MIL-PRF-45085D
4.5.2 Defects. Conformance to 3.3 through 3.3.4, 3.5 and 3.6 shall be determined by
examination for the defects listed in table I. Examination shall be visual, tactile, or by
measurement with Standard Inspection Equipment (SIE).
4.5.3 Inspection conditions. Unless otherwise specified (see 6.2), all inspections shall be
conducted under the following conditions:
a. Air temperature 73 + 18 degrees Fahrenheit (°F).
b. Barometric pressure 28.5 (+2, - 3) inches of mercury (Hg).
c. Relative humidity 50 + 30%.
4.5.4 Performance. Conditions for tests hereunder shall be as specified in 3.4.
4.5.4.1 Leakage tests. To determine conformance to 3.4.1, each sample item shall be
submerged in water at temperature of 135 to 150°F. While submerged, an internal pressure, using
air or nitrogen, shall be gradually applied until a pressure of 200 pounds per square inch (psi) has
been reached. This pressure shall be maintained for 1 minute to determine conformance to 3.4.1.
4.5.4.2 Cycling. To determine conformance to 3.4.1, each sample item shall be
submerged as specified in 4.5.4.1 and subjected to 10 cycles of air or nitrogen pressure with each
cycle consisting of increasing the pressure from 0 to 200 psi and holding the maximum pressure
for 15 seconds.
4.5.4.3 Hydrostatic test. To determine conformance to 3.4.2, each sample item shall be
subjected to a hydrostatic pressure of 300 psi for 5 minutes. Cores subjected to this test shall not
be acceptable as part of the quantity of the contract and are not to be shipped.
4.5.4.4 Heat rejection. To determine conformance to 3.4.3, each sample to be heat
rejection tested shall be mounted in a test setup to produce the proper flow circuit for that core
arrangement (see figure 1). Testing shall be conducted using SAE grade 10W oil.
4.5.4.4.1 Heat rejection test, core arrangement A. To determine conformance to 3.4.3.1,
the oil entering the cores of engine core assemblies shall be at 215°F and at oil flow rates of 270,
204 and 135 pounds per minute (lb/min) with the air temperature to the core at 90 + 10°F and the
air flow rates of 80 to 180 lb/min per square feet (ft2) in 20 lb/min per ft2 increments
(see figure 2). Testing shall be conducted using SAE grade 10W oil.
4.5.4.4.2 Heat rejection test, core arrangement B. To determine conformance to 3.4.3.2,
the oil entering transmission oil core assembly shall be at 300°F and at oil flow rates of 375, 300,
200, and 100 lb/min with an air temperature of 90 + 10°F to the core and air flow rates of 80 to
180 lb/min per ft2 increments (see figure 3).
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