MIL-PRF-44408C
4.2.3.1.2 Squareness. The shelter shall be tested in accordance with ASTM PS
27-95. For the purpose of this test, any horizontal surface shall be considered a
roof/floor and any vertical surface shall be considered a wall. In those regions
where a 36 inch square is impractical, a square of the appropriate size shall be
used and the allowed gap shall be proportional.
4.2.3.2 Shelter dimensions. Each non-reference dimension specified on
interface drawing 17-2-0035 shall be measured. Failure to meet the requirements
of 3.2.3.2 shall constitute failure of this test.
4.2.3.3 Integration. The shelter shall be examined to determine compliance
with 3.2.3.3. In addition, the shelter will be integrated with one or more of the
systems listed in Table IV (see 4.1). After the successful integration of the
shelter, threaded fasteners shall be tested. Test fixtures shall be fashioned to
evaluate the shelter's ability to securely hold threaded fasteners (10-32 through
1/2-20 bolts). The test fixtures shall be fashioned to induce only a twisting
load to the shelter attachment point for the torque test and, primarily, only an
axial tensile load through the centerline of the shelter attachment point for the
pull-out test. Reaction forces applied by the pull-out test fixture onto the
shelter surface shall be outside a three inch (3) radius measured from the center
line of the fastener being tested. Failure to meet the requirements of 3.2.3.3
shall constitute failure of this test.
4.2.3.3.1 Torque. To determine compliance, a torque load equal to 8 ft-lb for
the 10-32 bolt and 10 ft-lb for the other bolts shall be applied to two identical
fasteners of each size (1 horizontal , 1 vertical) installed in the shelter,
fasteners used to integrate the system (see 4.2.3.3) should be used where
possible. Failure to meet the torque requirements of 3.2.3.3 shall constitute
failure of this test.
4.2.3.3.2 Pull-out. To determine compliance, a tensile load equal to 800 lbs
for the 10-32 bolt and 1000 lbs for the other bolts shall be applied to two
identical fasteners of each size (1 horizontal, 1 vertical) installed in the
shelter, fasteners used to integrate the system (see 4.2.3.3) should be used where
possible. Failure of meet the pullout requirements of 3.2.3.3 shall constitute
failure of this test.
4.2.4 Chemical and biological (CB) resistance.
To determine compliance with
the requirements of 3.2.4, it shall be verified that the shelter is finished in
accordance with MIL-T-704 types F or G, or that the finish meets the test methods
(or equivalent) in MIL-T-704 types F or G.
4.2.5 Pressurization. Air shall be supplied to the shelter, in operational
configuration, with all appropriate openings closed, and an internal pressure of
1.2 inch water gauge shall be obtained and maintained. The air pressure and air
flow shall be stabilized. Any additional air supplied to maintain specified
internal pressure shall be recorded to determine compliance with 3.2.5. The Type
II shelter shall have the ventilation port opened and the internal pressure
reduced to .75 iwg and maintained. The air pressure and air flow shall be
stabilized. Any additional air supplied to maintain specified internal pressure
shall be recorded. Failure to meet the requirements of 3.2.5 shall constitute
failure of this test.
4.2.5.1 Ventilation port. The ventilation port shall be inspected. Failure to
meet the requirements of 3.2.5.1 shall constitute failure of this test.
4.2.6 Roof loads. The shelter roof shall be subjected to a uniform load of 40
2
pounds per square foot (lb/ft ) over the entire surface. After removal of the
uniform load, a 660 lb load over a 1 ft x 2 ft area at the weakest area of the
roof shall be applied. Each test shall be for a duration of 5 minutes. Failure
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