MIL-DTL-24402F(SH)
4.2.2.1.3 Assemblies with different indicators. Qualification approval for an assembly with a different form of
differential pressure indicator may be extended from the original assembly qualification provided the additional
form of differential pressure indicator has passed qualification tests.
4.2.2.1.4 Assembly consisting of qualified components. Qualification approval without additional testing will
be considered for an assembly that is formed by combining previously qualified components.
4.2.2.2 Differential pressure indicators. Fatigue impulse tests may be extended from qualified assemblies for
which the only differences are the actuation pressure and operating pressure range.
4.3 Conformance inspection. Conformance inspection shall consist of the examinations and tests specified in
table II. Conformance inspection shall be conducted on each filter housing and differential pressure indicator in the
sequence shown in table II. Any filter housing or differential pressure indicator containing a defect shall be rejected.
TABLE II. Conformance inspection.
Individual inspection
Examination and tests
Requirement
Test method
Filter housings
Examination
Proof pressure 1/, 2/
Relief valve operation 1/
Selector valve operation
and leakage
Check valve leakage 1/
Differential pressure indicators
Examination
Proof pressure 1/, 2/
Operation
NOTES:
1/
Fluid temperature and viscosity specified in 4.4 do not apply. When test fluid other
than MIL-PRF-17331 is used for leakage tests, increased leakage rates are only
permitted when specifically approved by the qualifying activity.
2/
Proof pressure test shall be conducted prior to all other tests.
4.4 Test conditions. Unless otherwise specified (see 6.2 and tables I and II), the hydraulic fluid used for all
tests shall conform to MIL-PRF-17331. Where MIL-PRF-17331 fluid is used for testing, the fluid temperature shall
be that temperature at which the actual fluid viscosity is 100 centistokes, and the temperature shall be maintained to
±1.8 °F (1 °C).
4.5 Examination. The filter housings and differential pressure indicators shall be examined to determine
compliance with the requirements specified herein with respect to design, visible defects, dimensions, marking, and
workmanship.
4.6 Test methods.
4.6.1 Filter housings and differential pressure indicators. Unless otherwise specified herein, all tests shall be
conducted with filter elements installed.
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