MIL-PRF-46720C
3.6.7 Vibration. The valve shall withstand vibration, without loosening of components.
Vibration shall be applied in the direction of each of the three major axes, without damage or
loosening of components. Subsequent performance shall conform to 3.3.2, 3.3.3, 3.3.5, and
3.5.1.
3.6.8 Humidity. The valve shall withstand exposure to humidity in and with subsequent
performance conformance in 3.3.5 and 3.3.4.
4. VERIFICATION
4.1 Classification of inspection:
a. First article inspection.
1. Preproduction inspection.
2. Initial production inspection.
b. Conformance inspections.
4.1.1 First article inspection. When first article inspection is required (see 6.2 and 6.5), it
shall be performed on preproduction or initial production samples as specified herein.
4.1.1.1 Preproduction inspection. When specified (see 6.2), the preproduction sample
shall consist of four valves. The preproduction inspection shall consist of the examinations and
tests of table I.
4.1.1.2 Initial production inspection. When specified (see 6.2), the initial production
inspection shall consist of selecting four valves, from the first ten valves produced. The valves
shall be subjected to the examinations and tests of table I.
4.1.2 Conformance inspection. Conformance inspection shall include those examinations
and tests from table I as defined in the contract.
4.2 Order of inspection. The inspection sequence shall be in the order specified in table I.
4.3 Verification methods. The types of verification methods included in this section are
visual inspection, measurement, sample tests, full-scale demonstration tests, simulation, modeling,
engineering evaluation, component properties analysis, and similarity to previously approved or
previously qualified designs.
4.3.1 Verification alternatives. The manufacturer may propose alternative test methods,
techniques, or equipments including the application of statistical process control, tool control, or
cost-effective sampling procedures, to verify performance. See the contract for alternatives that
replace verifications required by this specification.
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