MIL-DTL-62006C(AT)
4.3.1 Verification alternatives. The manufacturer may propose alternative test methods,
techniques, or equipment, including the application of statistical process control, tool control, or
cost effective sampling procedures, to verify performance. See the contract for alternatives that
replace verification required by this specification.
4.3.2 Inspection conditions. Unless otherwise specified (see 6.2), ambient air temperature
shall be 75 ± 10 degrees Fahrenheit (°F) (24 ± 5.5 degrees Celsius (°C)), barometric pressure shall
be 28.54 (+2, -3) inches (in.) mercury (96.1 + 6.7/-10.1 kilopascals (kPa)), and relative humidity
shall be 50 ± 30 %.
4.3.3 Design, construction, and materials verification. Use any of the methods outlined in
4.3 to assure that cooler assemblies and/or cores conform to the applicable drawings as specified
in table I.
4.3.3.1 Welding, brazing, and soldering verification. Circulate water at 180 to 200°F
(82 to 93°C) through the core for 10 minutes. Following the water circulation, the chloride
content shall not exceed 40 parts per million above existing level for local water.
4.3.3.2 Corrosion resistance verification. Cooler assemblies and/or cores shall be tested
in accordance with GM9540P, method A, duration D, and show no evidence of corrosion. All
operating requirements verifications (see 4.4) shall be passed after exposure to this test.
4.4 Operating requirements verifications. Complete each verification under 4.4.
4.4.1 Leakage tests. Perform the tests as specified in 4.4.1.1 and 4.4.1.2.
4.4.1.1 Pneumatic pressure test. Cooler assemblies and/or cores shall be submerged in
water at a temperature of 120 to 140°F (49 to 60°C). While submerged, the internal pressure
shall be gradually applied, using dry air or nitrogen, until a pressure of 400 psi (2758 kPa) is
achieved and maintained for a period of no less than 10 minutes. There shall be no evidence of
leakage or permanent distortion of the cooler.
4.4.1.2 Hydraulic pressure test. Cores shall be subjected to 15 000 hydraulic pressure
cycles from 0 to 300 psi (2068 kPa), at a rate of 13 to 20 cycles per min, at an oil temperature of
170 to 200°F (77 to 93°C), and on a test stand capable of maintaining the specified pressure,
cycle rate, and temperature. Oil used for the test shall be 40 grade oil, conforming to
MIL-PRF-2104, or equivalent. There shall be no evidence of leakage.
4.4.2 Heat rejection tests. Heat rejection tests shall be conducted using oil of the grade
indicated entering the cooler assemblies and/or cores at the oil flow rates, air inlet and outlet
temperatures, and air flow rates listed in table IV. Verify that heat rejection is within specified
limits.
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