MIL-PRF-14442E(AT)
of fluid conforming to reference fuel B of ASTM D471. The samples shall be allowed to stand
for 48 hours at 77 + 5°F. The contaminated test fluid shall be decanted off, and the nonvolatile
gum residue shall be determined by the method specified in ASTM D381. The total evaporation
time shall be 45 minutes.
4.6.3.2 Stoved gum residue. Stoved gum residue content shall be determined after
necessary corrections have been made for performed gums, originally present in the test fluid.
The beakers containing the nonvolatile material shall be placed in an appropriate bath maintained
at a constant temperature of 572 + 9°F for 30 minutes, and then weighed after being cooled in a
closed container.
4.7 Environmental.
4.7.1 Humidity (hydrolytic stability) at elevated temperature. To determine conformance
to 3.4.1, one 6 by 6 in. specimen of the composite tank construction shall be examined after being
exposed to a temperature of 158 + 2°F and 100% relative humidity for a period of 15 days.
4.7.2 Humidity (hydrolytic stability) at room temperature. To determine conformance to
3.4.2, two specimens 1 by 6 by 0.075 + 0.025 in. shall be examined under 7-power magnification
after being exposed to room temperature and 100% relative humidity for 30 days. When
practical, these specimens shall be mounted on an appropriate fixture in a manner to cause a
stretch of 20%, measured between gage marks 4 in. apart, centered in the middle section of each
strip.
4.7.3 Low temperature leakage. To determine conformance to 3.4.3, the fuel tank shall
be emptied, after the test specified in 4.9.2, and the interior of the cavity in which the tank is
installed shall be completely lined with brown paper. The tank shall be refilled with a test fluid
conforming to reference fuel B of ASTM D471 containing a staining agent, and allowed to stand
for a period of 7 days at 110 + 10°F. The tank shall then be emptied and subjected to an air
dry-out at 160 + 10°F for 7 days. Following the air dry-out, the tank shall be refilled with the
same test fluid specified and cooled to a temperature of -67 + 3.6°F and allowed to remain at this
temperature for a minimum period of 3 days. The tank shall then be brought back to room
temperature and allowed to stand until completely drained and then examined for leakage as
indicated by staining the brown paper.
4.8 Support and ownership. Conformance to 3.5 through 3.5.10.3 shall be determined
using appropriate verification methods specified in 4.5 or 4.5.1 and the tests specified in 4.8.l
through 4.8.6.
4.8.1 Handling. To determine conformance to 3.5.4, the fuel tank shall be folded and
unfolded as specified and then installed and removed from the test structure five times.
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