MIL-PRF-71168A(AR)
subjected to a 10-day temperature/humidity cycle.
3.7.7 Sand and dust. The cartridge shall be safe to fire
(no critical defects as defined in Table VI) after being
subjected to sand and dust conditions.
3.7.8 Salt spray (fog) exposure. The cartridge shall be
safe to store and fire (no critical defects as defined in Table
VI) after being subjected to a 5 percent salt spray (fog).
3.7.9 Hot chamber effects (cook off). A cartridge inserted
into the chamber of the M60 and M240B machine guns following the
firing of 200 cartridges in each weapon shall not fire (cook
off). In addition, the cartridge shall not deform to the extent
that clearing of the weapons is made difficult.
3.7.10 Attitude. The cartridge shall be safe to fire in the
M60 and M240B machine guns (no critical defect as defined in
Table VI) and the reliability shall not degrade by more than ten
percent (see 6.7.2) when fired at elevations between ± 85°.
3.7.11 Barrel erosion. The life of each of the 3 barrels
shall not be less than 5,000 rounds. The barrel life shall be
considered as having ended when any one of the following
conditions take place (whichever comes first):
a. The average velocity of an individual burst in the test
drops 61 meters/sec or more with respect to that of the
initial burst in the barrel's history.
b. When the bullets from twenty percent or more of the
cartridges in any burst show keyholing, which is defined
as yaw exceeding 15° at 25.4 meters range.
3.7.12 Demilitarization. The Small Arms Technical Manual (DMWR
9-1300-0017-D1) shall be followed for demilitarization
procedures. The item design shall ensure that the materials
specified and the assembly methods chosen allow for an
environmentally safe and cost effective demilitarization process,
not to exceed 10 percent of the item's manufacturing cost. The
design should allow maximum recovery of valuable materials and
components or when recovery is not feasible, require methods of
destruction with no environmental impact. The use of materials
containing Environmental Protection Agency (EPA) designated
hazardous materials shall be avoided. Open burning and open
detonation are no longer considered desirable demilitarization
methods and shall not be employed.
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