MIL-DTL-85061C
3.6 Performance. The coupling when installed on tubing in any position (attitude) shall
meet all the performance requirements when tested as specified in section 4 of this specification.
3.6.1 Visual examination. Each coupling shall be examined and inspected as specified in
4.5.1.1 and shall have no defects. All dimensions and weights shall conform to the requirements
of this specification.
3.6.2 Proof pressure. The coupling assembly shall be designed to withstand a proof
pressure of 250 ± 5 psi. A decrease in pressure when pressurized to proof pressure as specified
in 4.5.2 or any leakage (see 6.4.4) shall be cause for rejection of the coupling.
3.6.3 Leakage.
3.6.3.1 Vacuum leakage. The coupling assembly shall be subjected to the negative proof
pressure specified in 4.5.3.1. A decrease in pressure exceeding 0.5 Hg shall be cause for
rejection of the test sample.
3.6.3.2 Pneumatic leakage. The coupling assembly shall be tested with pneumatic
pressure equal to proof pressure as specified in 4.5.3.2 for 3 minutes at room temperature. The
test sample shall be rejected if there is any evidence of leakage during the test.
3.6.4 Fuel resistance. The coupling assembly shall not leak (sufficient to form a drop)
nor show evidence of damage when subjected to high temperature fuel aging at 200 °F, low
temperature fuel aging at -65 °F and air dry out at 200 °F when tested as specified in 4.5.4.
3.6.5 Vibration. The coupling assembly shall show no evidence of malfunction or
structural failure (see 6.4.3) and shall pass the proof pressure test after exposure to vibration
levels as specified in 4.5.5.
3.6.6 Repeated assembly. There shall be no evidence of deformation, damage or
degradation in the connecting ability of the coupling after 25 repeated assembly and disassembly
operations specified in 4.5.6. After repeated assembly and disassembly, the test coupling shall
pass the proof pressure test without fuel leakage (see 6.4.3).
3.6.7 Salt fog. The coupling assembly shall pass the salt fog test specified in 4.5.7
without any evidence of excessive corrosion, peeling, blistering of the finish or exposure of base
metal. Threads, connecting surfaces, and sealing surfaces shall be free of corrosion.
3.6.8 Flexure. The coupling assembly, when tested as specified in 4.5.8 with a 3 degree
tubing misalignment and flexure at ±0.5 degree for 28,800 cycles followed by the proof pressure
test shall show no evidence of leakage, rupture, permanent set, permanent deformation or
damage.
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