MIL-DTL-62265C(AT)
4.9.9.4 Endurance test. This test shall be conducted in conjunction with 4.9.9.1. The
relief valve shall be cycled 2000 times from zero flow to the flow specified in table VI, and back
to zero flow. At the conclusion of 2000 cycles, the cracking and reseating pressure of 4.9.9.1
and 4.9.9.3 shall be verified.
4.10 Interface requirements verification.
4.10.1 Dimensional constraints. To determine the dimensional constraints, measuring
equipment shall be used (see 4.7). Dimensions not within tolerance shall cause for rejection.
4.10.2 Weight. To determine the weight of the filter element and relief valves, a scale
shall be used (see 4.7). Weight exceeding the values specified in 3.5.2 shall cause for rejection.
4.11 Support and ownership requirement verification.
4.11.1 Identification marking. To determine the legibility and permanence of the
marking, a visual examination shall be used (see 4.5 and 4.7). Incorrect or illegible marking shall
cause for rejection.
4.11.2 Workmanship. To determine workmanship of the assembly, a visual and
mechanical examination shall be used to find detrimental defects of the filter element and relief
valve (see 4.5 and 4.7).
4.12 Environmental requirements verification. Assemblies undergoing preproduction,
initial production, or control testing shall be subjected to hydraulic fluid bubble point tests
(see 4.9.1.2) before and after each of the environmental tests performed. Assemblies undergoing
environmental control test shall have passed the acceptance tests (see 3.7).
4.12.1 Temperature (see 3.7.1).
4.12.1.1 Low temperature. The assembly shall be subjected to low temperature testing at
-65 °F for 12 hours in accordance with procedure I, method 502 of MIL-STD-810, or equivalent
(see 4.7). While stabilized at -65 °F, the assembly shall be subjected to a total of 10 flow cycles
at a differential pressure across the assembly from zero to 90 psi, and back to zero by first
increasing, then decreasing, the flow through the assembly. Each flow cycle shall be
15 ± 5 seconds in duration. The test fluid and assembly shall be maintained at -65 °F or less for
the duration of the test. The flow shall not exceed 150 percent of the rated flow and shall be at a
minimum of 0.5 gal/min. Subsequent to low pressure exposure, perform the hydraulic fluid
bubble point test of 4.9.1.2. The bubble point value obtained shall not be less than the minimum
value established during preproduction or initial production testing of 4.9.1.2.
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