluent shall then be collected. One of
each of the three samples of fluid shall be properly identified and shall be submitted to all the tests of
MIL-H-5606. The three remaining samples shall be properly identified and forwarded to the procuring
activity. Any change to the composition of the hydraulic fluid as a result of passing through the filter
shall be cause for rejection.
4.7 Inspection of the preservation, packaging, and marking for shipment and storage. The inspection
of the preservation, packaging, packing, and marking for shipment and storage shall be in accordance
with the requirements of section 5, or the documents specified therein.
5.
PREPARATION FOR DELIVERY
5.1 Packaging (see paragraph 6.2)
5.1.1 Level A. One each falter unit or element shall be packaged in accordance with method II of MIL-
P-116. All openings of the filter unit or element shall be plugged or sealed with approved noncorrosive
materials to prevent the entry of moisture, dirt, and foreign matter. The falter unit or element shall be
wrapped m grade A barrier material conforming to MIL-B-121 and placed in a container conforming to
PPP-B-636.
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