MIL-DTL-0048684B
4.5 Methods of inspections.
4.5.1 Primer
4.5.1.1 Check test for deterioration of primers. If the total time between original
acceptance of any lot and the assembly of that lot into the cartridge exceeds two years, or
if the primers have been subjected to adverse conditions, however, brief, at any time
since previous tests, the primer lot shall be subjected to and must satisfactorily pass the
check test for deterioration specified in MIL-P-60942 immediately before the primer lot
is assembled into the cartridge. The test shall be performed at the facility assembling the
primers into the cartridge.
4.5.2 Propellant weight. The propellant quantity shall be determined and then
weighed 100 percent. Any charge that fails to comply with the drawing requirement
(taking into account machine accuracy) shall be classified defective and removed from
the lot. The accuracy of the machine shall be determined and the prove-out test
performed to validate the machine's ability to remove charges outside of the drawing
tolerance range. The machine must be capable of detecting and rejecting critical
propellant weights, such that the end-product contains less than 1 in a million critical
defects (examples machine error rate not to exceed 1/500 and maximum defect rate not to
exceed 0.05 percent).
4.5.3 Security of crimp of base plug and action time. The cartridge assemblies
shall be assembled to a projectile and fired from a M129 Grenade Launcher. After firing,
observation shall be made for base plug movement and action time. If any base plug
movement or action time exceeds the applicable requirement, or any projectile lodges in
the bore the quantity represented shall be rejected and set aside for disposition in
accordance with MIL-STD-1916. The movement of the base plug shall be measured from
the highest point on the base plug to a point on the cartridge case directly beside it. The
cartridge case assemblies produced by each primer assembly machine shall be kept
segregated and identified. They shall not be used in production until successful
completion of this test.
4.5.4 X-ray or fluoroscopic examination of projectile assemblies. Prior to
assembly to the cartridge case assembly, the projectile assembly shall be inspected for
critical and major defects using approved x-ray or fluoroscopic equipment. The test shall
be conducted in two (2) planes. One shall be from the top of the projectile down and the
other from the side. The test shall be conducted in accordance with ASTM E1255.
4.5.5 X-ray examination of ballistic sample. Prior to ballistic testing, the
cartridges shall be inspected for defects using approved x-ray equipment. This test shall
be conducted in two planes: from the top of the projectile down and from the side. If any
critical defect is found, the lot shall be rejected including the ballistic sample. The test
shall be conducted in accordance with ASTM E1255.
4.5.6 Air pressure. The cartridge assembly shall be placed in an approved fixture
and a measured quantity of air shall be applied to produce the required air pressure.
Observations shall be made for a drop in pressure indicating a leak. This is a
non-destructive test. Parts successfully tested may be returned to the lot.
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