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| MIL-C-46941A
4.7.8.1 Primer sensitivity. A quantity of cartridges, in accordance with table I, void of
igniter and propellant, from the first article sample and each subsequent lot shall be tested for
sensitivity. In the event loaded cartridges are selected for test, remove and discard all powder
charges from the test cartridge by sectioning the cartridge case around the periphery. Drop test
at 15 inches (adjusted) using a steel ball weighing 3.94 0.02 ounces, in a primer sensitivity
machine with a cartridge holder approved by the acquiring agency. The height of 15 inches shall
be adjusted taking into consideration the actual weight of the ball so that the energy level
specified in 3.6.1 is achieved. Failure of the sample to comply with 3.6.1 shall be cause for
rejection of the sample or the lot.
4.7.8.2 Ballistics.
4.7.8.2.1 First article. Twenty-one cartridges of the first article sample shall be grouped
and temperature conditioned as described in table II and 4.8. Following removal from the
conditioning chamber, the cartridge shall be tested as required by 3.6.2.2. Failure of any
cartridge to comply with 3.6.2.2 shall be cause for sample rejection.
4.7.8.2.2 Production lot acceptance. Twenty-one assembled cartridges from each production
lot shall be loaded into acceptable M16 Thrusters, divided into three equal groups, temperature
conditioned, and fired in accordance with 3.6.2.2. Failure of any cartridge to comply with
3.6.2.2 shall be cause for rejection of the lot. In addition to the sample of cartridges for the
above test, 10 additional cartridges shall be furnished from each production lot for investigative
purposes.
4.7.8.2.2.1 Sealant application. Five cartridges from each production lot shall be selected
for this test. The cartridge shall be disassembled in such a manner that determination can be made
that the sealant has been applied for the full length of the joining surfaces at the junction of
the cartridge head and case sidewall and that the propellant cavity is free of sealant. Failure
of any cartridge to comply with the drawing requirements shall be cause for rejection of the lot
of cartridges.
4.7.8.3 Retest. There shall be no retests.
4.7.8.3.1 Test failure. If a test failure is attributable to an assignable cause, excluding
the test cartridge, the original test results shall be discarded and that test reconducted.
4.8 Temperature conditioning. The conditioning chamber shall be preconditioned to the
specified temperature. Once the temperature inside the chamber hasstabilized,the samples shall
be placed inside and maintained at the specified temperature for 4 hours minimum, 24 hours
maximum.
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