MIL-PRF-14442E(AT)
4.5.1 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.
4.6 Interface and interoperability. Conformance to 3.3 through 3.3.3 shall be determined
using appropriate verification methods specified in 4.5 or 4.5.1 and the tests specified in 4.6.1
through 4.6.3.2.
4.6.1 Installation.
4.6.1.1 First article sample. For first article testing, conformance to 3.3.1 shall be
determined using the test structure specified in 4.2.1.
4.6.1.2 Quality conformance. For conformance testing, conformance to 3.3.1 shall be
determined, using a test jig (see 4.2.2) or registered metal templates fabricated in accordance with
design requirements furnished by the vehicle manufacturer for the particular vehicle.
4.6.2 Stand. To determine conformance to 3.3.2, the tank shall be tested as specified in
4.6.2.1 or 4.6.2.2, as applicable.
4.6.2.1 First article. Upon completion of the low temperature test specified in 4.7.3, the
cavity shall be completely lined with brown paper. The tank shall be refilled with fluid conforming
to reference fuel B of ASTM D471. The tank shall be allowed to stand at the standard ambient
temperature for a period of 30 days, at which time the paper shall be examined for any stains
indicating a fluid leakage.
4.6.2.2 Conformance testing. Each tank selected for conformance inspection shall be
collapsed and held for 30 minutes in a position comparable to that encountered prior to
installation in its respective vehicle cavity. Prior to the installation of the tank, the test structure
shall be completely lined with brown paper and held in place with tape conforming to
ASTM D5486. Then the tank shall be installed in its test structure. The tank shall then be filled
with fluid conforming reference fuel B of ASTM D471 and shall be stand tested for 30 days. The
tank may be inspected at 10-day intervals during the test. At the conclusion of the 30-day test,
the tank shall be drained and removed from the test cavity. The test cavity shall be inspected for
evidence of leakage as indicated by stains on the brown paper. After the examination, if stains are
present on the brown paper, evaluation shall be made in accordance with the test procedure
specified in 4.9.2.
4.6.3 Fuel contamination.
4.6.3.1 Nonvolatile gum residue. A 5 gram sample of the inner layers, up to the barrier,
shall be diced into approximately 0.06 in. squares and shall be placed in a flask containing 230 ml
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