MIL-DTL-62265C(AT)
4.7 Verification methods. Acceptable verification methods included in this section are
visual inspection and measurement, sample tests, full-scale demonstration tests, simulation,
modeling, engineering evaluation, component properties analysis, and similarity to
previously-approved or previously-qualified designs.
4.7.1 Verification alternatives. The manufacturer may propose alternative test methods,
techniques, or equipment, including the application of statistical process control, tool control, or
cost effective sampling procedures to verify performance. See the contract for alternatives that
replace verification methods required by this specification.
4.8 Material. Conformance to 3.2 thru 3.2.4, shall be determined by inspection of
contractor records providing proof or certification that materials conform to requirements.
Applicable records shall include drawings, specifications, design data, receiving inspection
records, processing and quality control standards, vendor catalogs and certifications, industry
standards, test reports, and rating data.
4.9 Operating requirements verification.
4.9.1 Bubble point (see 3.4.l).
4.9.1.1 Alcohol, first article testing. To determine the bubble point for the assembly the
following method shall be used:
a. Install the assembly in a test fixture which will permit simultaneous pressurization
and 360° rotation of the assembly around its longitudinal axis.
b. Cover the assembly to a depth of 0.5 in. with isopropyl alcohol, or equivalent, at
70° ± 5°F. The bubble point test shall be performed within 10 minutes after
immersion of the assembly.
c. Connect an air pressure source to the assembly and raise the pressure in small
increments.
d. Rotate the assembly slowly during each pressure increment so that the entire filter
surface area can be observed for the appearance of the first bubble.
e. The manometer reading (in in. of water) at the time the first bubble is emitted
from the assembly is the alcohol bubble point of the element.
f. Inspect the results.
4.9.1.2 Hydraulic fluid, first article testing, and control level establishment.
a. Install the assembly in a test fixture which will permit simultaneous pressurization
and 360° rotation of the assembly around its longitudinal axis.
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