MIL-DTL-83797C
4.7.9 Oil immersion (see 3.5.9). Hose assemblies, when subjected to oil immersion, shall meet the
requirements of 3.5.9. The following details shall apply:
a. The uncapped hose assemblies shall be immersed in oil in accordance with MIL-PRF-7808 at
a temperature of 250°F± 2°F (121°C ± 1.1°C) for a period of 168 hours.
b. After 24 hours, 96 hours, and 168 hours, the assemblies shall be removed, cooled to room
temperature, and shall pass the proof pressure test, using oil in accordance with
MIL-PRF-7808.
c. The assemblies shall then pass the inner tube bulge, straight coupling test.
d. The hose shall then be dissected longitudinally and visually inspected.
"CAUTION: Use safety precautions. Fuel and oil under pressure and at high temperature may self
ignite or explode."
4.7.10 Cold temperature deflection test (see 3.5.10). Hose assemblies, when subjected to cold
temperature deflection test, shall meet the requirements of 3.5.10. The following details shall apply:
a. One of two hose assembly samples shall be oil-aged in accordance with 4.6.3, and the other
hose assembly not conditioned.
b. The hose assemblies shall then be installed in the apparatus shown on figure 3 and subjected
to the cold temperature deflection test.
c. The oil-aged assembly shall be filled with MIL-PRF-7808 oil, and the non-aged assembly with
type JP-8, MIL-DTL-83133 fuel (JP-5 may be used as an alternate).
d. These assemblies shall be placed in a cold chamber, the temperature of which shall be
controlled at -65 ± 2 °F(-54°C ± 1.1°C), and maintained at this temperature for 2 hours.
e. After this time, and while at the specified temperature, the assemblies shall be subjected to
f. The hose assemblies shall also be subjected to a deflection of plus or minus .5 inch (12.7 mm)
at a rate of 15 cycles a minute for a 15 minute period.
g. Then the hose assemblies shall be allowed to return to room temperature, and shall be
subjected to the proof pressure test.
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