MIL-PRF-71168A(AR)
3.6.5 Residual stress. The cartridge shall not split when
subjected to residual stress for the applicable materials.
3.7 Environmental requirements. Each cartridge shall
operate without evidence of cracking, distortion, or damage that
may impair its intended operation or loss of performance, under
the following environmental conditions.
3.7.1 Waterproofness. The cartridges after submersion in
21°C ± 1°C water for 2 hours shall maintain its functional
reliability in the M60 and M240B machine gun. The mean velocity
obtained shall not vary by more than ± 30 m/s from the velocity
at 21°C ± 1°C (see 3.6.2).
3.7.2 Sequential rough handling. The cartridge shall be
capable of withstanding the following rigors of rough handling
and transportation:
a.
Secured-cargo vibration test
b.
loose cargo test
c.
2.13 meter drop test
d.
12.20 meter drop test
3.7.3 Long term high temperature storage. The cartridge
shall be safe to store and fire (no critical defects as defined
in Table VI) after being subjected to 30 days of continuous
heating at 63°C ± 1°C. The reliability of the cartridge (when
compared with the reliability obtained at ambient temperature's
function and casualty testing for the requirement in 3.6.1) shall
not degrade by more than 5 percent (see 6.7.2) and the cyclic
rate shall not change by more than 15 percent when the cartridge
is subjected to continuous heating.
3.7.4 Long term low temperature storage. The cartridge shall
be safe to store and fire (no critical defects as defined in
Table V) after being subjected to 30 days continuous cooling at
-35°C ± 1°C. The reliability of the cartridge (when compared
with the reliability obtained at ambient temperature's function
and casualty testing for the requirement in 3.6.1) shall not
degrade by more than 5 percent (see 6.7.2) and the cyclic rate
shall not change by more than 15 percent when the cartridge is
subjected to continuous cooling.
3.7.5 Thermal shock. The cartridge shall exhibit no evidence
of corrosion and shall function in the M60 and M240B machine gun,
after exposure to alternately high and low temperature extremes.
3.7.6 Temperature humidity. The cartridge shall be safe to
fire (no critical defects as defined in Table VI) after being
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