MIL-DTL-85061C
4.5.4.1 High temperature fuel aging. MIL-PRF-7024 test fluid shall be circulated in a
coupling test assembly for 72 hours at 200°F and 250 PSIG. During the final 8 hours of this test,
the assembly shall be vibrated in accordance with 4.5.5. Upon completion and while still
mounted, the coupling test assembly shall be proof tested at 250 PSIG and +200°F and held at
that pressure and temperature for not less than 1 minute. There shall be no evidence of leakage
or deformation of the coupling. Any leakage or damage to the coupling shall be cause for
rejection.
4.5.4.2 Low temperature fuel aging. MIL-PRF-7024 test fluid shall be circulated in a
coupling test assembly for 72 hours with the fluid at 250 PSIG and -65°F. During the final 8
hours of this test, the coupling assembly shall be vibrated in accordance with 4.5.5. Upon
completion of the vibration test, and while still mounted in accordance with 4.5.5, the assembly
shall be proof tested at 250 PSIG and at -65°F with the pressure and temperature held for not less
than 1 minute. There shall be no evidence of leakage or deformation of the coupling. Any
leakage or damage to the coupling shall be cause for rejection.
4.5.4.3 Air dry out. Upon completion of the low temperature fuel aging test, the
coupling test assembly shall be drained and all caps removed. The coupling test assembly with
both ends open shall be placed in an air oven for 168 hours at +200°F. The low temperature fuel
aging test of 4.5.4.2 shall be repeated upon completion of the air dry out test.
4.5.5 Vibration test.
4.5.5.1 Vibration test setup. The coupling assembly shall be mounted on a vibration test
fixture as shown on figure 2 with an angular displacement of 3 degrees between tube centerline.
The distance between test assembly table supports, with the coupling located in the center of the
assembly, shall be 20 inches for all sizes. The X and Y axes of the test assembly shall be parallel
to the vibration table and the direction of vibration Z shall be perpendicular to the vibration
table.
4.5.5.2 Vibration test. Unless otherwise specified in the contract, the vibration test shall
be conducted in accordance with MIL-STD-810 method 514.6 and the applicable test procedures
and categories specified in table VII herein.
4.5.6 Repeated assembly. The coupling assembly shall be tested with repeated assembly
and disassembly for 25 operations. There shall be no evidence of damage or degradation in the
connecting ability of the coupling. After the repeated assembly test, the coupling assembly shall
be subjected to the proof pressure test as specified in 4.5.2. Any leakage or malfunction shall be
cause for rejection of the coupling assembly.
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